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| author | Alan Modra <amodra@gmail.com> | 2013-08-17 18:46:05 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2013-10-04 10:40:22 +0930 |
| commit | 664318c3eb07032e2bfcf47cb2aa3c89280c19e7 (patch) | |
| tree | 338e8a4e5b1215319560caa795ce5830f2f46685 /conf/portability.h | |
| parent | 43b84013714c46e6dcae4a5564c5527777ad5e08 (diff) | |
| download | glibc-664318c3eb07032e2bfcf47cb2aa3c89280c19e7.tar.gz glibc-664318c3eb07032e2bfcf47cb2aa3c89280c19e7.tar.xz glibc-664318c3eb07032e2bfcf47cb2aa3c89280c19e7.zip | |
PowerPC LE strchr
http://sourceware.org/ml/libc-alpha/2013-08/msg00101.html Adds little-endian support to optimised strchr assembly. I've also tweaked the big-endian code a little. In power7/strchr.S there's a check in the tail of the function that we didn't match 0 before finding a c match, done by comparing leading zero counts. It's just as valid, and quicker, to compare the raw output from cmpb. Another little tweak is to use rldimi/insrdi in place of rlwimi for the power7 strchr functions. Since rlwimi is cracked, it is a few cycles slower. rldimi can be used on the 32-bit power7 functions too. * sysdeps/powerpc/powerpc64/power7/strchr.S (strchr): Add little-endian support. Correct typos, formatting. Optimize tail. Use insrdi rather than rlwimi. * sysdeps/powerpc/powerpc32/power7/strchr.S: Likewise. * sysdeps/powerpc/powerpc64/power7/strchrnul.S (__strchrnul): Add little-endian support. Correct typos. * sysdeps/powerpc/powerpc32/power7/strchrnul.S: Likewise. Use insrdi rather than rlwimi. * sysdeps/powerpc/powerpc64/strchr.S (rTMP4, rTMP5): Define. Use in loop and entry code to keep "and." results. (strchr): Add little-endian support. Comment. Move cntlzd earlier in tail. * sysdeps/powerpc/powerpc32/strchr.S: Likewise.
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