cmd/compile: use type information in Aux for Store size

Remove size AuxInt in Store, and alignment in Move/Zero. We still
pass size AuxInt to Move/Zero, as it is used for partial Move/Zero
lowering (e.g. cmd/compile/internal/ssa/gen/386.rules:288).
SizeAndAlign is gone.

Passes "toolstash -cmp" on std.

Change-Id: I1ca34652b65dd30de886940e789fcf41d521475d
Reviewed-on: https://go-review.googlesource.com/38150
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/cmd/compile/internal/ssa/func.go b/src/cmd/compile/internal/ssa/func.go
index fc7db290bf..a26c92ef87 100644
--- a/src/cmd/compile/internal/ssa/func.go
+++ b/src/cmd/compile/internal/ssa/func.go
@@ -352,6 +352,21 @@ func (b *Block) NewValue3I(pos src.XPos, op Op, t Type, auxint int64, arg0, arg1
 	return v
 }
 
+// NewValue3A returns a new value in the block with three argument and an aux value.
+func (b *Block) NewValue3A(pos src.XPos, op Op, t Type, aux interface{}, arg0, arg1, arg2 *Value) *Value {
+	v := b.Func.newValue(op, t, b, pos)
+	v.AuxInt = 0
+	v.Aux = aux
+	v.Args = v.argstorage[:3]
+	v.argstorage[0] = arg0
+	v.argstorage[1] = arg1
+	v.argstorage[2] = arg2
+	arg0.Uses++
+	arg1.Uses++
+	arg2.Uses++
+	return v
+}
+
 // NewValue4 returns a new value in the block with four arguments and zero aux values.
 func (b *Block) NewValue4(pos src.XPos, op Op, t Type, arg0, arg1, arg2, arg3 *Value) *Value {
 	v := b.Func.newValue(op, t, b, pos)