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[x86] add test for missing vector SRA combine via computeKnownBits 

llvm-svn: 284896
This commit is contained in:
Sanjay Patel 2016-10-21 23:02:31 +00:00
parent ce76629905
commit 5b7767f646
1 changed files with 18 additions and 0 deletions
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18
llvm/test/CodeGen/X86/combine-sra.ll
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@ -296,3 +296,21 @@ define <4 x i32> @combine_vec_ashr_positive(<4 x i32> %x, <4 x i32> %y) {
%2 = ashr <4 x i32> %1, %y
ret <4 x i32> %2
}
define <4 x i32> @combine_vec_ashr_positive_splat(<4 x i32> %x, <4 x i32> %y) {
; SSE-LABEL: combine_vec_ashr_positive_splat:
; SSE: # BB#0:
; SSE-NEXT: pand {{.*}}(%rip), %xmm0
; SSE-NEXT: psrld $10, %xmm0
; SSE-NEXT: retq
;
; AVX-LABEL: combine_vec_ashr_positive_splat:
; AVX: # BB#0:
; AVX-NEXT: vpbroadcastd {{.*}}(%rip), %xmm1
; AVX-NEXT: vpand %xmm1, %xmm0, %xmm0
; AVX-NEXT: vpsrld $10, %xmm0, %xmm0
; AVX-NEXT: retq
%1 = and <4 x i32> %x, <i32 1023, i32 1023, i32 1023, i32 1023>
%2 = ashr <4 x i32> %1, <i32 10, i32 10, i32 10, i32 10>
ret <4 x i32> %2
}