================
@@ -450,6 +450,37 @@ static bool isTriviallyUniform(const Use &U) {
return false;
}
+/// Simplify a lane index operand (e.g. llvm.amdgcn.readlane src1).
+///
+/// The instruction only reads the low 5 bits for wave32, and 6 bits for
wave64.
+bool GCNTTIImpl::simplifyDemandedLaneMaskArg(InstCombiner &IC,
+ IntrinsicInst &II,
+ unsigned LaneArgIdx) const {
+ unsigned MaskBits = ST->isWaveSizeKnown() && ST->isWave32() ? 5 : 6;
----------------
shiltian wrote:
If we default to 64, can't we just use `getWavefrontSize`?
https://github.com/llvm/llvm-project/pull/117963
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