[llvm] [RISCV][ISel] Add codegen support for the experimental zabha extension (PR #80192)
Jessica Clarke via llvm-commits
llvm-commits at lists.llvm.org
Wed Jan 31 22:10:50 PST 2024
================
@@ -629,7 +629,10 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
if (Subtarget.hasStdExtA()) {
setMaxAtomicSizeInBitsSupported(Subtarget.getXLen());
- setMinCmpXchgSizeInBits(32);
+ if (Subtarget.hasStdExtZabha())
+ setMinCmpXchgSizeInBits(8);
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jrtc27 wrote:
That came from https://github.com/llvm/llvm-project/commit/3291f9aa8168408ce5ef4757012c06c196a72c41, which seems slightly odd. Seems to be assuming shouldExpandAtomicRMWInIR doesn't return None, which it probably should be checking?
https://github.com/llvm/llvm-project/pull/80192
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