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[dev.ssa] cmd/compile: make sure to keep offset and sym of MOV opcodes.

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MOVXload and MOVXstore opcodes have both an auxint offset
and an aux offset (a symbol name, like a local or arg or global).
Make sure we keep those values during rewrites.

Change-Id: Ic9fd61bf295b5d1457784c281079a4fb38f7ad3b
Reviewed-on: https://go-review.googlesource.com/13849
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Keith Randall 2015-08-23 21:14:25 -07:00
parent 5844603f14
commit 01490eb96c
4 changed files with 773 additions and 299 deletions
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5
src/cmd/compile/internal/ssa/rewrite.go
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@ -122,6 +122,8 @@ func addOff(x, y int64) int64 {
return z
}
// mergeSym merges two symbolic offsets. There is no real merging of
// offsets, we just pick the non-nil one.
func mergeSym(x, y interface{}) interface{} {
if x == nil {
return y
@ -132,6 +134,9 @@ func mergeSym(x, y interface{}) interface{} {
panic(fmt.Sprintf("mergeSym with two non-nil syms %s %s", x, y))
return nil
}
func canMergeSym(x, y interface{}) bool {
return x == nil || y == nil
}
func inBounds8(idx, len int64) bool { return int8(idx) >= 0 && int8(idx) < int8(len) }
func inBounds16(idx, len int64) bool { return int16(idx) >= 0 && int16(idx) < int16(len) }