| Issue |
129056
|
| Summary |
[X86] Failure to merge PINSRW insertions
|
| Labels |
backend:X86,
missed-optimization
|
| Assignees |
|
| Reporter |
RKSimon
|
```ll
define <16 x i16> @ff(<16 x i16> %x, i16 %s) {
%i0 = insertelement <16 x i16> %x, i16 %s, i32 0
%i1 = insertelement <16 x i16> %i0, i16 %s, i32 8
ret <16 x i16> %i1
}
```
llc -mcpu=x86-64-v3
```asm
ff: # @ff
vpinsrw $0, %edi, %xmm0, %xmm1
vpblendd $15, %ymm1, %ymm0, %ymm0 # ymm0 = ymm1[0,1,2,3],ymm0[4,5,6,7]
vmovd %edi, %xmm1
vpbroadcastw %xmm1, %ymm1
vpblendw $1, %ymm1, %ymm0, %ymm1 # ymm1 = ymm1[0],ymm0[1,2,3,4,5,6,7],ymm1[8],ymm0[9,10,11,12,13,14,15]
vpblendd $240, %ymm1, %ymm0, %ymm0 # ymm0 = ymm0[0,1,2,3],ymm1[4,5,6,7]
retq
```
This should just perform the vmovd+vpbroadcastw to transfer %edi once
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