cmd/compile: make math/bits.RotateLeft{32,64} intrinsics on s390x

Extends CL 132435 to s390x. s390x has 32- and 64-bit variable
rotate left instructions.

Change-Id: Ic4f1ebb0e0543207ed2fc8c119e0163b428138a5
Reviewed-on: https://go-review.googlesource.com/133035
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/test/codegen/mathbits.go b/test/codegen/mathbits.go
index ad2c5abb02..b8844c518f 100644
--- a/test/codegen/mathbits.go
+++ b/test/codegen/mathbits.go
@@ -171,6 +171,7 @@ func RotateLeft64(n uint64) uint64 {
 	// amd64:"ROLQ"
 	// arm64:"ROR"
 	// ppc64:"ROTL"
+	// s390x:"RLLG"
 	return bits.RotateLeft64(n, 37)
 }
 
@@ -178,6 +179,7 @@ func RotateLeft32(n uint32) uint32 {
 	// amd64:"ROLL" 386:"ROLL"
 	// arm64:"RORW"
 	// ppc64:"ROTLW"
+	// s390x:"RLL"
 	return bits.RotateLeft32(n, 9)
 }
 
@@ -191,6 +193,27 @@ func RotateLeft8(n uint8) uint8 {
 	return bits.RotateLeft8(n, 5)
 }
 
+func RotateLeftVariable(n uint, m int) uint {
+	// amd64:"ROLQ"
+	// ppc64:"ROTL"
+	// s390x:"RLLG"
+	return bits.RotateLeft(n, m)
+}
+
+func RotateLeftVariable64(n uint64, m int) uint64 {
+	// amd64:"ROLQ"
+	// ppc64:"ROTL"
+	// s390x:"RLLG"
+	return bits.RotateLeft64(n, m)
+}
+
+func RotateLeftVariable32(n uint32, m int) uint32 {
+	// amd64:"ROLL"
+	// ppc64:"ROTLW"
+	// s390x:"RLL"
+	return bits.RotateLeft32(n, m)
+}
+
 // ------------------------ //
 //    bits.TrailingZeros    //
 // ------------------------ //