[issue1770] Patch for i386 to use bsrl for libc fls().

看板DFBSD_submit作者時間15年前 (2010/05/26 13:32), 編輯推噓0(0推 0噓 0→)
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--===============0476711215== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Venkatesh Srinivas <me@acm.jhu.edu> added the comment: Hi, This is an improved version of the patch that corrects my silly jz mistake = and=20 adds ffsl and flsl. It also implements both for x86_64. The x86-64 version = is=20 branchless, using cmov. This alternate snippet may be better and would allow for a branchless f?f(l= ) on=20 i386, except bsr and bsf are defined differently on Intel and AMD x86 machi= nes.=20 It may be better on x86_64 than the cmov-based version: xorl %eax, %eax xorl %ecx, %ecx bsrl 4(%esp), %eax setnz %cl addl %ecx, %eax ret Thanks, -- vs _____________________________________________________ DragonFly issue tracker <bugs@lists.dragonflybsd.org> <http://bugs.dragonflybsd.org/issue1770> _____________________________________________________ --===============0476711215== Content-Type: application/octet-stream MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="0001-libc-Add-assembler-ffs-fls-ffsl-flsl-to-i386-and.patch" RnJvbSBjYWFlZTc0NWE5YTk4YmI3OTRhNWViYTkyOGRlMTJhYjk1MzA3M2FjIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBWZW5rYXRlc2ggU3Jpbml2YXMgPG1lQGVuZGVhdm91ci56YXB0 by5vcmc+CkRhdGU6IFdlZCwgMjYgTWF5IDIwMTAgMDE6MDg6NTQgLTA0MDAKU3ViamVjdDogW1BB 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