// We can always turn lshr(c1)+shl(c2) -> lshr(c3)+and(c4), but it isn't
// profitable unless we know the and'd out bits are already zero.
if (CI->getZExtValue() > NumBits) {
+ unsigned LowBits = CI->getZExtValue() - NumBits;
if (MaskedValueIsZero(I->getOperand(0),
- APInt::getLowBitsSet(TypeWidth, NumBits)))
+ APInt::getLowBitsSet(TypeWidth, NumBits) << LowBits))
return true;
}
; CHECK-NEXT: ret i32
}
+; <rdar://problem/8756731>
+; CHECK: @test39
+define i8 @test39(i32 %a0) {
+entry:
+ %tmp4 = trunc i32 %a0 to i8
+; CHECK: and i8 %tmp49, 64
+ %tmp5 = shl i8 %tmp4, 5
+ %tmp48 = and i8 %tmp5, 32
+ %tmp49 = lshr i8 %tmp48, 5
+ %tmp50 = mul i8 %tmp49, 64
+ %tmp51 = xor i8 %tmp50, %tmp5
+; CHECK: and i8 %0, 16
+ %tmp52 = and i8 %tmp51, -128
+ %tmp53 = lshr i8 %tmp52, 7
+ %tmp54 = mul i8 %tmp53, 16
+ %tmp55 = xor i8 %tmp54, %tmp51
+; CHECK: ret i8 %tmp551
+ ret i8 %tmp55
+}