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>

1 files changed, 45 insertions, 1 deletions

diff --git a/test/codegen/mathbits.go b/test/codegen/mathbits.go
index 02552e1fdb..98ee8f2a0b 100644
--- a/test/codegen/mathbits.go
+++ b/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"