[InstSimplify] allow icmp with constant folds for splat vectors, part 1
llvm-svn: 279538
diff --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp
index 5b78058..c048f31 100644
--- a/llvm/lib/Analysis/InstructionSimplify.cpp
+++ b/llvm/lib/Analysis/InstructionSimplify.cpp
@@ -2154,17 +2154,21 @@
static Value *simplifyICmpWithConstant(CmpInst::Predicate Pred, Value *LHS,
Value *RHS) {
- // FIXME: Use m_APInt here and below to allow splat vector folds.
- ConstantInt *CI = dyn_cast<ConstantInt>(RHS);
- if (!CI)
+ const APInt *C;
+ if (!match(RHS, m_APInt(C)))
return nullptr;
// Rule out tautological comparisons (eg., ult 0 or uge 0).
- ConstantRange RHS_CR = ICmpInst::makeConstantRange(Pred, CI->getValue());
+ ConstantRange RHS_CR = ICmpInst::makeConstantRange(Pred, *C);
if (RHS_CR.isEmptySet())
- return ConstantInt::getFalse(CI->getContext());
+ return ConstantInt::getFalse(GetCompareTy(RHS));
if (RHS_CR.isFullSet())
- return ConstantInt::getTrue(CI->getContext());
+ return ConstantInt::getTrue(GetCompareTy(RHS));
+
+ // FIXME: Use m_APInt below here to allow splat vector folds.
+ ConstantInt *CI = dyn_cast<ConstantInt>(RHS);
+ if (!CI)
+ return nullptr;
// Many binary operators with constant RHS have easy to compute constant
// range. Use them to check whether the comparison is a tautology.