case Instruction::Or:
case Instruction::Xor:
case Instruction::Add:
+ case Instruction::Sub:
case Instruction::Mul: {
Constant *C;
+ if (match(BinOp0, m_Constant(C))) {
+ // trunc (binop C, X) --> binop (trunc C', X)
+ Constant *NarrowC = ConstantExpr::getTrunc(C, DestTy);
+ Value *TruncX = Builder.CreateTrunc(BinOp1, DestTy);
+ return BinaryOperator::Create(BinOp->getOpcode(), NarrowC, TruncX);
+ }
if (match(BinOp1, m_Constant(C))) {
// trunc (binop X, C) --> binop (trunc X, C')
Constant *NarrowC = ConstantExpr::getTrunc(C, DestTy);
}
break;
}
- case Instruction::Sub: {
- Constant *C;
- if (match(BinOp0, m_Constant(C))) {
- // trunc (binop C, X) --> binop (trunc C', X)
- Constant *NarrowC = ConstantExpr::getTrunc(C, DestTy);
- Value *TruncX = Builder.CreateTrunc(BinOp1, DestTy);
- return BinaryOperator::Create(BinOp->getOpcode(), NarrowC, TruncX);
- }
- break;
- }
default: break;
}
define i16 @narrow_sext_sub(i16 %x16, i32 %y32) {
; CHECK-LABEL: @narrow_sext_sub(
-; CHECK-NEXT: [[X321:%.*]] = zext i16 %x16 to i32
-; CHECK-NEXT: [[B:%.*]] = sub i32 [[X321]], %y32
-; CHECK-NEXT: [[R:%.*]] = trunc i32 [[B]] to i16
+; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 %y32 to i16
+; CHECK-NEXT: [[R:%.*]] = sub i16 %x16, [[TMP1]]
; CHECK-NEXT: ret i16 [[R]]
;
%x32 = sext i16 %x16 to i32
define i16 @narrow_zext_sub(i16 %x16, i32 %y32) {
; CHECK-LABEL: @narrow_zext_sub(
-; CHECK-NEXT: [[X32:%.*]] = zext i16 %x16 to i32
-; CHECK-NEXT: [[B:%.*]] = sub i32 [[X32]], %y32
-; CHECK-NEXT: [[R:%.*]] = trunc i32 [[B]] to i16
+; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 %y32 to i16
+; CHECK-NEXT: [[R:%.*]] = sub i16 %x16, [[TMP1]]
; CHECK-NEXT: ret i16 [[R]]
;
%x32 = zext i16 %x16 to i32
define <2 x i16> @narrow_sext_sub_commute(<2 x i16> %x16, <2 x i32> %y32) {
; CHECK-LABEL: @narrow_sext_sub_commute(
; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> %y32, <i32 7, i32 -17>
-; CHECK-NEXT: [[X321:%.*]] = zext <2 x i16> %x16 to <2 x i32>
-; CHECK-NEXT: [[B:%.*]] = sub <2 x i32> [[Y32OP0]], [[X321]]
-; CHECK-NEXT: [[R:%.*]] = trunc <2 x i32> [[B]] to <2 x i16>
+; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
+; CHECK-NEXT: [[R:%.*]] = sub <2 x i16> [[TMP1]], %x16
; CHECK-NEXT: ret <2 x i16> [[R]]
;
%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
define <2 x i16> @narrow_zext_sub_commute(<2 x i16> %x16, <2 x i32> %y32) {
; CHECK-LABEL: @narrow_zext_sub_commute(
; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> %y32, <i32 7, i32 -17>
-; CHECK-NEXT: [[X32:%.*]] = zext <2 x i16> %x16 to <2 x i32>
-; CHECK-NEXT: [[B:%.*]] = sub <2 x i32> [[Y32OP0]], [[X32]]
-; CHECK-NEXT: [[R:%.*]] = trunc <2 x i32> [[B]] to <2 x i16>
+; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
+; CHECK-NEXT: [[R:%.*]] = sub <2 x i16> [[TMP1]], %x16
; CHECK-NEXT: ret <2 x i16> [[R]]
;
%y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>