As pointed out in #55342, given non-canonical IR with multiple
constants, we check the second operand in isSafeWrap, but can promote
both with sext. Fix that as suggested by @craig.topper by ensuring we
only extend the second constant if multiple are present.
Fixes #55342
Differential Revision: https://reviews.llvm.org/D125294
continue;
if (auto *Const = dyn_cast<ConstantInt>(Op)) {
- Constant *NewConst = SafeWrap.contains(I)
+ Constant *NewConst = (SafeWrap.contains(I) && i == 1)
? ConstantExpr::getSExt(Const, ExtTy)
: ConstantExpr::getZExt(Const, ExtTy);
I->setOperand(i, NewConst);
if.end:
ret void
}
+
+define i32 @degenerateicmp() {
+; CHECK-LABEL: @degenerateicmp(
+; CHECK-NEXT: [[TMP1:%.*]] = sub i32 190, 0
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ugt i32 225, [[TMP1]]
+; CHECK-NEXT: [[TMP3:%.*]] = select i1 [[TMP2]], i32 1, i32 0
+; CHECK-NEXT: ret i32 [[TMP3]]
+;
+ %1 = sub i8 -66, 0
+ %2 = icmp ugt i8 -31, %1
+ %3 = select i1 %2, i32 1, i32 0
+ ret i32 %3
+}