commit 7a6de6d5f2e1e8e8908022789cf129581c90a4c3
author Alexandru Moșoi <mosoi@google.com> Fri Aug 14 13:23:11 2015 +0200
committer Keith Randall <khr@golang.org> Fri Aug 14 20:47:21 2015 +0000
tree 1a28bd2f3df14891aa9b90cac4e4e2c671a336de
parent c55870a5412fb374c9c392a06c3949b291c48e15

[dev.ssa] cmd/compile/internal/ssa/gen: fold Mul8 properly.

Mul8 is lowered to MULW, but the rules for constant
folding do not handle the fact that the operands
are int8.

Change-Id: I2c336686d86249393a8079a471c6ff74e6228f3d
Reviewed-on: https://go-review.googlesource.com/13642
Reviewed-by: Keith Randall <khr@golang.org>

src/cmd/compile/internal/gc/ssa.go

diff --git a/src/cmd/compile/internal/gc/ssa.go b/src/cmd/compile/internal/gc/ssa.go
index 882efc0..ef6ca69 100644
--- a/src/cmd/compile/internal/gc/ssa.go
+++ b/src/cmd/compile/internal/gc/ssa.go
@@ -1909,7 +1909,7 @@
 		ssa.OpAMD64ANDQ, ssa.OpAMD64ANDL, ssa.OpAMD64ANDW, ssa.OpAMD64ANDB,
 		ssa.OpAMD64ORQ, ssa.OpAMD64ORL, ssa.OpAMD64ORW, ssa.OpAMD64ORB,
 		ssa.OpAMD64XORQ, ssa.OpAMD64XORL, ssa.OpAMD64XORW, ssa.OpAMD64XORB,
-		ssa.OpAMD64MULQ, ssa.OpAMD64MULL, ssa.OpAMD64MULW:
+		ssa.OpAMD64MULQ, ssa.OpAMD64MULL, ssa.OpAMD64MULW, ssa.OpAMD64MULB:
 		r := regnum(v)
 		x := regnum(v.Args[0])
 		y := regnum(v.Args[1])
@@ -1996,7 +1996,7 @@
 		p.From.Offset = v.AuxInt
 		p.To.Type = obj.TYPE_REG
 		p.To.Reg = regnum(v)
-	case ssa.OpAMD64MULQconst, ssa.OpAMD64MULLconst, ssa.OpAMD64MULWconst:
+	case ssa.OpAMD64MULQconst, ssa.OpAMD64MULLconst, ssa.OpAMD64MULWconst, ssa.OpAMD64MULBconst:
 		r := regnum(v)
 		x := regnum(v.Args[0])
 		if r != x {