| Issue |
91175
|
| Summary |
[lld] Optimize calling one instruction function?
|
| Labels |
lld
|
| Assignees |
|
| Reporter |
metarutaiga
|
Does the LLD have the optimization option to reduce calling function when linking?
```
./one.o: file format mach-o arm64
Disassembly of section __TEXT,__text:
0000000000000000 <ltmp0>:
0: b9400400 ldr w0, [x0, #4]
4: d65f03c0 ret
0000000000000008 <_bar>:
8: a9bf7bfd stp x29, x30, [sp, #-16]!
c: 910003fd mov x29, sp
10: 94000000 bl 0x10 <_bar+0x8>
14: 11000400 add w0, w0, #1
18: a8c17bfd ldp x29, x30, [sp], #16
1c: d65f03c0 ret
```
When the LLD found the one instruction function, we can replace it.
```
10: 94000000 bl 0x10 <_bar+0x8>
```
to
```
10: b9400400 ldr w0, [x0, #4]
```
I know the LTO is better than this, but I haven't LTO libraries sometimes.
And the Debugger would be not to set breakpoint.
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