CanEvaluateInDifferentType(I->getOperand(1), Ty, CastOpc,
NumCastsRemoved);
+ case Instruction::Mul:
+ break;
+ // A multiply can be truncated by truncating its operands.
+ return Ty->getBitWidth() < OrigTy->getBitWidth() &&
+ CanEvaluateInDifferentType(I->getOperand(0), Ty, CastOpc,
+ NumCastsRemoved) &&
+ CanEvaluateInDifferentType(I->getOperand(1), Ty, CastOpc,
+ NumCastsRemoved);
+
case Instruction::Shl:
// If we are truncating the result of this SHL, and if it's a shift of a
// constant amount, we can always perform a SHL in a smaller type.
switch (I->getOpcode()) {
case Instruction::Add:
case Instruction::Sub:
+ case Instruction::Mul:
case Instruction::And:
case Instruction::Or:
case Instruction::Xor:
--- /dev/null
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | notcast
+
+define i16 @test1(i16 %a) {
+ %tmp = zext i16 %a to i32 ; <i32> [#uses=2]
+ %tmp21 = lshr i32 %tmp, 8 ; <i32> [#uses=1]
+ %tmp5 = mul i32 %tmp, 5 ; <i32> [#uses=1]
+ %tmp.upgrd.32 = or i32 %tmp21, %tmp5 ; <i32> [#uses=1]
+ %tmp.upgrd.3 = trunc i32 %tmp.upgrd.32 to i16 ; <i16> [#uses=1]
+ ret i16 %tmp.upgrd.3
+}
+