if (ConstantInt *RHSC = dyn_cast<ConstantInt>(Op1)) {
if (BinaryOperator *Op0I = dyn_cast<BinaryOperator>(Op0)) {
// ~(c-X) == X-c-1 == X+(-c-1)
- if (Op0I->getOpcode() == Instruction::Sub && RHSC->isMinusOne())
- if (Constant *Op0I0C = dyn_cast<Constant>(Op0I->getOperand(0))) {
- Constant *NegOp0I0C = ConstantExpr::getNeg(Op0I0C);
- return BinaryOperator::CreateAdd(Op0I->getOperand(1),
- SubOne(NegOp0I0C));
+ if (Op0I->getOpcode() == Instruction::Sub)
+ if (ConstantInt *Op0I0C = dyn_cast<ConstantInt>(Op0I->getOperand(0))) {
+ if (RHSC->isMinusOne()) {
+ Constant *NegOp0I0C = ConstantExpr::getNeg(Op0I0C);
+ return BinaryOperator::CreateAdd(Op0I->getOperand(1),
+ SubOne(NegOp0I0C));
+ } else if (RHSC->getValue().isSignMask()) {
+ // (C - X) ^ signmask -> (C + signmask - X)
+ Constant *C = Builder.getInt(RHSC->getValue() + Op0I0C->getValue());
+ return BinaryOperator::CreateSub(C, Op0I->getOperand(1));
+ }
}
if (ConstantInt *Op0CI = dyn_cast<ConstantInt>(Op0I->getOperand(1))) {
// (X + C) ^ signmask -> (X + C + signmask)
Constant *C = Builder.getInt(RHSC->getValue() + Op0CI->getValue());
return BinaryOperator::CreateAdd(Op0I->getOperand(0), C);
-
}
} else if (Op0I->getOpcode() == Instruction::Or) {
// (X|C1)^C2 -> X^(C1|C2) iff X&~C1 == 0
ret i32 %t214
}
+define i32 @test28_sub(i32 %indvar) {
+; CHECK-LABEL: @test28_sub(
+; CHECK-NEXT: ret i32 -2147483648
+;
+ %t7 = sub i32 -2147483647, %indvar
+ %t214 = xor i32 %t7, -2147483648
+ ret i32 %t214
+}
+
define i32 @test29(i1 %C) {
; CHECK-LABEL: @test29(
; CHECK-NEXT: [[V:%.*]] = select i1 [[C:%.*]], i32 915, i32 113