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[x86] add test for possible load scalarization fold; NFC 

This is a minimal test to show a transform proposed in D118376.
This commit is contained in:
Sanjay Patel 2022-01-28 08:33:00 -05:00
parent 6277b90992
commit e9768a2a44
1 changed files with 35 additions and 0 deletions
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35
llvm/test/CodeGen/X86/extractelement-load.ll
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@ -300,3 +300,38 @@ define void @subextract_broadcast_load_constant(<2 x i16>* nocapture %0, i16* no
store i16 %10, i16* %2, align 2 store i16 %10, i16* %2, align 2
ret void ret void
} }
define i32 @multi_use_load_scalarization(<4 x i32>* %p) {
; X32-SSE2-LABEL: multi_use_load_scalarization:
; X32-SSE2: # %bb.0:
; X32-SSE2-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X32-SSE2-NEXT: movdqu (%ecx), %xmm0
; X32-SSE2-NEXT: pcmpeqd %xmm1, %xmm1
; X32-SSE2-NEXT: movd %xmm0, %eax
; X32-SSE2-NEXT: psubd %xmm1, %xmm0
; X32-SSE2-NEXT: movdqa %xmm0, (%ecx)
; X32-SSE2-NEXT: retl
;
; X64-SSSE3-LABEL: multi_use_load_scalarization:
; X64-SSSE3: # %bb.0:
; X64-SSSE3-NEXT: movdqu (%rdi), %xmm0
; X64-SSSE3-NEXT: pcmpeqd %xmm1, %xmm1
; X64-SSSE3-NEXT: movd %xmm0, %eax
; X64-SSSE3-NEXT: psubd %xmm1, %xmm0
; X64-SSSE3-NEXT: movdqa %xmm0, (%rdi)
; X64-SSSE3-NEXT: retq
;
; X64-AVX-LABEL: multi_use_load_scalarization:
; X64-AVX: # %bb.0:
; X64-AVX-NEXT: vmovdqu (%rdi), %xmm0
; X64-AVX-NEXT: vpcmpeqd %xmm1, %xmm1, %xmm1
; X64-AVX-NEXT: vpsubd %xmm1, %xmm0, %xmm1
; X64-AVX-NEXT: vmovdqa %xmm1, (%rdi)
; X64-AVX-NEXT: vmovd %xmm0, %eax
; X64-AVX-NEXT: retq
%v = load <4 x i32>, <4 x i32>* %p, align 1
%v1 = add <4 x i32> %v, <i32 1, i32 1, i32 1, i32 1>
store <4 x i32> %v1, <4 x i32>* %p
%r = extractelement <4 x i32> %v, i64 0
ret i32 %r
}