| Issue |
147935
|
| Summary |
[ARM] Incorrect __gnu_h2f_ieee ABI
|
| Labels |
backend:ARM,
miscompilation
|
| Assignees |
|
| Reporter |
nikic
|
```llvm
target triple = "arm-unknown-linux-gnueabihf"
define i1 @test(half %self) #0 {
%_0 = fcmp une half %self, %self
ret i1 %_0
}
attributes #0 = { "target-features"="+vfp2" }
```
Produces:
```asm
.save {r11, lr}
push {r11, lr}
vmov r0, s0
bl __gnu_h2f_ieee
vcmp.f32 s0, s0
mov r0, #0
vmrs APSR_nzcv, fpscr
movvs r0, #1
pop {r11, lr}
mov pc, lr
```
LLVM 20 produced the correct:
```asm
.save {r11, lr}
push {r11, lr}
vmov r0, s0
bl __gnu_h2f_ieee
vmov s0, r0
mov r0, #0
vcmp.f32 s0, s0
vmrs APSR_nzcv, fpscr
movvs r0, #1
pop {r11, lr}
mov pc, lr
```
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