X Benchmarks + plot for Fannkuch 11

See https://github.com/golang/go/issues/18977 for context.

src/testing/testing.go

@@ -442,6 +442,7 @@ func (c *common) Fail() {
 	defer c.mu.Unlock()
 	// c.done needs to be locked to synchronize checks to c.done in parent tests.
 	if c.done {
+		zzz()
 		panic("Fail in goroutine after " + c.name + " has completed")
 	}
 	c.failed = true

test/bench/go1/.gitignore

+go1.test

test/bench/go1/fannkuch-entryshifted

+#!/bin/bash -e
+# compile/run Fannkuch11 benchmark with fannkuch() entry point shifted by various N
+
+# shiftby n shiftfile
+# makes fannkuch entrypoint to be shifted by ~ n*16 bytes
+shiftby() {
+	n=$1
+	out=$2
+	echo "package testing"		>$out
+	echo				>>$out
+	echo "// shifting by ~ $n·16"	>>$out
+	echo "func zzz() {"		>>$out
+	for i in `seq $n`; do
+		echo -e "\tprintln()"	>>$out
+	done
+	echo "}"			>>$out
+}
+
+
+# benchit go name shiftfile
+benchit() {
+	go=$1
+	name=$2
+	shiftfile=$3
+
+	for i in `seq 0 32`; do
+		echo "@$i"
+		shiftby $i $shiftfile
+		out=$name/`printf %04d $i`
+		mkdir -p $out
+		$go test -c -o $out/go1.test
+
+		$go tool objdump -s fannkuch $out/go1.test 2>/dev/null |head -2 | tail -1 |tee $out/entry.txt
+
+		$out/go1.test -test.run=Bench -test.bench=Fannkuch11 -test.count=5 |tee $out/bench.txt
+	done
+}
+
+
+#benchit go18 go18			../../../src/testing/zzz.go
+benchit go go-4b0d74f8			../../../../go/src/testing/zzz.go
+#benchit go go-4b0d74f8+cl43491.3	../../../../go/src/testing/zzz.go

test/bench/go1/go-4b0d74f8+cl43491.3/0000/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2918436214 ns/op
+BenchmarkFannkuch11-4   	       1	2900622300 ns/op
+BenchmarkFannkuch11-4   	       1	2901749082 ns/op
+BenchmarkFannkuch11-4   	       1	2940830409 ns/op
+BenchmarkFannkuch11-4   	       1	2912478121 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0000/entry.txt

+  fannkuch_test.go:12	0x75f0a0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0001/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2910932249 ns/op
+BenchmarkFannkuch11-4   	       1	2917028086 ns/op
+BenchmarkFannkuch11-4   	       1	2911561535 ns/op
+BenchmarkFannkuch11-4   	       1	2906550483 ns/op
+BenchmarkFannkuch11-4   	       1	2914845415 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0001/entry.txt

+  fannkuch_test.go:12	0x75f0c0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0002/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2969279548 ns/op
+BenchmarkFannkuch11-4   	       1	2982046012 ns/op
+BenchmarkFannkuch11-4   	       1	2968881122 ns/op
+BenchmarkFannkuch11-4   	       1	2969440498 ns/op
+BenchmarkFannkuch11-4   	       1	2972453916 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0002/entry.txt

+  fannkuch_test.go:12	0x75f0d0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0003/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2899131835 ns/op
+BenchmarkFannkuch11-4   	       1	2898111879 ns/op
+BenchmarkFannkuch11-4   	       1	2898821692 ns/op
+BenchmarkFannkuch11-4   	       1	2901318488 ns/op
+BenchmarkFannkuch11-4   	       1	2902301351 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0003/entry.txt

+  fannkuch_test.go:12	0x75f0e0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0004/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	3187864273 ns/op
+BenchmarkFannkuch11-4   	       1	3157959997 ns/op
+BenchmarkFannkuch11-4   	       1	3170501573 ns/op
+BenchmarkFannkuch11-4   	       1	3181285380 ns/op
+BenchmarkFannkuch11-4   	       1	3184053028 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0004/entry.txt

+  fannkuch_test.go:12	0x75f0f0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0005/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	3160267313 ns/op
+BenchmarkFannkuch11-4   	       1	3166786529 ns/op
+BenchmarkFannkuch11-4   	       1	3159912207 ns/op
+BenchmarkFannkuch11-4   	       1	3166717417 ns/op
+BenchmarkFannkuch11-4   	       1	3173389835 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0005/entry.txt

+  fannkuch_test.go:12	0x75f0f0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0006/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2917219766 ns/op
+BenchmarkFannkuch11-4   	       1	2912608548 ns/op
+BenchmarkFannkuch11-4   	       1	2926319633 ns/op
+BenchmarkFannkuch11-4   	       1	2904263281 ns/op
+BenchmarkFannkuch11-4   	       1	2903771227 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0006/entry.txt

+  fannkuch_test.go:12	0x75f100		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0007/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2981027970 ns/op
+BenchmarkFannkuch11-4   	       1	2980660016 ns/op
+BenchmarkFannkuch11-4   	       1	2980530272 ns/op
+BenchmarkFannkuch11-4   	       1	3007247593 ns/op
+BenchmarkFannkuch11-4   	       1	2976470502 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0007/entry.txt

+  fannkuch_test.go:12	0x75f110		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0008/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2895980630 ns/op
+BenchmarkFannkuch11-4   	       1	2898159941 ns/op
+BenchmarkFannkuch11-4   	       1	2892238889 ns/op
+BenchmarkFannkuch11-4   	       1	2893411950 ns/op
+BenchmarkFannkuch11-4   	       1	2893053332 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0008/entry.txt

+  fannkuch_test.go:12	0x75f120		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0009/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	3199979861 ns/op
+BenchmarkFannkuch11-4   	       1	3204897050 ns/op
+BenchmarkFannkuch11-4   	       1	3197973361 ns/op
+BenchmarkFannkuch11-4   	       1	3196750954 ns/op
+BenchmarkFannkuch11-4   	       1	3196557217 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0009/entry.txt

+  fannkuch_test.go:12	0x75f130		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0010/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2898708638 ns/op
+BenchmarkFannkuch11-4   	       1	2926887169 ns/op
+BenchmarkFannkuch11-4   	       1	2951930047 ns/op
+BenchmarkFannkuch11-4   	       1	2951991342 ns/op
+BenchmarkFannkuch11-4   	       1	2955148727 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0010/entry.txt

+  fannkuch_test.go:12	0x75f140		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0011/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2978927780 ns/op
+BenchmarkFannkuch11-4   	       1	2975175040 ns/op
+BenchmarkFannkuch11-4   	       1	3005095704 ns/op
+BenchmarkFannkuch11-4   	       1	2962754892 ns/op
+BenchmarkFannkuch11-4   	       1	2965871016 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0011/entry.txt

+  fannkuch_test.go:12	0x75f150		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0012/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2896687033 ns/op
+BenchmarkFannkuch11-4   	       1	2895414812 ns/op
+BenchmarkFannkuch11-4   	       1	2936742828 ns/op
+BenchmarkFannkuch11-4   	       1	2894991702 ns/op
+BenchmarkFannkuch11-4   	       1	2898672409 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0012/entry.txt

+  fannkuch_test.go:12	0x75f160		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0013/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2969497580 ns/op
+BenchmarkFannkuch11-4   	       1	2971730578 ns/op
+BenchmarkFannkuch11-4   	       1	2957126679 ns/op
+BenchmarkFannkuch11-4   	       1	2970083017 ns/op
+BenchmarkFannkuch11-4   	       1	2969750664 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0013/entry.txt

+  fannkuch_test.go:12	0x75f170		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0014/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2937377059 ns/op
+BenchmarkFannkuch11-4   	       1	2932927018 ns/op
+BenchmarkFannkuch11-4   	       1	2946572249 ns/op
+BenchmarkFannkuch11-4   	       1	2976339923 ns/op
+BenchmarkFannkuch11-4   	       1	2973225335 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0014/entry.txt

+  fannkuch_test.go:12	0x75f180		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0015/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2984930442 ns/op
+BenchmarkFannkuch11-4   	       1	2984748318 ns/op
+BenchmarkFannkuch11-4   	       1	2981730583 ns/op
+BenchmarkFannkuch11-4   	       1	2973675938 ns/op
+BenchmarkFannkuch11-4   	       1	2994923868 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0015/entry.txt

+  fannkuch_test.go:12	0x75f190		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0016/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2929176521 ns/op
+BenchmarkFannkuch11-4   	       1	2913532526 ns/op
+BenchmarkFannkuch11-4   	       1	2973457484 ns/op
+BenchmarkFannkuch11-4   	       1	2902495334 ns/op
+BenchmarkFannkuch11-4   	       1	2932511322 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0016/entry.txt

+  fannkuch_test.go:12	0x75f1a0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0017/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2971671145 ns/op
+BenchmarkFannkuch11-4   	       1	2966759185 ns/op
+BenchmarkFannkuch11-4   	       1	2957540067 ns/op
+BenchmarkFannkuch11-4   	       1	2966356886 ns/op
+BenchmarkFannkuch11-4   	       1	2967177639 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0017/entry.txt

+  fannkuch_test.go:12	0x75f1b0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0018/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2910062202 ns/op
+BenchmarkFannkuch11-4   	       1	2914911477 ns/op
+BenchmarkFannkuch11-4   	       1	2896082928 ns/op
+BenchmarkFannkuch11-4   	       1	2910682055 ns/op
+BenchmarkFannkuch11-4   	       1	2936942068 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0018/entry.txt

+  fannkuch_test.go:12	0x75f1c0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0019/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2976725760 ns/op
+BenchmarkFannkuch11-4   	       1	2975062828 ns/op
+BenchmarkFannkuch11-4   	       1	3007592984 ns/op
+BenchmarkFannkuch11-4   	       1	2982302518 ns/op
+BenchmarkFannkuch11-4   	       1	2976944205 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0019/entry.txt

+  fannkuch_test.go:12	0x75f1d0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0020/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2908567988 ns/op
+BenchmarkFannkuch11-4   	       1	2889760201 ns/op
+BenchmarkFannkuch11-4   	       1	2905272323 ns/op
+BenchmarkFannkuch11-4   	       1	2905559271 ns/op
+BenchmarkFannkuch11-4   	       1	2900593896 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0020/entry.txt

+  fannkuch_test.go:12	0x75f1e0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0021/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2927760909 ns/op
+BenchmarkFannkuch11-4   	       1	2909095244 ns/op
+BenchmarkFannkuch11-4   	       1	2900876425 ns/op
+BenchmarkFannkuch11-4   	       1	2894049671 ns/op
+BenchmarkFannkuch11-4   	       1	2919675164 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0021/entry.txt

+  fannkuch_test.go:12	0x75f1e0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0022/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	3196107859 ns/op
+BenchmarkFannkuch11-4   	       1	3195859183 ns/op
+BenchmarkFannkuch11-4   	       1	3188823584 ns/op
+BenchmarkFannkuch11-4   	       1	3200426724 ns/op
+BenchmarkFannkuch11-4   	       1	3185179596 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0022/entry.txt

+  fannkuch_test.go:12	0x75f1f0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0023/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2897050417 ns/op
+BenchmarkFannkuch11-4   	       1	2901809167 ns/op
+BenchmarkFannkuch11-4   	       1	2889645754 ns/op
+BenchmarkFannkuch11-4   	       1	2900429305 ns/op
+BenchmarkFannkuch11-4   	       1	2932811046 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0023/entry.txt

+  fannkuch_test.go:12	0x75f200		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0024/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2974710118 ns/op
+BenchmarkFannkuch11-4   	       1	2979019304 ns/op
+BenchmarkFannkuch11-4   	       1	2992623409 ns/op
+BenchmarkFannkuch11-4   	       1	3004464307 ns/op
+BenchmarkFannkuch11-4   	       1	2982677048 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0024/entry.txt

+  fannkuch_test.go:12	0x75f210		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0025/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2903064033 ns/op
+BenchmarkFannkuch11-4   	       1	2880045453 ns/op
+BenchmarkFannkuch11-4   	       1	2886469797 ns/op
+BenchmarkFannkuch11-4   	       1	2890022591 ns/op
+BenchmarkFannkuch11-4   	       1	2884570198 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0025/entry.txt

+  fannkuch_test.go:12	0x75f220		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0026/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	3218254762 ns/op
+BenchmarkFannkuch11-4   	       1	3226318363 ns/op
+BenchmarkFannkuch11-4   	       1	3222877165 ns/op
+BenchmarkFannkuch11-4   	       1	3221487957 ns/op
+BenchmarkFannkuch11-4   	       1	3229588709 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0026/entry.txt

+  fannkuch_test.go:12	0x75f230		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0027/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2907254953 ns/op
+BenchmarkFannkuch11-4   	       1	2905373511 ns/op
+BenchmarkFannkuch11-4   	       1	2906329692 ns/op
+BenchmarkFannkuch11-4   	       1	2913144944 ns/op
+BenchmarkFannkuch11-4   	       1	2909097649 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0027/entry.txt

+  fannkuch_test.go:12	0x75f240		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0028/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2973946051 ns/op
+BenchmarkFannkuch11-4   	       1	2970301654 ns/op
+BenchmarkFannkuch11-4   	       1	2961103720 ns/op
+BenchmarkFannkuch11-4   	       1	2987705081 ns/op
+BenchmarkFannkuch11-4   	       1	2992736424 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0028/entry.txt

+  fannkuch_test.go:12	0x75f250		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0029/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2895340083 ns/op
+BenchmarkFannkuch11-4   	       1	2894641118 ns/op
+BenchmarkFannkuch11-4   	       1	2895871997 ns/op
+BenchmarkFannkuch11-4   	       1	2899767962 ns/op
+BenchmarkFannkuch11-4   	       1	2892486994 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0029/entry.txt

+  fannkuch_test.go:12	0x75f260		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0030/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2972379488 ns/op
+BenchmarkFannkuch11-4   	       1	2979657151 ns/op
+BenchmarkFannkuch11-4   	       1	2990920763 ns/op
+BenchmarkFannkuch11-4   	       1	2976374396 ns/op
+BenchmarkFannkuch11-4   	       1	2983636143 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0030/entry.txt

+  fannkuch_test.go:12	0x75f270		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0031/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2925643768 ns/op
+BenchmarkFannkuch11-4   	       1	2937395024 ns/op
+BenchmarkFannkuch11-4   	       1	2929494060 ns/op
+BenchmarkFannkuch11-4   	       1	2924534360 ns/op
+BenchmarkFannkuch11-4   	       1	2976600260 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0031/entry.txt

+  fannkuch_test.go:12	0x75f280		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8+cl43491.3/0032/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	3011316057 ns/op
+BenchmarkFannkuch11-4   	       1	2985688209 ns/op
+BenchmarkFannkuch11-4   	       1	2979548202 ns/op
+BenchmarkFannkuch11-4   	       1	3023891223 ns/op
+BenchmarkFannkuch11-4   	       1	2987030504 ns/op
+PASS

test/bench/go1/go-4b0d74f8+cl43491.3/0032/entry.txt

+  fannkuch_test.go:12	0x75f290		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0000/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2786354969 ns/op
+BenchmarkFannkuch11-4   	       1	2795275294 ns/op
+BenchmarkFannkuch11-4   	       1	2794738310 ns/op
+BenchmarkFannkuch11-4   	       1	2790130512 ns/op
+BenchmarkFannkuch11-4   	       1	2793541039 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0000/entry.txt

+  fannkuch_test.go:12	0x75fdd0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0001/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2780707681 ns/op
+BenchmarkFannkuch11-4   	       1	2780152991 ns/op
+BenchmarkFannkuch11-4   	       1	2785385985 ns/op
+BenchmarkFannkuch11-4   	       1	2791216058 ns/op
+BenchmarkFannkuch11-4   	       1	2783350347 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0001/entry.txt

+  fannkuch_test.go:12	0x75fdf0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0002/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2833356065 ns/op
+BenchmarkFannkuch11-4   	       1	2847146732 ns/op
+BenchmarkFannkuch11-4   	       1	2834043475 ns/op
+BenchmarkFannkuch11-4   	       1	2841449834 ns/op
+BenchmarkFannkuch11-4   	       1	2841662567 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0002/entry.txt

+  fannkuch_test.go:12	0x75fe00		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0003/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2788504361 ns/op
+BenchmarkFannkuch11-4   	       1	2809629356 ns/op
+BenchmarkFannkuch11-4   	       1	2787783506 ns/op
+BenchmarkFannkuch11-4   	       1	2798952407 ns/op
+BenchmarkFannkuch11-4   	       1	2793861985 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0003/entry.txt

+  fannkuch_test.go:12	0x75fe10		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0004/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2888618798 ns/op
+BenchmarkFannkuch11-4   	       1	2886051141 ns/op
+BenchmarkFannkuch11-4   	       1	2877131596 ns/op
+BenchmarkFannkuch11-4   	       1	2884219690 ns/op
+BenchmarkFannkuch11-4   	       1	2886633384 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0004/entry.txt

+  fannkuch_test.go:12	0x75fe20		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0005/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2885210377 ns/op
+BenchmarkFannkuch11-4   	       1	2884819497 ns/op
+BenchmarkFannkuch11-4   	       1	2885108372 ns/op
+BenchmarkFannkuch11-4   	       1	2882805254 ns/op
+BenchmarkFannkuch11-4   	       1	2886113494 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0005/entry.txt

+  fannkuch_test.go:12	0x75fe20		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0006/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2791775737 ns/op
+BenchmarkFannkuch11-4   	       1	2781333251 ns/op
+BenchmarkFannkuch11-4   	       1	2812540270 ns/op
+BenchmarkFannkuch11-4   	       1	2788504984 ns/op
+BenchmarkFannkuch11-4   	       1	2782203630 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0006/entry.txt

+  fannkuch_test.go:12	0x75fe30		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0007/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2831376384 ns/op
+BenchmarkFannkuch11-4   	       1	2812827485 ns/op
+BenchmarkFannkuch11-4   	       1	2814649422 ns/op
+BenchmarkFannkuch11-4   	       1	2810927789 ns/op
+BenchmarkFannkuch11-4   	       1	2837558438 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0007/entry.txt

+  fannkuch_test.go:12	0x75fe40		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0008/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2795853760 ns/op
+BenchmarkFannkuch11-4   	       1	2797204622 ns/op
+BenchmarkFannkuch11-4   	       1	2828225217 ns/op
+BenchmarkFannkuch11-4   	       1	2792904347 ns/op
+BenchmarkFannkuch11-4   	       1	2793934777 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0008/entry.txt

+  fannkuch_test.go:12	0x75fe50		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0009/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2888767327 ns/op
+BenchmarkFannkuch11-4   	       1	2888508441 ns/op
+BenchmarkFannkuch11-4   	       1	2886122707 ns/op
+BenchmarkFannkuch11-4   	       1	2884470963 ns/op
+BenchmarkFannkuch11-4   	       1	2889014444 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0009/entry.txt

+  fannkuch_test.go:12	0x75fe60		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0010/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	3002530458 ns/op
+BenchmarkFannkuch11-4   	       1	3005790466 ns/op
+BenchmarkFannkuch11-4   	       1	3010252938 ns/op
+BenchmarkFannkuch11-4   	       1	3006637038 ns/op
+BenchmarkFannkuch11-4   	       1	3000309886 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0010/entry.txt

+  fannkuch_test.go:12	0x75fe70		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0011/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2834043150 ns/op
+BenchmarkFannkuch11-4   	       1	2837645567 ns/op
+BenchmarkFannkuch11-4   	       1	2834813403 ns/op
+BenchmarkFannkuch11-4   	       1	2840732873 ns/op
+BenchmarkFannkuch11-4   	       1	2837065841 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0011/entry.txt

+  fannkuch_test.go:12	0x75fe80		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0012/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2994328072 ns/op
+BenchmarkFannkuch11-4   	       1	2982622704 ns/op
+BenchmarkFannkuch11-4   	       1	2987348373 ns/op
+BenchmarkFannkuch11-4   	       1	2993663893 ns/op
+BenchmarkFannkuch11-4   	       1	3001205192 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0012/entry.txt

+  fannkuch_test.go:12	0x75fe90		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0013/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2898949568 ns/op
+BenchmarkFannkuch11-4   	       1	2892745759 ns/op
+BenchmarkFannkuch11-4   	       1	2892382691 ns/op
+BenchmarkFannkuch11-4   	       1	2914229556 ns/op
+BenchmarkFannkuch11-4   	       1	2891773429 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0013/entry.txt

+  fannkuch_test.go:12	0x75fea0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0014/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2807318915 ns/op
+BenchmarkFannkuch11-4   	       1	2802974323 ns/op
+BenchmarkFannkuch11-4   	       1	2793264194 ns/op
+BenchmarkFannkuch11-4   	       1	2828864858 ns/op
+BenchmarkFannkuch11-4   	       1	2806454663 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0014/entry.txt

+  fannkuch_test.go:12	0x75feb0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0015/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2808554364 ns/op
+BenchmarkFannkuch11-4   	       1	2824698386 ns/op
+BenchmarkFannkuch11-4   	       1	2805398295 ns/op
+BenchmarkFannkuch11-4   	       1	2812441292 ns/op
+BenchmarkFannkuch11-4   	       1	2807817575 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0015/entry.txt

+  fannkuch_test.go:12	0x75fec0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0016/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2773446695 ns/op
+BenchmarkFannkuch11-4   	       1	2788598478 ns/op
+BenchmarkFannkuch11-4   	       1	2780489493 ns/op
+BenchmarkFannkuch11-4   	       1	2776002936 ns/op
+BenchmarkFannkuch11-4   	       1	2778423052 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0016/entry.txt

+  fannkuch_test.go:12	0x75fed0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0017/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2878128703 ns/op
+BenchmarkFannkuch11-4   	       1	2878855807 ns/op
+BenchmarkFannkuch11-4   	       1	2892681511 ns/op
+BenchmarkFannkuch11-4   	       1	2868704963 ns/op
+BenchmarkFannkuch11-4   	       1	2870318767 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0017/entry.txt

+  fannkuch_test.go:12	0x75fee0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0018/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2973052290 ns/op
+BenchmarkFannkuch11-4   	       1	2969733444 ns/op
+BenchmarkFannkuch11-4   	       1	3003894593 ns/op
+BenchmarkFannkuch11-4   	       1	2997363188 ns/op
+BenchmarkFannkuch11-4   	       1	2964254641 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0018/entry.txt

+  fannkuch_test.go:12	0x75fef0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0019/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2813210809 ns/op
+BenchmarkFannkuch11-4   	       1	2830426276 ns/op
+BenchmarkFannkuch11-4   	       1	2824984394 ns/op
+BenchmarkFannkuch11-4   	       1	2810945167 ns/op
+BenchmarkFannkuch11-4   	       1	2866198993 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0019/entry.txt

+  fannkuch_test.go:12	0x75ff00		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0020/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2983263162 ns/op
+BenchmarkFannkuch11-4   	       1	2987827745 ns/op
+BenchmarkFannkuch11-4   	       1	2987236038 ns/op
+BenchmarkFannkuch11-4   	       1	2989862494 ns/op
+BenchmarkFannkuch11-4   	       1	2974309250 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0020/entry.txt

+  fannkuch_test.go:12	0x75ff10		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0021/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2980225574 ns/op
+BenchmarkFannkuch11-4   	       1	2976998127 ns/op
+BenchmarkFannkuch11-4   	       1	3010044068 ns/op
+BenchmarkFannkuch11-4   	       1	3005035629 ns/op
+BenchmarkFannkuch11-4   	       1	3007159596 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0021/entry.txt

+  fannkuch_test.go:12	0x75ff10		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0022/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2898068423 ns/op
+BenchmarkFannkuch11-4   	       1	2884816980 ns/op
+BenchmarkFannkuch11-4   	       1	2874595490 ns/op
+BenchmarkFannkuch11-4   	       1	2876932903 ns/op
+BenchmarkFannkuch11-4   	       1	2872122288 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0022/entry.txt

+  fannkuch_test.go:12	0x75ff20		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0023/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2755858145 ns/op
+BenchmarkFannkuch11-4   	       1	2790461378 ns/op
+BenchmarkFannkuch11-4   	       1	2775122364 ns/op
+BenchmarkFannkuch11-4   	       1	2753832177 ns/op
+BenchmarkFannkuch11-4   	       1	2750269994 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0023/entry.txt

+  fannkuch_test.go:12	0x75ff30		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0024/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2855927143 ns/op
+BenchmarkFannkuch11-4   	       1	2875087805 ns/op
+BenchmarkFannkuch11-4   	       1	2874328217 ns/op
+BenchmarkFannkuch11-4   	       1	2849572647 ns/op
+BenchmarkFannkuch11-4   	       1	2838823156 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0024/entry.txt

+  fannkuch_test.go:12	0x75ff40		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0025/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2779991615 ns/op
+BenchmarkFannkuch11-4   	       1	2801021742 ns/op
+BenchmarkFannkuch11-4   	       1	2803833311 ns/op
+BenchmarkFannkuch11-4   	       1	2774720627 ns/op
+BenchmarkFannkuch11-4   	       1	2778273374 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0025/entry.txt

+  fannkuch_test.go:12	0x75ff50		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0026/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2862304215 ns/op
+BenchmarkFannkuch11-4   	       1	2875595000 ns/op
+BenchmarkFannkuch11-4   	       1	2876063579 ns/op
+BenchmarkFannkuch11-4   	       1	2868261991 ns/op
+BenchmarkFannkuch11-4   	       1	2864887387 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0026/entry.txt

+  fannkuch_test.go:12	0x75ff60		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0027/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2963942449 ns/op
+BenchmarkFannkuch11-4   	       1	3001861223 ns/op
+BenchmarkFannkuch11-4   	       1	2967626390 ns/op
+BenchmarkFannkuch11-4   	       1	2997433667 ns/op
+BenchmarkFannkuch11-4   	       1	2999545951 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0027/entry.txt

+  fannkuch_test.go:12	0x75ff70		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0028/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2848441228 ns/op
+BenchmarkFannkuch11-4   	       1	2845642412 ns/op
+BenchmarkFannkuch11-4   	       1	2844337214 ns/op
+BenchmarkFannkuch11-4   	       1	2843422260 ns/op
+BenchmarkFannkuch11-4   	       1	2844777902 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0028/entry.txt

+  fannkuch_test.go:12	0x75ff80		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0029/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2979347281 ns/op
+BenchmarkFannkuch11-4   	       1	3006654620 ns/op
+BenchmarkFannkuch11-4   	       1	2981931666 ns/op
+BenchmarkFannkuch11-4   	       1	2981173153 ns/op
+BenchmarkFannkuch11-4   	       1	2978787612 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0029/entry.txt

+  fannkuch_test.go:12	0x75ff90		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0030/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2875173623 ns/op
+BenchmarkFannkuch11-4   	       1	2870295516 ns/op
+BenchmarkFannkuch11-4   	       1	2873426279 ns/op
+BenchmarkFannkuch11-4   	       1	2875135792 ns/op
+BenchmarkFannkuch11-4   	       1	2880939420 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0030/entry.txt

+  fannkuch_test.go:12	0x75ffa0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0031/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2766109041 ns/op
+BenchmarkFannkuch11-4   	       1	2795880887 ns/op
+BenchmarkFannkuch11-4   	       1	2785200797 ns/op
+BenchmarkFannkuch11-4   	       1	2797529499 ns/op
+BenchmarkFannkuch11-4   	       1	2797933213 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0031/entry.txt

+  fannkuch_test.go:12	0x75ffb0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go-4b0d74f8/0032/bench.txt

+goos: linux
+goarch: amd64
+BenchmarkFannkuch11-4   	       1	2816019202 ns/op
+BenchmarkFannkuch11-4   	       1	2823691299 ns/op
+BenchmarkFannkuch11-4   	       1	2811029910 ns/op
+BenchmarkFannkuch11-4   	       1	2841814699 ns/op
+BenchmarkFannkuch11-4   	       1	2814199212 ns/op
+PASS

test/bench/go1/go-4b0d74f8/0032/entry.txt

+  fannkuch_test.go:12	0x75ffc0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0000/bench.txt

+BenchmarkFannkuch11-4   	       1	2677347950 ns/op
+BenchmarkFannkuch11-4   	       1	2677009094 ns/op
+BenchmarkFannkuch11-4   	       1	2681190698 ns/op
+BenchmarkFannkuch11-4   	       1	2677890484 ns/op
+BenchmarkFannkuch11-4   	       1	2676524960 ns/op
+PASS

test/bench/go1/go18/0000/entry.txt

+  fannkuch_test.go:12	0x75f860		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0001/bench.txt

+BenchmarkFannkuch11-4   	       1	2829784284 ns/op
+BenchmarkFannkuch11-4   	       1	2829017327 ns/op
+BenchmarkFannkuch11-4   	       1	2827053361 ns/op
+BenchmarkFannkuch11-4   	       1	2827030975 ns/op
+BenchmarkFannkuch11-4   	       1	2828888922 ns/op
+PASS

test/bench/go1/go18/0001/entry.txt

+  fannkuch_test.go:12	0x75f870		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0002/bench.txt

+BenchmarkFannkuch11-4   	       1	2678614060 ns/op
+BenchmarkFannkuch11-4   	       1	2676482299 ns/op
+BenchmarkFannkuch11-4   	       1	2675611639 ns/op
+BenchmarkFannkuch11-4   	       1	2680247355 ns/op
+BenchmarkFannkuch11-4   	       1	2675814311 ns/op
+PASS

test/bench/go1/go18/0002/entry.txt

+  fannkuch_test.go:12	0x75f880		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0003/bench.txt

+BenchmarkFannkuch11-4   	       1	2706259014 ns/op
+BenchmarkFannkuch11-4   	       1	2712325327 ns/op
+BenchmarkFannkuch11-4   	       1	2709550770 ns/op
+BenchmarkFannkuch11-4   	       1	2710985996 ns/op
+BenchmarkFannkuch11-4   	       1	2734190436 ns/op
+PASS

test/bench/go1/go18/0003/entry.txt

+  fannkuch_test.go:12	0x75f890		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0004/bench.txt

+BenchmarkFannkuch11-4   	       1	2744992306 ns/op
+BenchmarkFannkuch11-4   	       1	2753648134 ns/op
+BenchmarkFannkuch11-4   	       1	2745242951 ns/op
+BenchmarkFannkuch11-4   	       1	2744036918 ns/op
+BenchmarkFannkuch11-4   	       1	2765028873 ns/op
+PASS

test/bench/go1/go18/0004/entry.txt

+  fannkuch_test.go:12	0x75f8a0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0005/bench.txt

+BenchmarkFannkuch11-4   	       1	2743914713 ns/op
+BenchmarkFannkuch11-4   	       1	2748093757 ns/op
+BenchmarkFannkuch11-4   	       1	2743394894 ns/op
+BenchmarkFannkuch11-4   	       1	2747232238 ns/op
+BenchmarkFannkuch11-4   	       1	2740626026 ns/op
+PASS

test/bench/go1/go18/0005/entry.txt

+  fannkuch_test.go:12	0x75f8b0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0006/bench.txt

+BenchmarkFannkuch11-4   	       1	2682383829 ns/op
+BenchmarkFannkuch11-4   	       1	2690935715 ns/op
+BenchmarkFannkuch11-4   	       1	2680613475 ns/op
+BenchmarkFannkuch11-4   	       1	2681347914 ns/op
+BenchmarkFannkuch11-4   	       1	2679227549 ns/op
+PASS

test/bench/go1/go18/0006/entry.txt

+  fannkuch_test.go:12	0x75f8c0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0007/bench.txt

+BenchmarkFannkuch11-4   	       1	2836753988 ns/op
+BenchmarkFannkuch11-4   	       1	2836215300 ns/op
+BenchmarkFannkuch11-4   	       1	2843581895 ns/op
+BenchmarkFannkuch11-4   	       1	2848538903 ns/op
+BenchmarkFannkuch11-4   	       1	2849106367 ns/op
+PASS

test/bench/go1/go18/0007/entry.txt

+  fannkuch_test.go:12	0x75f8d0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0008/bench.txt

+BenchmarkFannkuch11-4   	       1	2699820899 ns/op
+BenchmarkFannkuch11-4   	       1	2701618354 ns/op
+BenchmarkFannkuch11-4   	       1	2701699467 ns/op
+BenchmarkFannkuch11-4   	       1	2697150367 ns/op
+BenchmarkFannkuch11-4   	       1	2698327337 ns/op
+PASS

test/bench/go1/go18/0008/entry.txt

+  fannkuch_test.go:12	0x75f8e0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0009/bench.txt

+BenchmarkFannkuch11-4   	       1	2830791494 ns/op
+BenchmarkFannkuch11-4   	       1	2833784330 ns/op
+BenchmarkFannkuch11-4   	       1	2838477037 ns/op
+BenchmarkFannkuch11-4   	       1	2833745241 ns/op
+BenchmarkFannkuch11-4   	       1	2831950043 ns/op
+PASS

test/bench/go1/go18/0009/entry.txt

+  fannkuch_test.go:12	0x75f8f0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0010/bench.txt

+BenchmarkFannkuch11-4   	       1	2836152725 ns/op
+BenchmarkFannkuch11-4   	       1	2833605290 ns/op
+BenchmarkFannkuch11-4   	       1	2831541429 ns/op
+BenchmarkFannkuch11-4   	       1	2833052016 ns/op
+BenchmarkFannkuch11-4   	       1	2832597299 ns/op
+PASS

test/bench/go1/go18/0010/entry.txt

+  fannkuch_test.go:12	0x75f8f0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0011/bench.txt

+BenchmarkFannkuch11-4   	       1	2685197401 ns/op
+BenchmarkFannkuch11-4   	       1	2687087547 ns/op
+BenchmarkFannkuch11-4   	       1	2696768683 ns/op
+BenchmarkFannkuch11-4   	       1	2691181624 ns/op
+BenchmarkFannkuch11-4   	       1	2750406665 ns/op
+PASS

test/bench/go1/go18/0011/entry.txt

+  fannkuch_test.go:12	0x75f900		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0012/bench.txt

+BenchmarkFannkuch11-4   	       1	2702388457 ns/op
+BenchmarkFannkuch11-4   	       1	2696726927 ns/op
+BenchmarkFannkuch11-4   	       1	2698254563 ns/op
+BenchmarkFannkuch11-4   	       1	2697003723 ns/op
+BenchmarkFannkuch11-4   	       1	2695037233 ns/op
+PASS

test/bench/go1/go18/0012/entry.txt

+  fannkuch_test.go:12	0x75f910		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0013/bench.txt

+BenchmarkFannkuch11-4   	       1	2709914936 ns/op
+BenchmarkFannkuch11-4   	       1	2710902750 ns/op
+BenchmarkFannkuch11-4   	       1	2725414068 ns/op
+BenchmarkFannkuch11-4   	       1	2710702401 ns/op
+BenchmarkFannkuch11-4   	       1	2709285133 ns/op
+PASS

test/bench/go1/go18/0013/entry.txt

+  fannkuch_test.go:12	0x75f920		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0014/bench.txt

+BenchmarkFannkuch11-4   	       1	2731739857 ns/op
+BenchmarkFannkuch11-4   	       1	2734760133 ns/op
+BenchmarkFannkuch11-4   	       1	2731561663 ns/op
+BenchmarkFannkuch11-4   	       1	2754741973 ns/op
+BenchmarkFannkuch11-4   	       1	2771378213 ns/op
+PASS

test/bench/go1/go18/0014/entry.txt

+  fannkuch_test.go:12	0x75f930		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0015/bench.txt

+BenchmarkFannkuch11-4   	       1	2696525317 ns/op
+BenchmarkFannkuch11-4   	       1	2709770503 ns/op
+BenchmarkFannkuch11-4   	       1	2707177274 ns/op
+BenchmarkFannkuch11-4   	       1	2700560748 ns/op
+BenchmarkFannkuch11-4   	       1	2699984339 ns/op
+PASS

test/bench/go1/go18/0015/entry.txt

+  fannkuch_test.go:12	0x75f940		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0016/bench.txt

+BenchmarkFannkuch11-4   	       1	2872259214 ns/op
+BenchmarkFannkuch11-4   	       1	2871156777 ns/op
+BenchmarkFannkuch11-4   	       1	2871438686 ns/op
+BenchmarkFannkuch11-4   	       1	2871566773 ns/op
+BenchmarkFannkuch11-4   	       1	2872170015 ns/op
+PASS

test/bench/go1/go18/0016/entry.txt

+  fannkuch_test.go:12	0x75f950		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0017/bench.txt

+BenchmarkFannkuch11-4   	       1	2746391973 ns/op
+BenchmarkFannkuch11-4   	       1	2700392881 ns/op
+BenchmarkFannkuch11-4   	       1	2698300666 ns/op
+BenchmarkFannkuch11-4   	       1	2702552531 ns/op
+BenchmarkFannkuch11-4   	       1	2711696398 ns/op
+PASS

test/bench/go1/go18/0017/entry.txt

+  fannkuch_test.go:12	0x75f960		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0018/bench.txt

+BenchmarkFannkuch11-4   	       1	2823377657 ns/op
+BenchmarkFannkuch11-4   	       1	2833729470 ns/op
+BenchmarkFannkuch11-4   	       1	2836751566 ns/op
+BenchmarkFannkuch11-4   	       1	2832615331 ns/op
+BenchmarkFannkuch11-4   	       1	2838422556 ns/op
+PASS

test/bench/go1/go18/0018/entry.txt

+  fannkuch_test.go:12	0x75f970		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0019/bench.txt

+BenchmarkFannkuch11-4   	       1	2687647866 ns/op
+BenchmarkFannkuch11-4   	       1	2674633646 ns/op
+BenchmarkFannkuch11-4   	       1	2680646207 ns/op
+BenchmarkFannkuch11-4   	       1	2677446036 ns/op
+BenchmarkFannkuch11-4   	       1	2675928982 ns/op
+PASS

test/bench/go1/go18/0019/entry.txt

+  fannkuch_test.go:12	0x75f980		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0020/bench.txt

+BenchmarkFannkuch11-4   	       1	2718860519 ns/op
+BenchmarkFannkuch11-4   	       1	2707259763 ns/op
+BenchmarkFannkuch11-4   	       1	2730874571 ns/op
+BenchmarkFannkuch11-4   	       1	2768151653 ns/op
+BenchmarkFannkuch11-4   	       1	2712991281 ns/op
+PASS

test/bench/go1/go18/0020/entry.txt

+  fannkuch_test.go:12	0x75f990		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0021/bench.txt

+BenchmarkFannkuch11-4   	       1	2755906921 ns/op
+BenchmarkFannkuch11-4   	       1	2760444043 ns/op
+BenchmarkFannkuch11-4   	       1	2774135881 ns/op
+BenchmarkFannkuch11-4   	       1	2754577594 ns/op
+BenchmarkFannkuch11-4   	       1	2754096531 ns/op
+PASS

test/bench/go1/go18/0021/entry.txt

+  fannkuch_test.go:12	0x75f9a0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0022/bench.txt

+BenchmarkFannkuch11-4   	       1	2738990233 ns/op
+BenchmarkFannkuch11-4   	       1	2739561996 ns/op
+BenchmarkFannkuch11-4   	       1	2749356066 ns/op
+BenchmarkFannkuch11-4   	       1	2738930095 ns/op
+BenchmarkFannkuch11-4   	       1	2746038498 ns/op
+PASS

test/bench/go1/go18/0022/entry.txt

+  fannkuch_test.go:12	0x75f9b0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0023/bench.txt

+BenchmarkFannkuch11-4   	       1	2683228992 ns/op
+BenchmarkFannkuch11-4   	       1	2688456776 ns/op
+BenchmarkFannkuch11-4   	       1	2684098073 ns/op
+BenchmarkFannkuch11-4   	       1	2680591467 ns/op
+BenchmarkFannkuch11-4   	       1	2682648496 ns/op
+PASS

test/bench/go1/go18/0023/entry.txt

+  fannkuch_test.go:12	0x75f9c0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0024/bench.txt

+BenchmarkFannkuch11-4   	       1	2715631501 ns/op
+BenchmarkFannkuch11-4   	       1	2703396743 ns/op
+BenchmarkFannkuch11-4   	       1	2725246071 ns/op
+BenchmarkFannkuch11-4   	       1	2721316696 ns/op
+BenchmarkFannkuch11-4   	       1	2743999097 ns/op
+PASS

test/bench/go1/go18/0024/entry.txt

+  fannkuch_test.go:12	0x75f9d0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0025/bench.txt

+BenchmarkFannkuch11-4   	       1	2679328355 ns/op
+BenchmarkFannkuch11-4   	       1	2687741600 ns/op
+BenchmarkFannkuch11-4   	       1	2683315803 ns/op
+BenchmarkFannkuch11-4   	       1	2675913143 ns/op
+BenchmarkFannkuch11-4   	       1	2681861276 ns/op
+PASS

test/bench/go1/go18/0025/entry.txt

+  fannkuch_test.go:12	0x75f9e0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0026/bench.txt

+BenchmarkFannkuch11-4   	       1	2690848100 ns/op
+BenchmarkFannkuch11-4   	       1	2690025844 ns/op
+BenchmarkFannkuch11-4   	       1	2699678057 ns/op
+BenchmarkFannkuch11-4   	       1	2715778613 ns/op
+BenchmarkFannkuch11-4   	       1	2735784043 ns/op
+PASS

test/bench/go1/go18/0026/entry.txt

+  fannkuch_test.go:12	0x75f9e0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0027/bench.txt

+BenchmarkFannkuch11-4   	       1	2717979676 ns/op
+BenchmarkFannkuch11-4   	       1	2720393647 ns/op
+BenchmarkFannkuch11-4   	       1	2725767128 ns/op
+BenchmarkFannkuch11-4   	       1	2725693862 ns/op
+BenchmarkFannkuch11-4   	       1	2717554206 ns/op
+PASS

test/bench/go1/go18/0027/entry.txt

+  fannkuch_test.go:12	0x75f9f0		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0028/bench.txt

+BenchmarkFannkuch11-4   	       1	2682704432 ns/op
+BenchmarkFannkuch11-4   	       1	2679986027 ns/op
+BenchmarkFannkuch11-4   	       1	2679108464 ns/op
+BenchmarkFannkuch11-4   	       1	2682473532 ns/op
+BenchmarkFannkuch11-4   	       1	2689126691 ns/op
+PASS

test/bench/go1/go18/0028/entry.txt

+  fannkuch_test.go:12	0x75fa00		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0029/bench.txt

+BenchmarkFannkuch11-4   	       1	2689823572 ns/op
+BenchmarkFannkuch11-4   	       1	2688151214 ns/op
+BenchmarkFannkuch11-4   	       1	2693036705 ns/op
+BenchmarkFannkuch11-4   	       1	2687578262 ns/op
+BenchmarkFannkuch11-4   	       1	2688832490 ns/op
+PASS

test/bench/go1/go18/0029/entry.txt

+  fannkuch_test.go:12	0x75fa10		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0030/bench.txt

+BenchmarkFannkuch11-4   	       1	2734093609 ns/op
+BenchmarkFannkuch11-4   	       1	2747294346 ns/op
+BenchmarkFannkuch11-4   	       1	2733423092 ns/op
+BenchmarkFannkuch11-4   	       1	2730523943 ns/op
+BenchmarkFannkuch11-4   	       1	2729759931 ns/op
+PASS

test/bench/go1/go18/0030/entry.txt

+  fannkuch_test.go:12	0x75fa20		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0031/bench.txt

+BenchmarkFannkuch11-4   	       1	2697100175 ns/op
+BenchmarkFannkuch11-4   	       1	2698218454 ns/op
+BenchmarkFannkuch11-4   	       1	2704100169 ns/op
+BenchmarkFannkuch11-4   	       1	2696653759 ns/op
+BenchmarkFannkuch11-4   	       1	2730969611 ns/op
+PASS

test/bench/go1/go18/0031/entry.txt

+  fannkuch_test.go:12	0x75fa30		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/go18/0032/bench.txt

+BenchmarkFannkuch11-4   	       1	2670321850 ns/op
+BenchmarkFannkuch11-4   	       1	2676191105 ns/op
+BenchmarkFannkuch11-4   	       1	2671380487 ns/op
+BenchmarkFannkuch11-4   	       1	2685116043 ns/op
+BenchmarkFannkuch11-4   	       1	2675988758 ns/op
+PASS

test/bench/go1/go18/0032/entry.txt

+  fannkuch_test.go:12	0x75fa40		64488b0c25f8ffffff		MOVQ FS:0xfffffff8, CX						

test/bench/go1/plotit

+#!/usr/bin/env python
+
+import matplotlib.pyplot as plt
+import matplotlib.ticker as ticker
+import csv
+import numpy as np
+
+from collections import OrderedDict
+
+from glob import glob
+from os.path import basename
+
+def readfile(path):
+    with open(path, 'r') as f:
+        return f.read()
+
+
+class BenchResult:
+    # .entry    - funnkuch() entry
+    # .benchv   - []t(BenchmarkFannkuch11)
+    pass
+
+# loadbench loads benchmark results for fannkuch() with shifted entry
+def loadbench(topdir):
+
+    benchDict = OrderedDict()
+
+    for d in sorted(glob(topdir + "/[0-9][0-9][0-9][0-9]")):
+        entrytxt = readfile("%s/entry.txt" % d)
+        benchtxt = readfile("%s/bench.txt" % d)
+
+        # fannkuch_test.go:12   0x75f870                64488b0c25f8ffffff              MOVQ FS:0xfffffff8, CX
+        entry = int(entrytxt.split()[1], 0)
+
+        # goos: linux
+        # goarch: amd64
+        # BenchmarkFannkuch11-4                  1        2829784284 ns/op
+        # BenchmarkFannkuch11-4                  1        2829017327 ns/op
+        # BenchmarkFannkuch11-4                  1        2827053361 ns/op
+        # BenchmarkFannkuch11-4                  1        2827030975 ns/op
+        # BenchmarkFannkuch11-4                  1        2828888922 ns/op
+        # PASS
+        benchv = []
+        for benchline in benchtxt.splitlines():
+            _ = benchline.split()   # XXX hacky
+            if _[0] in ('goos:', 'goarch:'):
+                continue
+            if _[0] == 'PASS':
+                break
+            assert len(_) == 4
+
+            benchv.append(int(_[2]) / 1E9)
+
+
+        dd = int(basename(d))
+        result = BenchResult()
+        result.entry = entry
+        result.benchv = benchv
+
+        benchDict[dd] = result
+
+
+    return benchDict
+
+
+
+def plotbench(benchDict, **kw):
+    entryBase = benchDict[0].entry
+
+    entryv = []
+    benchvv = []
+    errv = []
+
+    for bb in benchDict.values():
+        entryv.append(bb.entry - entryBase)
+        #entryv.append(bb.entry)
+        #benchvv.append(bb.benchv)
+        benchvv.append(np.mean(bb.benchv))  # XXX no outlier filtering
+        errv.append(np.std(bb.benchv))
+
+    plt.errorbar(entryv, benchvv, yerr=errv, ecolor='black', capsize=2, **kw)
+
+
+
+def main():
+    b18          = loadbench("go18")
+    btip         = loadbench("go-4b0d74f8")
+    btip_cl43491 = loadbench("go-4b0d74f8+cl43491.3")
+
+    plt.figure(figsize=(12, 8))
+
+    plotbench(b18, color='green', label='go18')
+    plotbench(btip, color='blue', label='gotip (4b0d74f8)')
+    plotbench(btip_cl43491, color='red', label='gotip (4b0d74f8) + CL 43491.3')
+
+    #axes = plt.gca()
+    #axes.get_xaxis().set_major_formatter(ticker.FormatStrFormatter("0x%x"))
+
+    plt.title("Timing for Fannkuch11 depending on funnkuch() entry address shift")
+
+    plt.legend(loc=1)
+    plt.ylabel('time (s)')
+    plt.xlabel('entry shifted by (bytes)')   # XXX or better raw address ?
+    #plt.show()
+    plt.savefig('fannkuch.png')
+
+
+if __name__ == '__main__':
+    main()