[VPlan] Rely on VPlan opts to simplify multiply by 1 (NFCI).

fhahn · fhahn · commit 21cca5ea9d13 · 2025-08-21T18:43:47.000+01:00
diff --git a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
@@ -3455,9 +3455,7 @@ void VPlanTransforms::materializeVFAndVFxUF(VPlan &Plan, VPBasicBlock *VectorPH,
   VF.replaceAllUsesWith(RuntimeVF);
 
   VPValue *UF = Plan.getOrAddLiveIn(ConstantInt::get(TCTy, Plan.getUF()));
-  VPValue *MulByUF = Plan.getUF() == 1 ? RuntimeVF
-                                       : Builder.createNaryOp(Instruction::Mul,
-                                                              {RuntimeVF, UF});
+  VPValue *MulByUF = Builder.createNaryOp(Instruction::Mul, {RuntimeVF, UF});
   VFxUF.replaceAllUsesWith(MulByUF);
 }
 

Original file line number	Diff line number	Diff line change
`@@ -3455,9 +3455,7 @@ void VPlanTransforms::materializeVFAndVFxUF(VPlan &Plan, VPBasicBlock *VectorPH,`
`3455`	`3455`	`VF.replaceAllUsesWith(RuntimeVF);`
`3456`	`3456`
`3457`	`3457`	`VPValue *UF = Plan.getOrAddLiveIn(ConstantInt::get(TCTy, Plan.getUF()));`
`3458`		`- VPValue *MulByUF = Plan.getUF() == 1 ? RuntimeVF`
`3459`		`- : Builder.createNaryOp(Instruction::Mul,`
`3460`		`- {RuntimeVF, UF});`
	`3458`	`+ VPValue *MulByUF = Builder.createNaryOp(Instruction::Mul, {RuntimeVF, UF});`
`3461`	`3459`	`VFxUF.replaceAllUsesWith(MulByUF);`
`3462`	`3460`	`}`
`3463`	`3461`