| Issue |
181495
|
| Summary |
[ARM] arm does not recognize manual sri
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
folkertdev
|
given
https://godbolt.org/z/qGeMc4K1W (derived from https://godbolt.org/z/9cf3ooM1o)
```llvm
define <2 x i32> @helper(<2 x i32> %a, <2 x i32> %b) unnamed_addr {
bb1:
%0 = and <2 x i32> %a, splat (i32 -536870912)
%1 = lshr <2 x i32> %b, splat (i32 3)
%2 = or disjoint <2 x i32> %1, %0
ret <2 x i32> %2
}
```
aarch64 optimizes this nicely into
```asm
helper:
sri v0.2s, v1.2s, #3
ret
```
but on arm we get the much longer
```asm
helper:
vmov.i32 d16, #0xe0000000
vshr.u32 d17, d1, #3
vand d16, d0, d16
vorr d0, d17, d16
bx lr
```
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