| Issue |
165947
|
| Summary |
[AArch64] Suboptimal `memcpy` for non-power of two sizes
|
| Labels |
backend:AArch64,
missed-optimization
|
| Assignees |
|
| Reporter |
Kmeakin
|
Split off from https://github.com/llvm/llvm-project/issues/165625
https://godbolt.org/z/Yfq56nfTP
LLVM assembly:
```asm
copy65:
ldr q0, [x1]
str q0, [x0]
ldp q2, q0, [x1, #32]
ldrb w8, [x1, #64]
ldr q1, [x1, #16]
strb w8, [x0, #64]
stp q2, q0, [x0, #32]
str q1, [x0, #16]
ret
```
GCC assembly:
```asm
copy65:
ldp q29, q28, [x1]
ldp q31, q30, [x1, 32]
ldrb w1, [x1, 64]
stp q29, q28, [x0]
stp q31, q30, [x0, 32]
strb w1, [x0, 64]
ret
```
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