[ConstnatFolding] Teach the folder how to fold ConstantVector
A ConstantVector can have ConstantExpr operands and vice versa.
However, the folder had no ability to fold ConstantVectors which, in
some cases, was an optimization barrier.
Instead, rephrase the folder in terms of Constants instead of
ConstantExprs and teach callers how to deal with failure.
llvm-svn: 277099
diff --git a/llvm/lib/Analysis/Lint.cpp b/llvm/lib/Analysis/Lint.cpp
index fdf5f55..0b374ba 100644
--- a/llvm/lib/Analysis/Lint.cpp
+++ b/llvm/lib/Analysis/Lint.cpp
@@ -680,9 +680,9 @@
if (Instruction *Inst = dyn_cast<Instruction>(V)) {
if (Value *W = SimplifyInstruction(Inst, *DL, TLI, DT, AC))
return findValueImpl(W, OffsetOk, Visited);
- } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
- if (Value *W = ConstantFoldConstantExpression(CE, *DL, TLI))
- if (W != V)
+ } else if (auto *C = dyn_cast<Constant>(V)) {
+ if (Value *W = ConstantFoldConstant(C, *DL, TLI))
+ if (W && W != V)
return findValueImpl(W, OffsetOk, Visited);
}