return false;
}
- // Adding a power of two to the same power of two is a power of two or zero.
- if (OrZero && match(V, m_Add(m_Value(X), m_Value(Y)))) {
- if (match(X, m_And(m_Value(), m_Specific(Y)))) {
- if (isKnownToBeAPowerOfTwo(Y, /*OrZero*/true, Depth))
- return true;
- } else if (match(Y, m_And(m_Value(), m_Specific(X)))) {
- if (isKnownToBeAPowerOfTwo(X, /*OrZero*/true, Depth))
- return true;
- }
- }
+ if (match(V, m_Add(m_Value(X), m_Value(Y))))
+ if (OverflowingBinaryOperator *VOBO = cast<OverflowingBinaryOperator>(V))
+ if (OrZero || VOBO->hasNoUnsignedWrap() || VOBO->hasNoSignedWrap()) {
+ // Adding a power of two to the same power of two is a power of two or
+ // zero.
+ if (BinaryOperator *XBO = dyn_cast<BinaryOperator>(X))
+ if (XBO->getOpcode() == Instruction::And ||
+ XBO->getOpcode() == Instruction::Xor)
+ if (XBO->getOperand(0) == Y || XBO->getOperand(1) == Y)
+ if (isKnownToBeAPowerOfTwo(Y, /*OrZero*/true, Depth))
+ return true;
+ if (BinaryOperator *YBO = dyn_cast<BinaryOperator>(Y))
+ if (YBO->getOpcode() == Instruction::And ||
+ YBO->getOpcode() == Instruction::Xor)
+ if (YBO->getOperand(0) == X || YBO->getOperand(1) == X)
+ if (isKnownToBeAPowerOfTwo(X, /*OrYero*/true, Depth))
+ return true;
+ }
// An exact divide or right shift can only shift off zero bits, so the result
// is a power of two only if the first operand is a power of two and not
%rem = urem i32 %x, %add
ret i32 %rem
}
+
+define i32 @test17(i16 %x, i32 %y) {
+; CHECK: @test17
+; CHECK-NEXT: [[AND:%.*]] = and i16 %x, 4
+; CHECK-NEXT: [[EXT:%.*]] = zext i16 [[AND]] to i32
+; CHECK-NEXT: [[SHL:%.*]] = shl nuw nsw i32 [[EXT]], 3
+; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[SHL]], 63
+; CHECK-NEXT: [[REM:%.*]] = and i32 [[XOR]], %y
+; CHECK-NEXT: ret i32 [[REM]]
+ %1 = and i16 %x, 4
+ %2 = icmp ne i16 %1, 0
+ %3 = select i1 %2, i32 32, i32 64
+ %4 = urem i32 %y, %3
+ ret i32 %4
+}