[TargetLowering] fix isConstTrueVal to account for build vector truncation
Build vectors have magical truncation powers, so we have things like this:
v4i1 = BUILD_VECTOR Constant:i32<1>, Constant:i32<1>, Constant:i32<1>, Constant:i32<1>
v4i16 = BUILD_VECTOR Constant:i32<1>, Constant:i32<1>, Constant:i32<1>, Constant:i32<1>
If we don't truncate the splat node returned by getConstantSplatNode(), then we won't find
truth when ZeroOrNegativeOneBooleanContent is the rule.
Differential Revision: https://reviews.llvm.org/D32505
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301408 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed