[llvm] [VPlan] Remove loop region in optimizeForVFAndUF. (PR #108378)

[via llvm-commits]

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@@ -80,15 +80,13 @@ define void @powi_call(ptr %P) {
 ; CHECK:       [[VECTOR_PH]]:
 ; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
 ; CHECK:       [[VECTOR_BODY]]:
-; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
-; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds double, ptr [[P]], i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds double, ptr [[P]], i64 0
 ; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds double, ptr [[TMP1]], i32 0
 ; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <2 x double>, ptr [[TMP2]], align 8
 ; CHECK-NEXT:    [[TMP3:%.*]] = call <2 x double> @llvm.powi.v2f64.i32(<2 x double> [[WIDE_LOAD]], i32 3)
-; CHECK-NEXT:    store <2 x double> [[TMP3]], ptr [[TMP2]], align 8
-; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
-; CHECK-NEXT:    br i1 true, label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
+; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds double, ptr [[TMP1]], i32 0
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ayalz wrote:

Better (continue to) reuse TMP2 instead of replicating it?

https://github.com/llvm/llvm-project/pull/108378