Patch by Andrey Kuharev.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209902
91177308-0d34-0410-b5e6-
96231b3b80d8
const APInt &RA = Rem->getAPIntValue();
if (RA.isPowerOf2()) {
APInt LowBits = (RA - 1);
- KnownZero |= ~LowBits;
- computeKnownBits(Op.getOperand(0), KnownZero, KnownOne,Depth+1);
+ computeKnownBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth + 1);
+
+ // The upper bits are all zero, the lower ones are unchanged.
+ KnownZero = KnownZero2 | ~LowBits;
+ KnownOne = KnownOne2 & LowBits;
break;
}
}
--- /dev/null
+; RUN: llc -mtriple=x86_64-linux < %s | FileCheck %s
+define i32 @main() #0 {
+entry:
+ %a = alloca i32, align 4
+ store i32 1, i32* %a, align 4
+ %0 = load i32* %a, align 4
+ %or = or i32 1, %0
+ %and = and i32 1, %or
+ %rem = urem i32 %and, 1
+ %add = add i32 %rem, 1
+ ret i32 %add
+}
+; CHECK: $1, %eax
+; CHECK-NEXT: retq