================
@@ -6069,6 +6069,11 @@ foreach lmul = MxList in {
}
}
+// Used by -fzero-call-used-regs to zero out registers.
+let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
+def PseudoClearVR : Pseudo<(outs VR:$vd), (ins), []>,
+ PseudoInstExpansion<(VMV_V_I VR:$vd, 0)>;
----------------
LucasChollet wrote:
> Any particular reason why we use a pseudo here instead of emitting a
> PseudoVMV_V_I directly?
I started to use pseudos to bypass dead code optimizations that would otherwise
remove the clearing instructions. I tested your suggestion and vector
instructions don't seem to be affected in the same way, so I guess we could
emit PseudoVMV_V_I directly if this is preferred.
> I'm not sure if you need to specify uses=[VL, VType] here to prevent the
> pseudo from getting reordered past the vsetvli
Seems safer to have that, I added it.
https://github.com/llvm/llvm-project/pull/206206
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