all: remove nacl (part 3, more amd64p32)

Part 1: CL 199499 (GOOS nacl)
Part 2: CL 200077 (amd64p32 files, toolchain)
Part 3: stuff that arguably should've been part of Part 2, but I forgot
        one of my grep patterns when splitting the original CL up into
        two parts.

This one might also have interesting stuff to resurrect for any future
x32 ABI support.

Updates #30439

Change-Id: I2b4143374a253a003666f3c69e776b7e456bdb9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/200318
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/asm/internal/arch/arch.go

@@ -56,8 +56,6 @@ func Set(GOARCH string) *Arch {
 		return archX86(&x86.Link386)
 	case "amd64":
 		return archX86(&x86.Linkamd64)
-	case "amd64p32":
-		return archX86(&x86.Linkamd64p32)
 	case "arm":
 		return archArm()
 	case "arm64":

src/cmd/compile/internal/amd64/galign.go

@@ -7,17 +7,12 @@ package amd64
 import (
 	"cmd/compile/internal/gc"
 	"cmd/internal/obj/x86"
-	"cmd/internal/objabi"
 )
 
 var leaptr = x86.ALEAQ
 
 func Init(arch *gc.Arch) {
 	arch.LinkArch = &x86.Linkamd64
-	if objabi.GOARCH == "amd64p32" {
-		arch.LinkArch = &x86.Linkamd64p32
-		leaptr = x86.ALEAL
-	}
 	arch.REGSP = x86.REGSP
 	arch.MAXWIDTH = 1 << 50
 

src/cmd/compile/internal/ssa/config.go

@@ -210,19 +210,6 @@ func NewConfig(arch string, types Types, ctxt *obj.Link, optimize bool) *Config
 		c.FPReg = framepointerRegAMD64
 		c.LinkReg = linkRegAMD64
 		c.hasGReg = false
-	case "amd64p32":
-		c.PtrSize = 4
-		c.RegSize = 8
-		c.lowerBlock = rewriteBlockAMD64
-		c.lowerValue = rewriteValueAMD64
-		c.splitLoad = rewriteValueAMD64splitload
-		c.registers = registersAMD64[:]
-		c.gpRegMask = gpRegMaskAMD64
-		c.fpRegMask = fpRegMaskAMD64
-		c.FPReg = framepointerRegAMD64
-		c.LinkReg = linkRegAMD64
-		c.hasGReg = false
-		c.noDuffDevice = true
 	case "386":
 		c.PtrSize = 4
 		c.RegSize = 4

src/cmd/compile/internal/ssa/rewrite.go

@@ -1061,7 +1061,7 @@ func isInlinableMemmove(dst, src *Value, sz int64, c *Config) bool {
 	// lowers them, so we only perform this optimization on platforms that we know to
 	// have fast Move ops.
 	switch c.arch {
-	case "amd64", "amd64p32":
+	case "amd64":
 		return sz <= 16 || (sz < 1024 && disjoint(dst, sz, src, sz))
 	case "386", "ppc64", "ppc64le", "arm64":
 		return sz <= 8
@@ -1077,7 +1077,7 @@ func isInlinableMemmove(dst, src *Value, sz int64, c *Config) bool {
 // for sizes < 32-bit.  This is used to decide whether to promote some rotations.
 func hasSmallRotate(c *Config) bool {
 	switch c.arch {
-	case "amd64", "amd64p32", "386":
+	case "amd64", "386":
 		return true
 	default:
 		return false

src/cmd/compile/main.go

@@ -24,7 +24,6 @@ import (
 var archInits = map[string]func(*gc.Arch){
 	"386":      x86.Init,
 	"amd64":    amd64.Init,
-	"amd64p32": amd64.Init,
 	"arm":      arm.Init,
 	"arm64":    arm64.Init,
 	"mips":     mips.Init,

src/cmd/dist/build.go

@@ -61,7 +61,6 @@ var (
 var okgoarch = []string{
 	"386",
 	"amd64",
-	"amd64p32",
 	"arm",
 	"arm64",
 	"mips",
@@ -86,6 +85,7 @@ var okgoos = []string{
 	"android",
 	"solaris",
 	"freebsd",
+	"nacl", // keep;
 	"netbsd",
 	"openbsd",
 	"plan9",

src/cmd/go/internal/imports/build.go

@@ -210,7 +210,7 @@ var KnownOS = map[string]bool{
 	"illumos":   true,
 	"js":        true,
 	"linux":     true,
-	"nacl":      true,
+	"nacl":      true, // legacy; don't remove
 	"netbsd":    true,
 	"openbsd":   true,
 	"plan9":     true,
@@ -222,7 +222,7 @@ var KnownOS = map[string]bool{
 var KnownArch = map[string]bool{
 	"386":         true,
 	"amd64":       true,
-	"amd64p32":    true,
+	"amd64p32":    true, // legacy; don't remove
 	"arm":         true,
 	"armbe":       true,
 	"arm64":       true,

src/cmd/go/internal/work/exec.go

@@ -2390,7 +2390,7 @@ func (b *Builder) gccArchArgs() []string {
 	switch cfg.Goarch {
 	case "386":
 		return []string{"-m32"}
-	case "amd64", "amd64p32":
+	case "amd64":
 		return []string{"-m64"}
 	case "arm":
 		return []string{"-marm"} // not thumb

src/cmd/internal/obj/x86/obj6.go

@@ -1226,16 +1226,6 @@ var Linkamd64 = obj.LinkArch{
 	DWARFRegisters: AMD64DWARFRegisters,
 }
 
-var Linkamd64p32 = obj.LinkArch{
-	Arch:           sys.ArchAMD64P32,
-	Init:           instinit,
-	Preprocess:     preprocess,
-	Assemble:       span6,
-	Progedit:       progedit,
-	UnaryDst:       unaryDst,
-	DWARFRegisters: AMD64DWARFRegisters,
-}
-
 var Link386 = obj.LinkArch{
 	Arch:           sys.Arch386,
 	Init:           instinit,

src/cmd/internal/objfile/disasm.go

@@ -241,7 +241,7 @@ func (d *Disasm) Print(w io.Writer, filter *regexp.Regexp, start, end uint64, pr
 				fmt.Fprintf(tw, "  %s:%d\t%#x\t", base(file), line, pc)
 			}
 
-			if size%4 != 0 || d.goarch == "386" || d.goarch == "amd64" || d.goarch == "amd64p32" {
+			if size%4 != 0 || d.goarch == "386" || d.goarch == "amd64" {
 				// Print instruction as bytes.
 				fmt.Fprintf(tw, "%x", code[i:i+size])
 			} else {
@@ -369,7 +369,6 @@ func disasm_ppc64(code []byte, pc uint64, lookup lookupFunc, byteOrder binary.By
 var disasms = map[string]disasmFunc{
 	"386":     disasm_386,
 	"amd64":   disasm_amd64,
-	"amd64p32": disasm_amd64,
 	"arm":     disasm_arm,
 	"arm64":   disasm_arm64,
 	"ppc64":   disasm_ppc64,
@@ -379,7 +378,6 @@ var disasms = map[string]disasmFunc{
 var byteOrders = map[string]binary.ByteOrder{
 	"386":     binary.LittleEndian,
 	"amd64":   binary.LittleEndian,
-	"amd64p32": binary.LittleEndian,
 	"arm":     binary.LittleEndian,
 	"arm64":   binary.LittleEndian,
 	"ppc64":   binary.BigEndian,

src/cmd/internal/sys/arch.go

@@ -7,8 +7,7 @@ package sys
 import "encoding/binary"
 
 // ArchFamily represents a family of one or more related architectures.
-// For example, amd64 and amd64p32 are both members of the AMD64 family,
-// and ppc64 and ppc64le are both members of the PPC64 family.
+// For example, ppc64 and ppc64le are both members of the PPC64 family.
 type ArchFamily byte
 
 const (
@@ -72,15 +71,6 @@ var ArchAMD64 = &Arch{
 	MinLC:     1,
 }
 
-var ArchAMD64P32 = &Arch{
-	Name:      "amd64p32",
-	Family:    AMD64,
-	ByteOrder: binary.LittleEndian,
-	PtrSize:   4,
-	RegSize:   8,
-	MinLC:     1,
-}
-
 var ArchARM = &Arch{
 	Name:      "arm",
 	Family:    ARM,
@@ -183,7 +173,6 @@ var ArchWasm = &Arch{
 var Archs = [...]*Arch{
 	Arch386,
 	ArchAMD64,
-	ArchAMD64P32,
 	ArchARM,
 	ArchARM64,
 	ArchMIPS,

src/cmd/link/internal/amd64/obj.go

@@ -38,9 +38,6 @@ import (
 
 func Init() (*sys.Arch, ld.Arch) {
 	arch := sys.ArchAMD64
-	if objabi.GOARCH == "amd64p32" {
-		arch = sys.ArchAMD64P32
-	}
 
 	theArch := ld.Arch{
 		Funcalign:  funcAlign,

src/cmd/link/main.go

@@ -45,7 +45,7 @@ func main() {
 		os.Exit(2)
 	case "386":
 		arch, theArch = x86.Init()
-	case "amd64", "amd64p32":
+	case "amd64":
 		arch, theArch = amd64.Init()
 	case "arm":
 		arch, theArch = arm.Init()

src/crypto/md5/md5block_decl.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64 amd64p32 386 arm ppc64le ppc64 s390x arm64
+// +build amd64 386 arm ppc64le ppc64 s390x arm64
 
 package md5
 

src/crypto/md5/md5block_generic.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !amd64,!amd64p32,!386,!arm,!ppc64le,!ppc64,!s390x,!arm64
+// +build !amd64,!386,!arm,!ppc64le,!ppc64,!s390x,!arm64
 
 package md5
 

src/crypto/sha1/sha1block_decl.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64p32 arm 386 s390x
+// +build arm 386 s390x
 
 package sha1
 

src/crypto/sha1/sha1block_generic.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !amd64,!amd64p32,!386,!arm,!s390x,!arm64
+// +build !amd64,!386,!arm,!s390x,!arm64
 
 package sha1
 

src/go/build/syslist.go

@@ -4,5 +4,8 @@
 
 package build
 
+// List of past, present, and future known GOOS and GOARCH values.
+// Do not remove from this list, as these are used for go/build filename matching.
+
 const goosList = "aix android darwin dragonfly freebsd hurd illumos js linux nacl netbsd openbsd plan9 solaris windows zos "
 const goarchList = "386 amd64 amd64p32 arm armbe arm64 arm64be ppc64 ppc64le mips mipsle mips64 mips64le mips64p32 mips64p32le ppc riscv riscv64 s390 s390x sparc sparc64 wasm "

src/hash/crc32/crc32_otherarch.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !amd64,!amd64p32,!s390x,!ppc64le,!arm64
+// +build !amd64,!s390x,!ppc64le,!arm64
 
 package crc32
 

src/internal/bytealg/compare_generic.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !386,!amd64,!amd64p32,!s390x,!arm,!arm64,!ppc64,!ppc64le,!mips,!mipsle,!wasm,!mips64,!mips64le
+// +build !386,!amd64,!s390x,!arm,!arm64,!ppc64,!ppc64le,!mips,!mipsle,!wasm,!mips64,!mips64le
 
 package bytealg
 

src/internal/bytealg/compare_native.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build 386 amd64 amd64p32 s390x arm arm64 ppc64 ppc64le mips mipsle wasm mips64 mips64le
+// +build 386 amd64 s390x arm arm64 ppc64 ppc64le mips mipsle wasm mips64 mips64le
 
 package bytealg
 

src/internal/bytealg/indexbyte_generic.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !386,!amd64,!amd64p32,!s390x,!arm,!arm64,!ppc64,!ppc64le,!mips,!mipsle,!mips64,!mips64le,!wasm
+// +build !386,!amd64,!s390x,!arm,!arm64,!ppc64,!ppc64le,!mips,!mipsle,!mips64,!mips64le,!wasm
 
 package bytealg
 

src/internal/bytealg/indexbyte_native.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build 386 amd64 amd64p32 s390x arm arm64 ppc64 ppc64le mips mipsle mips64 mips64le wasm
+// +build 386 amd64 s390x arm arm64 ppc64 ppc64le mips mipsle mips64 mips64le wasm
 
 package bytealg
 

src/internal/cpu/cpu_no_init.go

@@ -4,7 +4,6 @@
 
 // +build !386
 // +build !amd64
-// +build !amd64p32
 // +build !arm
 // +build !arm64
 // +build !ppc64

src/internal/cpu/cpu_x86.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build 386 amd64 amd64p32
+// +build 386 amd64
 
 package cpu
 
@@ -55,8 +55,8 @@ func doinit() {
 		{Name: "sse42", Feature: &X86.HasSSE42},
 		{Name: "ssse3", Feature: &X86.HasSSSE3},
 
-		// These capabilities should always be enabled on amd64(p32):
-		{Name: "sse2", Feature: &X86.HasSSE2, Required: GOARCH == "amd64" || GOARCH == "amd64p32"},
+		// These capabilities should always be enabled on amd64:
+		{Name: "sse2", Feature: &X86.HasSSE2, Required: GOARCH == "amd64"},
 	}
 
 	maxID, _, _, _ := cpuid(0, 0)

src/internal/cpu/cpu_x86.s

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build 386 amd64 amd64p32
+// +build 386 amd64
 
 #include "textflag.h"
 

src/internal/cpu/cpu_x86_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build 386 amd64 amd64p32
+// +build 386 amd64
 
 package cpu_test
 

src/math/exp_asm.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64 amd64p32
+// +build amd64
 
 package math
 

src/reflect/all_test.go

@@ -6104,9 +6104,6 @@ var funcLayoutTests []funcLayoutTest
 
 func init() {
 	var argAlign uintptr = PtrSize
-	if runtime.GOARCH == "amd64p32" {
-		argAlign = 2 * PtrSize
-	}
 	roundup := func(x uintptr, a uintptr) uintptr {
 		return (x + a - 1) / a * a
 	}

src/reflect/type.go

@@ -16,7 +16,6 @@
 package reflect
 
 import (
-	"runtime"
 	"strconv"
 	"sync"
 	"unicode"
@@ -3015,9 +3014,6 @@ func funcLayout(t *funcType, rcvr *rtype) (frametype *rtype, argSize, retOffset
 		offset += arg.size
 	}
 	argSize = offset
-	if runtime.GOARCH == "amd64p32" {
-		offset += -offset & (8 - 1)
-	}
 	offset += -offset & (ptrSize - 1)
 	retOffset = offset
 	for _, res := range t.out() {
@@ -3033,9 +3029,6 @@ func funcLayout(t *funcType, rcvr *rtype) (frametype *rtype, argSize, retOffset
 		size:    offset,
 		ptrdata: uintptr(ptrmap.n) * ptrSize,
 	}
-	if runtime.GOARCH == "amd64p32" {
-		x.align = 8
-	}
 	if ptrmap.n > 0 {
 		x.gcdata = &ptrmap.data[0]
 	}

src/reflect/value.go

@@ -555,9 +555,6 @@ func callReflect(ctxt *makeFuncImpl, frame unsafe.Pointer, retValid *bool) {
 	// Copy results back into argument frame.
 	if numOut > 0 {
 		off += -off & (ptrSize - 1)
-		if runtime.GOARCH == "amd64p32" {
-			off = align(off, 8)
-		}
 		for i, typ := range ftyp.out() {
 			v := out[i]
 			if v.typ == nil {
@@ -697,8 +694,7 @@ func callMethod(ctxt *methodValue, frame unsafe.Pointer, retValid *bool) {
 
 	// Copy in receiver and rest of args.
 	storeRcvr(rcvr, scratch)
-	// Align the first arg. Only on amd64p32 the alignment can be
-	// larger than ptrSize.
+	// Align the first arg. The alignment can't be larger than ptrSize.
 	argOffset := uintptr(ptrSize)
 	if len(t.in()) > 0 {
 		argOffset = align(argOffset, uintptr(t.in()[0].align))
@@ -713,17 +709,11 @@ func callMethod(ctxt *methodValue, frame unsafe.Pointer, retValid *bool) {
 	// and then copies the results back into scratch.
 	call(frametype, fn, scratch, uint32(frametype.size), uint32(retOffset))
 
-	// Copy return values. On amd64p32, the beginning of return values
-	// is 64-bit aligned, so the caller's frame layout (which doesn't have
-	// a receiver) is different from the layout of the fn call, which has
-	// a receiver.
+	// Copy return values.
 	// Ignore any changes to args and just copy return values.
 	// Avoid constructing out-of-bounds pointers if there are no return values.
 	if frametype.size-retOffset > 0 {
 		callerRetOffset := retOffset - argOffset
-		if runtime.GOARCH == "amd64p32" {
-			callerRetOffset = align(argSize-argOffset, 8)
-		}
 		// This copies to the stack. Write barriers are not needed.
 		memmove(add(frame, callerRetOffset, "frametype.size > retOffset"),
 			add(scratch, retOffset, "frametype.size > retOffset"),

src/runtime/asm.s

@@ -19,9 +19,6 @@ GLOBL runtime·no_pointers_stackmap(SB),RODATA, $8
 #ifdef GOARCH_386
 #define SKIP4 BYTE $0x90; BYTE $0x90; BYTE $0x90; BYTE $0x90
 #endif
-#ifdef GOARCH_amd64p32
-#define SKIP4 BYTE $0x90; BYTE $0x90; BYTE $0x90; BYTE $0x90
-#endif
 #ifdef GOARCH_wasm
 #define SKIP4 UNDEF; UNDEF; UNDEF; UNDEF
 #endif

src/runtime/gcinfo_test.go

@@ -187,14 +187,6 @@ func infoBigStruct() []byte {
 			typeScalar, typeScalar, typeScalar, // t int; y uint16; u uint64
 			typePointer, typeScalar, // i string
 		}
-	case "amd64p32":
-		return []byte{
-			typePointer,                                                // q *int
-			typeScalar, typeScalar, typeScalar, typeScalar, typeScalar, // w byte; e [17]byte
-			typePointer, typeScalar, typeScalar, // r []byte
-			typeScalar, typeScalar, typeScalar, typeScalar, typeScalar, // t int; y uint16; u uint64
-			typePointer, typeScalar, // i string
-		}
 	default:
 		panic("unknown arch")
 	}

src/runtime/go_tls.h

@@ -11,11 +11,6 @@
 #define	g(r)	0(r)(TLS*1)
 #endif
 
-#ifdef GOARCH_amd64p32
-#define	get_tls(r)	MOVL TLS, r
-#define	g(r)	0(r)(TLS*1)
-#endif
-
 #ifdef GOARCH_386
 #define	get_tls(r)	MOVL TLS, r
 #define	g(r)	0(r)(TLS*1)

src/runtime/hash64.go

@@ -6,7 +6,7 @@
 //   xxhash: https://code.google.com/p/xxhash/
 // cityhash: https://code.google.com/p/cityhash/
 
-// +build amd64 amd64p32 arm64 mips64 mips64le ppc64 ppc64le s390x wasm
+// +build amd64 arm64 mips64 mips64le ppc64 ppc64le s390x wasm
 
 package runtime
 

src/runtime/internal/atomic/atomic_amd64x.go → src/runtime/internal/atomic/atomic_amd64.go

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64 amd64p32
-
 package atomic
 
 import "unsafe"

src/runtime/internal/atomic/atomic_test.go

@@ -86,15 +86,9 @@ func TestUnaligned64(t *testing.T) {
 	// a continual source of pain. Test that on 32-bit systems they crash
 	// instead of failing silently.
 
-	switch runtime.GOARCH {
-	default:
 	if unsafe.Sizeof(int(0)) != 4 {
 		t.Skip("test only runs on 32-bit systems")
 	}
-	case "amd64p32":
-		// amd64p32 can handle unaligned atomics.
-		t.Skipf("test not needed on %v", runtime.GOARCH)
-	}
 
 	x := make([]uint32, 4)
 	u := unsafe.Pointer(uintptr(unsafe.Pointer(&x[0])) | 4) // force alignment to 4

src/runtime/panic32.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build 386 amd64p32 arm mips mipsle
+// +build 386 arm mips mipsle
 
 package runtime
 

src/runtime/runtime2.go

@@ -922,7 +922,7 @@ var (
 	// Information about what cpu features are available.
 	// Packages outside the runtime should not use these
 	// as they are not an external api.
-	// Set on startup in asm_{386,amd64,amd64p32}.s
+	// Set on startup in asm_{386,amd64}.s
 	processorVersionInfo uint32
 	isIntel              bool
 	lfenceBeforeRdtsc    bool

src/runtime/signal_amd64x.go → src/runtime/signal_amd64.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64 amd64p32
+// +build amd64
 // +build darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package runtime

src/runtime/stubs32.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build 386 arm amd64p32 mips mipsle
+// +build 386 arm mips mipsle
 
 package runtime
 

src/runtime/stubs_amd64x.go → src/runtime/stubs_amd64.go

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64 amd64p32
-
 package runtime
 
 // stackcheck checks that SP is in range [g->stack.lo, g->stack.hi).

src/runtime/sys_x86.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64 amd64p32 386
+// +build amd64 386
 
 package runtime
 

src/runtime/trace.go

@@ -84,7 +84,7 @@ const (
 	// and ppc64le.
 	// Tracing won't work reliably for architectures where cputicks is emulated
 	// by nanotime, so the value doesn't matter for those architectures.
-	traceTickDiv = 16 + 48*(sys.Goarch386|sys.GoarchAmd64|sys.GoarchAmd64p32)
+	traceTickDiv = 16 + 48*(sys.Goarch386|sys.GoarchAmd64)
 	// Maximum number of PCs in a single stack trace.
 	// Since events contain only stack id rather than whole stack trace,
 	// we can allow quite large values here.

src/runtime/traceback.go

@@ -26,8 +26,8 @@ import (
 // takes up only 4 bytes on the stack, while on 64-bit systems it takes up 8 bytes.
 // Typically this is ptrSize.
 //
-// As an exception, amd64p32 has ptrSize == 4 but the CALL instruction still
-// stores an 8-byte return PC onto the stack. To accommodate this, we use regSize
+// As an exception, amd64p32 had ptrSize == 4 but the CALL instruction still
+// stored an 8-byte return PC onto the stack. To accommodate this, we used regSize
 // as the size of the architecture-pushed return PC.
 //
 // usesLR is defined below in terms of minFrameSize, which is defined in

src/sync/atomic/atomic_test.go

@@ -1391,16 +1391,9 @@ func TestUnaligned64(t *testing.T) {
 	// Unaligned 64-bit atomics on 32-bit systems are
 	// a continual source of pain. Test that on 32-bit systems they crash
 	// instead of failing silently.
-
-	switch runtime.GOARCH {
-	default:
 	if !arch32 {
 		t.Skip("test only runs on 32-bit systems")
 	}
-	case "amd64p32":
-		// amd64p32 can handle unaligned atomics.
-		t.Skipf("test not needed on %v", runtime.GOARCH)
-	}
 
 	x := make([]uint32, 4)
 	p := (*uint64)(unsafe.Pointer(&x[1])) // misaligned

src/syscall/endian_little.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 //
-// +build 386 amd64 amd64p32 arm arm64 ppc64le mips64le mipsle wasm
+// +build 386 amd64 arm arm64 ppc64le mips64le mipsle wasm
 
 package syscall