[llvm-branch-commits] [llvm] [RISCV][MC] Warn if SEW/LMUL may not be compatible (PR #94313)

[Luke Lau via llvm-branch-commits]

================
@@ -2211,6 +2222,16 @@ ParseStatus RISCVAsmParser::parseVTypeI(OperandVector 
&Operands) {
 
   if (getLexer().is(AsmToken::EndOfStatement) && State == VTypeState_Done) {
     RISCVII::VLMUL VLMUL = RISCVVType::encodeLMUL(Lmul, Fractional);
+    if (Fractional) {
+      unsigned ELEN = STI->hasFeature(RISCV::FeatureStdExtZve64x) ? 64 : 32;
+      unsigned MaxSEW = ELEN / Lmul;
+      // If MaxSEW < 8, we should have printed warning about reserved LMUL.
+      if (MaxSEW >= 8 && Sew > MaxSEW)
+        Warning(SEWLoc,
+                "use of vtype encodings with SEW > " + Twine(MaxSEW) +
+                    " and LMUL == " + (Fractional ? "mf" : "m") + Twine(Lmul) +
----------------
lukel97 wrote:

Fractional is always true here right?

https://github.com/llvm/llvm-project/pull/94313
_______________________________________________
llvm-branch-commits mailing list
llvm-branch-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-branch-commits