| commit | 079b20e89d3c511716bafb3369336e2b1c165bd5 | |
| author | Xi Ruoyao <xry111@xry111.site> | |
| Mon, 7 Aug 2023 11:07:08 +0000 (7 13:07 +0200) | ||
| committer | Alan Modra <amodra@gmail.com> | |
| Sat, 12 Aug 2023 00:28:22 +0000 (12 09:58 +0930) | ||
| tree | a15f0626d489f986241b536983c3c3ce0a73cae8 | treesnapshot (tar.gz zip) |
| parent | 82fc3423c36c2cdc413910dac2e3c9faf0c59967 | commitdiff |
LoongArch: implement count_{leading,trailing}_zeros
LoongArch always support clz and ctz instructions, so we can always use
__builtin_{clz,ctz} for count_{leading,trailing}_zeros. This improves
the code of libgcc, and also benefits Glibc once we merge longlong.h
there.
Bootstrapped and regtested on loongarch64-linux-gnu.
include/
* longlong.h [__loongarch__] (count_leading_zeros): Define.
[__loongarch__] (count_trailing_zeros): Likewise.
[__loongarch__] (COUNT_LEADING_ZEROS_0): Likewise.
LoongArch always support clz and ctz instructions, so we can always use
__builtin_{clz,ctz} for count_{leading,trailing}_zeros. This improves
the code of libgcc, and also benefits Glibc once we merge longlong.h
there.
Bootstrapped and regtested on loongarch64-linux-gnu.
include/
* longlong.h [__loongarch__] (count_leading_zeros): Define.
[__loongarch__] (count_trailing_zeros): Likewise.
[__loongarch__] (COUNT_LEADING_ZEROS_0): Likewise.
| include/longlong.h | diffblobblamehistory |