Reapply "SLPVectorizer: Ignore users that are insertelements we can reschedule them"

This commit reapplies 205018. After 205855 we should correctly vectorize
intrinsics.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205965 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 24 insertions, 0 deletions

diff --git a/test/Transforms/SLPVectorizer/X86/insert-element-build-vector.ll b/test/Transforms/SLPVectorizer/X86/insert-element-build-vector.ll
index 7537ea3b05..620292bdaf 100644
--- a/test/Transforms/SLPVectorizer/X86/insert-element-build-vector.ll
+++ b/test/Transforms/SLPVectorizer/X86/insert-element-build-vector.ll
@@ -195,6 +195,30 @@ define <4 x float> @simple_select_partial_vector(<4 x float> %a, <4 x float> %b,
   ret <4 x float> %rb
 }
 
+; Make sure that vectorization happens even if insertelements operations
+; must be rescheduled. The case here is from compiling Julia.
+define <4 x float> @reschedule_extract(<4 x float> %a, <4 x float> %b) {
+; CHECK-LABEL: @reschedule_extract(
+; CHECK: %1 = fadd <4 x float> %a, %b
+  %a0 = extractelement <4 x float> %a, i32 0
+  %b0 = extractelement <4 x float> %b, i32 0
+  %c0 = fadd float %a0, %b0
+  %v0 = insertelement <4 x float> undef, float %c0, i32 0
+  %a1 = extractelement <4 x float> %a, i32 1
+  %b1 = extractelement <4 x float> %b, i32 1
+  %c1 = fadd float %a1, %b1
+  %v1 = insertelement <4 x float> %v0, float %c1, i32 1
+  %a2 = extractelement <4 x float> %a, i32 2
+  %b2 = extractelement <4 x float> %b, i32 2
+  %c2 = fadd float %a2, %b2
+  %v2 = insertelement <4 x float> %v1, float %c2, i32 2
+  %a3 = extractelement <4 x float> %a, i32 3
+  %b3 = extractelement <4 x float> %b, i32 3
+  %c3 = fadd float %a3, %b3
+  %v3 = insertelement <4 x float> %v2, float %c3, i32 3
+  ret <4 x float> %v3
+}
+
 ; Check that cost model for vectorization takes credit for
 ; instructions that are erased.
 define <4 x float> @take_credit(<4 x float> %a, <4 x float> %b) {