https://bugs.llvm.org/show_bug.cgi?id=39454
Bug ID: 39454
Summary: [X86] f64->v2f64 broadcasts should be split into
MOVDUP+SUBV_BROADCAST before isel instead of with an
isel pattern
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: craig.top...@gmail.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org
This would allow the load to folded into MOVDDUP here properly.
>From broadcast-elm-cross-splat-vec.ll
; AVX-64-LABEL: f64xi8_i64:
; AVX-64: # %bb.0:
; AVX-64-NEXT: vextractf128 $1, %ymm1, %xmm2
; AVX-64-NEXT: vmovsd {{.*#+}} xmm3 = mem[0],zero
; AVX-64-NEXT: vmovddup {{.*#+}} xmm3 = xmm3[0,0]
; AVX-64-NEXT: vpaddb %xmm3, %xmm2, %xmm2
; AVX-64-NEXT: vpaddb %xmm3, %xmm1, %xmm1
; AVX-64-NEXT: vinsertf128 $1, %xmm2, %ymm1, %ymm1
; AVX-64-NEXT: vextractf128 $1, %ymm0, %xmm2
; AVX-64-NEXT: vpaddb %xmm3, %xmm2, %xmm2
; AVX-64-NEXT: vpaddb %xmm3, %xmm0, %xmm0
; AVX-64-NEXT: vinsertf128 $1, %xmm2, %ymm0, %ymm0
; AVX-64-NEXT: vinsertf128 $1, %xmm3, %ymm3, %ymm2
; AVX-64-NEXT: vandps %ymm2, %ymm0, %ymm0
; AVX-64-NEXT: vandps %ymm2, %ymm1, %ymm1
; AVX-64-NEXT: retq
This issue was exposed by D53268 which removed the promotion of and/or/xor to
vXi64.
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