| Issue |
170529
|
| Summary |
[builtins] __truncxfhf2 incorrect values compared to --rtlib=libgcc
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
gorgew
|
The value of `__truncxfhf2` for casting long double to __fp16 appears to be incorrect with `--rtlib=compiler-rt` to `--rtlib=libgcc`, at least on x86_64 on llvm 21. This is also without `-mf16c`, though it does seem to happen with it as well.
Example program:
`
int main(void)
{
__fp16 h = 0.0f16;
long double ld = 12.34l;
h = ld;
return 0;
}
`
Compiled with clang++ and `-g --rtlib=libgcc`, in GDB I see that the value after the cast is
`
(gdb) p h
$1 = 12.344
`
which seems reasonable.
However, with '-g --rtlib=compiler-rt', I see that the value after the cast is
`
(gdb) p h
$1 = 9504
`
which is an unreasonable value.
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