test/codegen: port last remaining misc bit/arithmetic tests

And delete them from asm_test.

Change-Id: I9a75efe9858ef9d7ac86065f860c2ae3f25b0941
Reviewed-on: https://go-review.googlesource.com/105597Reviewed-by: Daniel Martí <mvdan@mvdan.cc>

src/cmd/compile/internal/gc/asm_test.go

@@ -238,11 +238,6 @@ var allAsmTests = []*asmTests{
 		os:    "linux",
 		tests: linuxARM64Tests,
 	},
-	{
-		arch:  "mips64",
-		os:    "linux",
-		tests: linuxMIPS64Tests,
-	},
 	{
 		arch:  "amd64",
 		os:    "plan9",
@@ -251,14 +246,6 @@ var allAsmTests = []*asmTests{
 }
 
 var linuxAMD64Tests = []*asmTest{
-	{
-		fn: `
-		func $(x int) int {
-			return x * 96
-		}
-		`,
-		pos: []string{"\tSHLQ\t\\$5,", "\tLEAQ\t\\(.*\\)\\(.*\\*2\\),"},
-	},
 	{
 		// make sure assembly output has matching offset and base register.
 		fn: `
@@ -339,17 +326,6 @@ var linuxARM64Tests = []*asmTest{
 		`,
 		pos: []string{"\tAND\t"},
 	},
-	{
-		// check that we don't emit comparisons for constant shift
-		fn: `
-//go:nosplit
-		func $(x int) int {
-			return x << 17
-		}
-		`,
-		pos: []string{"LSL\t\\$17"},
-		neg: []string{"CMP"},
-	},
 	// Load-combining tests.
 	{
 		fn: `
@@ -375,19 +351,6 @@ var linuxARM64Tests = []*asmTest{
 	},
 }
 
-var linuxMIPS64Tests = []*asmTest{
-	{
-		// check that we don't emit comparisons for constant shift
-		fn: `
-		func $(x int) int {
-			return x << 17
-		}
-		`,
-		pos: []string{"SLLV\t\\$17"},
-		neg: []string{"SGT"},
-	},
-}
-
 var plan9AMD64Tests = []*asmTest{
 	// We should make sure that the compiler doesn't generate floating point
 	// instructions for non-float operations on Plan 9, because floating point

test/codegen/arithmetic.go

@@ -30,6 +30,11 @@ func Pow2Muls(n1, n2 int) (int, int) {
 	return a, b
 }
 
+func Mul_96(n int) int {
+	// amd64:`SHLQ\t[$]5`,`LEAQ\t\(.*\)\(.*\*2\),`
+	return n * 96
+}
+
 // Multiplications merging tests
 
 func MergeMuls1(n int) int {

test/codegen/bitfield.go

@@ -222,3 +222,11 @@ func ubfx11(x uint64) uint64 {
 	// arm64:"UBFX\t[$]1, R[0-9]+, [$]19",-"LSL",-"LSR"
 	return ((x & 0xfffff) << 3) >> 4
 }
+
+// Check that we don't emit comparisons for constant shifts.
+//go:nosplit
+func shift_no_cmp(x int) int {
+	// arm64:`LSL\t[$]17`,-`CMP`
+	// mips64:`SLLV\t[$]17`,-`SGT`
+	return x << 17
+}