test/codegen: port math/bits.Leadingzero tests to codegen

Change-Id: Ic21d25db5d56ce77516c53082dfbc010e5875b81
Reviewed-on: https://go-review.googlesource.com/98655
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

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

@@ -241,7 +241,7 @@ var allAsmTests = []*asmTests{
 	{
 		arch:    "arm",
 		os:      "linux",
-		imports: []string{"math/bits", "runtime"},
+		imports: []string{"runtime"},
 		tests:   linuxARMTests,
 	},
 	{
@@ -251,10 +251,9 @@ var allAsmTests = []*asmTests{
 		tests:   linuxARM64Tests,
 	},
 	{
-		arch:    "mips",
-		os:      "linux",
-		imports: []string{"math/bits"},
-		tests:   linuxMIPSTests,
+		arch:  "mips",
+		os:    "linux",
+		tests: linuxMIPSTests,
 	},
 	{
 		arch:  "mips64",
@@ -580,48 +579,6 @@ var linuxAMD64Tests = []*asmTest{
 		`,
 		pos: []string{"\tROLW\t\\$8,"},
 	},
-	{
-		fn: `
-		func f53(a uint64) int {
-			return bits.LeadingZeros64(a)
-		}
-		`,
-		pos: []string{"\tBSRQ\t"},
-	},
-	{
-		fn: `
-		func f54(a uint32) int {
-			return bits.LeadingZeros32(a)
-		}
-		`,
-		pos: []string{"\tBSRQ\t"},
-	},
-	{
-		fn: `
-		func f55(a uint16) int {
-			return bits.LeadingZeros16(a)
-		}
-		`,
-		pos: []string{"\tBSRQ\t"},
-	},
-	/* see ssa.go
-	{
-		fn:`
-		func f56(a uint8) int {
-			return bits.LeadingZeros8(a)
-		}
-		`,
-		pos:[]string{"\tBSRQ\t"},
-	},
-	*/
-	{
-		fn: `
-		func f57(a uint) int {
-			return bits.LeadingZeros(a)
-		}
-		`,
-		pos: []string{"\tBSRQ\t"},
-	},
 	{
 		fn: `
 		func pop1(x uint64) int {
@@ -1322,46 +1279,6 @@ var linuxS390XTests = []*asmTest{
 		`,
 		pos: []string{"\tMOVWBR\t"},
 	},
-	{
-		fn: `
-		func f29(a uint64) int {
-			return bits.LeadingZeros64(a)
-		}
-		`,
-		pos: []string{"\tFLOGR\t"},
-	},
-	{
-		fn: `
-		func f30(a uint32) int {
-			return bits.LeadingZeros32(a)
-		}
-		`,
-		pos: []string{"\tFLOGR\t"},
-	},
-	{
-		fn: `
-		func f31(a uint16) int {
-			return bits.LeadingZeros16(a)
-		}
-		`,
-		pos: []string{"\tFLOGR\t"},
-	},
-	{
-		fn: `
-		func f32(a uint8) int {
-			return bits.LeadingZeros8(a)
-		}
-		`,
-		pos: []string{"\tFLOGR\t"},
-	},
-	{
-		fn: `
-		func f33(a uint) int {
-			return bits.LeadingZeros(a)
-		}
-		`,
-		pos: []string{"\tFLOGR\t"},
-	},
 	{
 		// check that stack store is optimized away
 		fn: `
@@ -1419,46 +1336,6 @@ var linuxARMTests = []*asmTest{
 		`,
 		pos: []string{"\tMOVW\tR[0-9]+@>25,"},
 	},
-	{
-		fn: `
-		func f8(a uint64) int {
-			return bits.LeadingZeros64(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
-	{
-		fn: `
-		func f9(a uint32) int {
-			return bits.LeadingZeros32(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
-	{
-		fn: `
-		func f10(a uint16) int {
-			return bits.LeadingZeros16(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
-	{
-		fn: `
-		func f11(a uint8) int {
-			return bits.LeadingZeros8(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
-	{
-		fn: `
-		func f12(a uint) int {
-			return bits.LeadingZeros(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
 	{
 		// make sure assembly output has matching offset and base register.
 		fn: `
@@ -1593,46 +1470,6 @@ var linuxARM64Tests = []*asmTest{
 		`,
 		pos: []string{"\tREVW\t"},
 	},
-	{
-		fn: `
-		func f29(a uint64) int {
-			return bits.LeadingZeros64(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
-	{
-		fn: `
-		func f30(a uint32) int {
-			return bits.LeadingZeros32(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
-	{
-		fn: `
-		func f31(a uint16) int {
-			return bits.LeadingZeros16(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
-	{
-		fn: `
-		func f32(a uint8) int {
-			return bits.LeadingZeros8(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
-	{
-		fn: `
-		func f33(a uint) int {
-			return bits.LeadingZeros(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
 	{
 		fn: `
 		func f34(a uint64) uint64 {
@@ -2014,47 +1851,6 @@ var linuxARM64Tests = []*asmTest{
 }
 
 var linuxMIPSTests = []*asmTest{
-	// Intrinsic tests for math/bits
-	{
-		fn: `
-		func f5(a uint64) int {
-			return bits.LeadingZeros64(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
-	{
-		fn: `
-		func f6(a uint32) int {
-			return bits.LeadingZeros32(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
-	{
-		fn: `
-		func f7(a uint16) int {
-			return bits.LeadingZeros16(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
-	{
-		fn: `
-		func f8(a uint8) int {
-			return bits.LeadingZeros8(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
-	{
-		fn: `
-		func f9(a uint) int {
-			return bits.LeadingZeros(a)
-		}
-		`,
-		pos: []string{"\tCLZ\t"},
-	},
 	{
 		// check that stack store is optimized away
 		fn: `

test/codegen/mathbits.go

@@ -8,6 +8,50 @@ package codegen
 
 import "math/bits"
 
+// ----------------------- //
+//    bits.LeadingZeros    //
+// ----------------------- //
+
+func LeadingZeros(n uint) int {
+	//amd64:"BSRQ"
+	//s390x:"FLOGR"
+	//arm:"CLZ" arm64:"CLZ"
+	//mips:"CLZ"
+	return bits.LeadingZeros(n)
+}
+
+func LeadingZeros64(n uint64) int {
+	//amd64:"BSRQ"
+	//s390x:"FLOGR"
+	//arm:"CLZ" arm64:"CLZ"
+	//mips:"CLZ"
+	return bits.LeadingZeros64(n)
+}
+
+func LeadingZeros32(n uint32) int {
+	//amd64:"BSRQ"
+	//s390x:"FLOGR"
+	//arm:"CLZ" arm64:"CLZ"
+	//mips:"CLZ"
+	return bits.LeadingZeros32(n)
+}
+
+func LeadingZeros16(n uint16) int {
+	//amd64:"BSRQ"
+	//s390x:"FLOGR"
+	//arm:"CLZ" arm64:"CLZ"
+	//mips:"CLZ"
+	return bits.LeadingZeros16(n)
+}
+
+func LeadingZeros8(n uint8) int {
+	//amd64 LeadingZeros8 not intrinsified (see ssa.go)
+	//s390x:"FLOGR"
+	//arm:"CLZ" arm64:"CLZ"
+	//mips:"CLZ"
+	return bits.LeadingZeros8(n)
+}
+
 // --------------- //
 //    bits.Len*    //
 // --------------- //
@@ -45,7 +89,7 @@ func Len16(n uint16) int {
 }
 
 func Len8(n uint8) int {
-	//amd64 Len8 not intrisified
+	//amd64 Len8 not intrisified (see ssa.go)
 	//s390x:"FLOGR"
 	//arm:"CLZ" arm64:"CLZ"
 	//mips:"CLZ"