Return None if +v not enabled

lukel97 · lukel97 · commit 34f34e279bd2 · 2025-07-15T02:11:41.000+08:00
diff --git a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
@@ -116,7 +116,8 @@ class RISCVTTIImpl final : public BasicTTIImplBase<RISCVTTIImpl> {
   }
   TailFoldingStyle
   getPreferredTailFoldingStyle(bool IVUpdateMayOverflow) const override {
-    return TailFoldingStyle::DataWithEVL;
+    return ST->hasVInstructions() ? TailFoldingStyle::DataWithEVL
+                                  : TailFoldingStyle::None;
   }
   std::optional<unsigned> getMaxVScale() const override;
   std::optional<unsigned> getVScaleForTuning() const override;

Original file line number	Diff line number	Diff line change
`@@ -116,7 +116,8 @@ class RISCVTTIImpl final : public BasicTTIImplBase<RISCVTTIImpl> {`
`116`	`116`	`}`
`117`	`117`	`TailFoldingStyle`
`118`	`118`	`getPreferredTailFoldingStyle(bool IVUpdateMayOverflow) const override {`
`119`		`- return TailFoldingStyle::DataWithEVL;`
	`119`	`+ return ST->hasVInstructions() ? TailFoldingStyle::DataWithEVL`
	`120`	`+ : TailFoldingStyle::None;`
`120`	`121`	`}`
`121`	`122`	`std::optional<unsigned> getMaxVScale() const override;`
`122`	`123`	`std::optional<unsigned> getVScaleForTuning() const override;`