[dev.ssa] Merge remote-tracking branch 'origin/master' into mergebranch

[gostls13.git] / src / cmd / compile / internal / ssa / gen / AMD64.rules

diff --git a/src/cmd/compile/internal/ssa/gen/AMD64.rules b/src/cmd/compile/internal/ssa/gen/AMD64.rules
index f160ce81af67e292c80f7233a4f2816fdf93d1f2..ffa5feaabf94ca7eef2387b70199d2131d899053 100644 (file)
--- a/src/cmd/compile/internal/ssa/gen/AMD64.rules
+++ b/src/cmd/compile/internal/ssa/gen/AMD64.rules
@@ -602,8 +602,10 @@
                                (MOVQstore destptr (MOVQconst [0]) mem))))
 
 // Medium zeroing uses a duff device.
-(Zero [size] destptr mem) && size <= 1024 && size%8 == 0 ->
-       (DUFFZERO [duffStart(size)] (ADDQconst [duffAdj(size)] destptr) (MOVQconst [0]) mem)
+(Zero [size] destptr mem) && size <= 1024 && size%8 == 0 && size%16 != 0 ->
+       (Zero [size-8] (ADDQconst [8] destptr) (MOVQstore destptr (MOVQconst [0]) mem))
+(Zero [size] destptr mem) && size <= 1024 && size%16 == 0 ->
+       (DUFFZERO [duffStart(size)] (ADDQconst [duffAdj(size)] destptr) (MOVOconst [0]) mem)
 
 // Large zeroing uses REP STOSQ.
 (Zero [size] destptr mem) && size > 1024 && size%8 == 0 ->