test/codegen: port last stack and memcombining tests

And delete them from asm_test.

Also delete an arm64 cmov test has been already ported to the new test
harness.

Change-Id: I4458721e1f512bc9ecbbe1c22a2c9c7109ad68fe
Reviewed-on: https://go-review.googlesource.com/106335
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Giovanni Bajo <rasky@develer.com>

2 files changed, 30 insertions, 1 deletions

diff --git a/test/codegen/memcombine.go b/test/codegen/memcombine.go
index ec86a79317..17323bd2ab 100644
--- a/test/codegen/memcombine.go
+++ b/test/codegen/memcombine.go
@@ -6,7 +6,10 @@
 
 package codegen
 
-import "encoding/binary"
+import (
+	"encoding/binary"
+	"runtime"
+)
 
 var sink64 uint64
 var sink32 uint32
@@ -98,6 +101,11 @@ func load_be16_idx(b []byte, idx int) {
 	sink16 = binary.BigEndian.Uint16(b[idx:])
 }
 
+func load_byte2_uint16(s []byte) uint16 {
+	// arm64:`MOVHU\t\(R[0-9]+\)`,-`ORR\tR[0-9]+<<8`
+	return uint16(s[0]) | uint16(s[1])<<8
+}
+
 // Check load combining across function calls.
 
 func fcall_byte(a, b byte) (byte, byte) {
@@ -132,6 +140,15 @@ func offsets_fold(_, a [20]byte) (b [20]byte) {
 	return
 }
 
+// Make sure we don't put pointers in SSE registers across safe
+// points.
+
+func safe_point(p, q *[2]*int) {
+	a, b := p[0], p[1] // amd64:-`MOVUPS`
+	runtime.GC()
+	q[0], q[1] = a, b // amd64:-`MOVUPS`
+}
+
 // ------------- //
 //    Storing    //
 // ------------- //
diff --git a/test/codegen/stack.go b/test/codegen/stack.go
index 987d6a5b1f..da5ef24e13 100644
--- a/test/codegen/stack.go
+++ b/test/codegen/stack.go
@@ -6,6 +6,8 @@
 
 package codegen
 
+import "runtime"
+
 // This file contains code generation tests related to the use of the
 // stack.
 
@@ -22,3 +24,13 @@ func StackStore() int {
 	var x int
 	return *(&x)
 }
+
+// Check that assembly output has matching offset and base register
+// (Issue #21064).
+
+// amd64:`.*b\+24\(SP\)`
+// arm:`.*b\+4\(FP\)`
+func check_asmout(a, b int) int {
+	runtime.GC() // use some frame
+	return b
+}