| Issue |
136848
|
| Summary |
[x86] Unable to fold table lookup into tail call
|
| Labels |
backend:X86
|
| Assignees |
|
| Reporter |
zmodem
|
Reported by @haberman
Consider:
```
typedef void Func(void *table, long idx);
void ExtraMov(Func** table, long idx) {
return table[idx](table, idx);
}
```
Actual output:
```
ExtraMov(void (**)(void*, long), long):
mov rax, qword ptr [rdi + 8*rsi]
jmp rax
```
Desired output:
```
ExtraMov(void (**)(void*, long), long):
jmp qword ptr [rdi + 8*rsi]
```
(GCC can do it: https://godbolt.org/z/73rGW9M45)
(For 32-bit x86 we get it right, but only for -fno-pic; for -fpic we get confused: https://godbolt.org/z/1e9s787Gr)
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