[llvm] [RISCV][ISel] Add codegen support for the experimental zabha extension (PR #80192)
Craig Topper via llvm-commits
llvm-commits at lists.llvm.org
Wed Jan 31 15:39:18 PST 2024
================
@@ -629,7 +629,10 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
if (Subtarget.hasStdExtA()) {
setMaxAtomicSizeInBitsSupported(Subtarget.getXLen());
- setMinCmpXchgSizeInBits(32);
+ if (Subtarget.hasStdExtZabha())
+ setMinCmpXchgSizeInBits(8);
----------------
topperc wrote:
Is this accurate? We would need LR/SC for bytes and half words, or Zacas to be able to cmpxchg on 8 bits.
https://github.com/llvm/llvm-project/pull/80192
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