[llvm] [RISCV] Vectorize phi for loop carried @llvm.vector.reduce.fadd (PR #78244)

[Craig Topper via llvm-commits]

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@@ -157,6 +155,9 @@ bool RISCVCodeGenPrepare::visitIntrinsicInst(IntrinsicInst &I) {
   Builder.SetInsertPoint(&I);
   I.setOperand(0, Builder.CreateExtractElement(VecPHI, (uint64_t)0));
 
+  if (PHI->hasNUses(0))
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topperc wrote:

use_empty()?

https://github.com/llvm/llvm-project/pull/78244