================
@@ -19,6 +19,7 @@ bool DirectXTTIImpl::isTargetIntrinsicWithScalarOpAtArg(
Intrinsic::ID ID, unsigned ScalarOpdIdx) const {
switch (ID) {
case Intrinsic::dx_wave_readlane:
+ case Intrinsic::dx_quad_read_lane_at:
----------------
kcloudy0717 wrote:
I did some digging and yes, this is required for QuadReadLaneAt intrinsic.
`isTargetIntrinsicWithScalarOpAtArg` is called by the Scalarizer pass:
https://github.com/llvm/llvm-project/blob/797ead5fc79645a09a22d72e13912bf7e7c8d884/llvm/lib/Transforms/Scalar/Scalarizer.cpp#L792-L798
Without the case, the function returns false for operand 1 (the index param),
and the Scalarizer would fall into the else branch — but the i32 %idx operand
was never scattered (it's not a vector), so Scattered[J] is an empty Scatterer
and indexing it causes access violation.
https://github.com/llvm/llvm-project/pull/205735
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