================
@@ -1687,6 +1692,46 @@ static void WriteConstantInternal(raw_ostream &Out,
const Constant *CV,
return;
}
+ // When in the mode where Constant{Int,FP} do not support vector types the
+ // "splat(Ty val)" syntax is interpreted as a ConstantDataVector. Maintaining
+ // this association when outputiing the IR will significantly reduce the
+ // output changes when in the mode where Constant{Int,FP} do support vector
+ // types. In turn this should make it easier to spot difference in output
+ // when switching between the modes. Once the transition is complete this
+ // code will be removed.
+ if (const ConstantDataVector *CDV = dyn_cast<ConstantDataVector>(CV)) {
+ if (auto *SplatVal = CDV->getSplatValue()) {
+ Type* EltTy = SplatVal->getType();
+
+ if (EltTy->isIntegerTy() && !UseConstantIntForFixedLengthSplat) {
----------------
paulwalker-arm wrote:
As predicted the conditions did not affect the behaviour and have been removed.
The one place where constants are still printed as `<Ty V1, Ty V2...>` is
shufflevector masks, which go down a dedicated path. I've kept this as is for
now because figure non-zero splat masks are rare and
`ShuffleVectorInst::isValidOperands` currently rejects `ConstantInt` anyway.
https://github.com/llvm/llvm-project/pull/112548
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