qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-19 11:34:49 -07:00
Code Releases Activity

cmd/compile: fix constant propagation through s390x MOVDNE instructions

Browse Source 
The constant propagation rules selected the wrong operand to
propagate. So MOVDNE (move if not equal) propagated operands as if
it were a MOVDEQ (move if equal).

Fixes #18735.

Change-Id: I87ac469172f9df7d5aabaf7106e2936ce54ae202
Reviewed-on: https://go-review.googlesource.com/35498
Run-TryBot: Michael Munday <munday@ca.ibm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Michael Munday 2017-01-20 22:03:13 -05:00
parent 1be957d703
commit 4cce27a3fa
2 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/cmd/compile/internal/ssa/gen/S390X.rules
View File

@ -885,9 +885,9 @@
(MOVDEQ y _ (FlagLT)) -> y
(MOVDEQ y _ (FlagGT)) -> y
(MOVDNE _ y (FlagEQ)) -> y
(MOVDNE x _ (FlagLT)) -> x
(MOVDNE x _ (FlagGT)) -> x
(MOVDNE y _ (FlagEQ)) -> y
(MOVDNE _ x (FlagLT)) -> x
(MOVDNE _ x (FlagGT)) -> x
(MOVDLT y _ (FlagEQ)) -> y
(MOVDLT _ x (FlagLT)) -> x

12
src/cmd/compile/internal/ssa/rewriteS390X.go
View File

@ -9847,11 +9847,11 @@ func rewriteValueS390X_OpS390XMOVDNE(v *Value, config *Config) bool {
v.AddArg(cmp)
return true
}
// match: (MOVDNE _ y (FlagEQ))
// match: (MOVDNE y _ (FlagEQ))
// cond:
// result: y
for {
y := v.Args[1]
y := v.Args[0]
v_2 := v.Args[2]
if v_2.Op != OpS390XFlagEQ {
break
@ -9861,11 +9861,11 @@ func rewriteValueS390X_OpS390XMOVDNE(v *Value, config *Config) bool {
v.AddArg(y)
return true
}
// match: (MOVDNE x _ (FlagLT))
// match: (MOVDNE _ x (FlagLT))
// cond:
// result: x
for {
x := v.Args[0]
x := v.Args[1]
v_2 := v.Args[2]
if v_2.Op != OpS390XFlagLT {
break
@ -9875,11 +9875,11 @@ func rewriteValueS390X_OpS390XMOVDNE(v *Value, config *Config) bool {
v.AddArg(x)
return true
}
// match: (MOVDNE x _ (FlagGT))
// match: (MOVDNE _ x (FlagGT))
// cond:
// result: x
for {
x := v.Args[0]
x := v.Args[1]
v_2 := v.Args[2]
if v_2.Op != OpS390XFlagGT {
break