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add test to show suboptimal load merging behavior

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240063 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel 2015-06-18 21:34:26 +00:00
parent 4ac9a2e70f
commit 438a6a0608
1 changed files with 25 additions and 0 deletions
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25
test/CodeGen/X86/unaligned-32-byte-memops.ll
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@ -75,6 +75,31 @@ define <8 x float> @combine_16_byte_loads_no_intrinsic(<4 x float>* %ptr) {
ret <8 x float> %v3
}
define <8 x float> @combine_16_byte_loads_aligned(<4 x float>* %ptr) {
;; FIXME: The first load is 32-byte aligned, so the second load should get merged.
; AVXSLOW-LABEL: combine_16_byte_loads_aligned:
; AVXSLOW: # BB#0:
; AVXSLOW-NEXT: vmovaps 48(%rdi), %xmm0
; AVXSLOW-NEXT: vinsertf128 $1, 64(%rdi), %ymm0, %ymm0
; AVXSLOW-NEXT: retq
;
; AVXFAST-LABEL: combine_16_byte_loads_aligned:
; AVXFAST: # BB#0:
; AVXFAST-NEXT: vmovaps 48(%rdi), %ymm0
; AVXFAST-NEXT: retq
;
; AVX2-LABEL: combine_16_byte_loads_aligned:
; AVX2: # BB#0:
; AVX2-NEXT: vmovaps 48(%rdi), %ymm0
; AVX2-NEXT: retq
%ptr1 = getelementptr inbounds <4 x float>, <4 x float>* %ptr, i64 3
%ptr2 = getelementptr inbounds <4 x float>, <4 x float>* %ptr, i64 4
%v1 = load <4 x float>, <4 x float>* %ptr1, align 32
%v2 = load <4 x float>, <4 x float>* %ptr2, align 1
%v3 = shufflevector <4 x float> %v1, <4 x float> %v2, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
ret <8 x float> %v3
}
; Swap the order of the shufflevector operands to ensure that the pattern still matches.
define <8 x float> @combine_16_byte_loads_no_intrinsic_swap(<4 x float>* %ptr) {