| commit | c138e6a4b23bf6e34a43e178fb4b09a13944f1d4 | |
| author | H. Peter Anvin <hpa@zytor.com> | |
| Thu, 22 Apr 2010 18:02:56 +0000 (22 11:02 -0700) | ||
| committer | H. Peter Anvin <hpa@zytor.com> | |
| Thu, 22 Apr 2010 18:02:56 +0000 (22 11:02 -0700) | ||
| tree | 2f750878ede20f6983e71763800fe8ba99b7f0d4 | treesnapshot (tar.gz zip) |
| parent | 671a19600cb99b7350728a0985dacd77af885a86 | commitdiff |
ilog2: optimize use of bsr for x86-64
On x86-64 platforms, we can rely on BSR not changing the destination
operand when the input is zero.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
On x86-64 platforms, we can rely on BSR not changing the destination
operand when the input is zero.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| ilog2.c | diffblobblamehistory |