[LV] Ensure reverse interleaved group GEPs remain uniform
For uniform instructions, we're only required to generate a scalar value for
the first vector lane of each unroll iteration. Thus, if we have a reverse
interleaved group, computing the member index off the scalar GEP corresponding
to the last vector lane of its pointer operand technically makes the GEP
non-uniform. We should compute the member index off the first scalar GEP
instead.
I've added the updated member index computation to the existing reverse
interleaved group test.
llvm-svn: 280497
diff --git a/llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll b/llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll
index 3499878..d84dc42 100644
--- a/llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll
+++ b/llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll
@@ -244,17 +244,23 @@
; }
; CHECK-LABEL: @test_reversed_load2_store2(
-; CHECK: %wide.vec = load <8 x i32>, <8 x i32>* {{.*}}, align 4
+; CHECK: %[[G0:.+]] = getelementptr inbounds %struct.ST2, %struct.ST2* %A, i64 %offset.idx, i32 0
+; CHECK: %[[G1:.+]] = getelementptr i32, i32* %[[G0]], i64 -6
+; CHECK: %[[B0:.+]] = bitcast i32* %[[G1]] to <8 x i32>*
+; CHECK: %wide.vec = load <8 x i32>, <8 x i32>* %[[B0]], align 4
; CHECK: shufflevector <8 x i32> %wide.vec, <8 x i32> undef, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
; CHECK: shufflevector <4 x i32> {{.*}}, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK: shufflevector <8 x i32> %wide.vec, <8 x i32> undef, <4 x i32> <i32 1, i32 3, i32 5, i32 7>
; CHECK: shufflevector <4 x i32> {{.*}}, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK: add nsw <4 x i32>
; CHECK: sub nsw <4 x i32>
+; CHECK: %[[G2:.+]] = getelementptr inbounds %struct.ST2, %struct.ST2* %B, i64 %offset.idx, i32 1
+; CHECK: %[[G3:.+]] = getelementptr i32, i32* %[[G2]], i64 -7
+; CHECK: %[[B1:.+]] = bitcast i32* %[[G3]] to <8 x i32>*
; CHECK: shufflevector <4 x i32> {{.*}}, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK: shufflevector <4 x i32> {{.*}}, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK: %interleaved.vec = shufflevector <4 x i32> {{.*}}, <8 x i32> <i32 0, i32 4, i32 1, i32 5, i32 2, i32 6, i32 3, i32 7>
-; CHECK: store <8 x i32> %interleaved.vec, <8 x i32>* %{{.*}}, align 4
+; CHECK: store <8 x i32> %interleaved.vec, <8 x i32>* %[[B1]], align 4
%struct.ST2 = type { i32, i32 }