[llvm-branch-commits] [RISCV] Support memcmp expansion for vectors (PR #114517)

[Craig Topper via llvm-branch-commits]

================
@@ -2504,5 +2504,10 @@ RISCVTTIImpl::enableMemCmpExpansion(bool OptSize, bool 
IsZeroCmp) const {
     Options.LoadSizes = {8, 4, 2, 1};
   else
     Options.LoadSizes = {4, 2, 1};
+  if (IsZeroCmp && ST->hasVInstructions()) {
+    unsigned RealMinVLen = ST->getRealMinVLen() / 8;
+    for (int LMUL = 1; LMUL <= 8; LMUL *= 2)
----------------
topperc wrote:

Why do we want to limit this to LMUL>=1? Shouldn't we be able to do this for 
small vectors even when VLEN is large?

https://github.com/llvm/llvm-project/pull/114517
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