sync/atomic: fix LoadInt32 on ARM

R0 is clobbered after cas,
while R1 preserves its value.

R=golang-dev
CC=golang-dev
https://golang.org/cl/4782042

diff --git a/src/pkg/sync/atomic/asm_linux_arm.s b/src/pkg/sync/atomic/asm_linux_arm.s
index a09e06703aac9d16de3ee36edb86a9bcb608018f..9ac411944c95e74034c6d27f661aec592c2346ab 100644 (file)
--- a/src/pkg/sync/atomic/asm_linux_arm.s
+++ b/src/pkg/sync/atomic/asm_linux_arm.s
@@ -94,5 +94,5 @@ loadloop1:
        MOVW    R0, R1
        BL      cas<>(SB)
        BCC     loadloop1
-       MOVW    R0, val+4(FP)
+       MOVW    R1, val+4(FP)
        RET