[llvm] [RISCV] Initial ISel support for the experimental zacas extension (PR #67918)
Craig Topper via llvm-commits
llvm-commits at lists.llvm.org
Mon Dec 4 21:33:20 PST 2023
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@@ -295,6 +295,28 @@ multiclass PseudoCmpXchgPat<string Op, Pseudo CmpXchgInst,
(CmpXchgInst GPR:$addr, GPR:$cmp, GPR:$new, 7)>;
}
+let Predicates = [HasStdExtZacas] in {
+class PseudoAMOCAS<RegisterClass RC = GPR>
+ : Pseudo<(outs RC:$res),
+ (ins GPR:$addr, RC:$cmpval, RC:$newval, ixlenimm:$ordering), []> {
+ let Constraints = "@earlyclobber $res, $res = $cmpval";
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topperc wrote:
Do we need earlyclobber?
https://github.com/llvm/llvm-project/pull/67918
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