[llvm] [X86] Use GFNI for vXi8 shifts/rotates (PR #89115)
Simon Pilgrim via llvm-commits
llvm-commits at lists.llvm.org
Thu Apr 18 10:02:10 PDT 2024
================
@@ -29175,6 +29198,14 @@ static SDValue LowerShiftByScalarImmediate(SDValue Op, SelectionDAG &DAG,
if (VT == MVT::v16i8 && Subtarget.hasXOP())
return SDValue();
+ if (Subtarget.hasGFNI()) {
----------------
RKSimon wrote:
No - 512-bit GFNI don't require BWI (although it will fail to use the mask predicates - see [avx512-gfni-intrinsics.ll](https://github.com/llvm/llvm-project/blob/main/llvm/test/CodeGen/X86/avx512-gfni-intrinsics.ll)).
I've added test coverage to ensure we track this
https://github.com/llvm/llvm-project/pull/89115
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