[llvm] Perform bitreverse using AVX512 GFNI for i32 and i64. (PR #81764)
Simon Pilgrim via llvm-commits
llvm-commits at lists.llvm.org
Wed Apr 10 09:25:29 PDT 2024
================
@@ -31332,6 +31337,21 @@ static SDValue LowerBITREVERSE(SDValue Op, const X86Subtarget &Subtarget,
if (VT.is256BitVector() && !Subtarget.hasInt256())
return splitVectorIntUnary(Op, DAG, DL);
+ // Lower i32/i64 to GFNI as vXi8 BITREVERSE + BSWAP
+ if (!VT.isVector()) {
+
+ assert ((VT.getScalarType() == MVT::i32) || (VT.getScalarType() == MVT::i64));
+
+ MVT SVT = VT.getScalarType();
----------------
RKSimon wrote:
Remove SVT - its guaranteed to be the same as VT
https://github.com/llvm/llvm-project/pull/81764
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