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| author | Alan Modra <amodra@gmail.com> | 2013-08-17 18:41:17 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2013-10-04 10:39:52 +0930 |
| commit | 8a7413f9b036da83ffde491a37d9d2340bc321a7 (patch) | |
| tree | 8ba04b78fde9893b9da3a10e7934a2c127594f6e /sysdeps/powerpc/powerpc32/strcmp.S | |
| parent | 33ee81de05e83ce12f32a491270bb4c1611399c7 (diff) | |
| download | glibc-8a7413f9b036da83ffde491a37d9d2340bc321a7.tar.gz glibc-8a7413f9b036da83ffde491a37d9d2340bc321a7.tar.xz glibc-8a7413f9b036da83ffde491a37d9d2340bc321a7.zip | |
PowerPC LE strcmp and strncmp
http://sourceware.org/ml/libc-alpha/2013-08/msg00099.html More little-endian support. I leave the main strcmp loops unchanged, (well, except for renumbering rTMP to something other than r0 since it's needed in an addi insn) and modify the tail for little-endian. I noticed some of the big-endian tail code was a little untidy so have cleaned that up too. * sysdeps/powerpc/powerpc64/strcmp.S (rTMP2): Define as r0. (rTMP): Define as r11. (strcmp): Add little-endian support. Optimise tail. * sysdeps/powerpc/powerpc32/strcmp.S: Similarly. * sysdeps/powerpc/powerpc64/strncmp.S: Likewise. * sysdeps/powerpc/powerpc32/strncmp.S: Likewise. * sysdeps/powerpc/powerpc64/power4/strncmp.S: Likewise. * sysdeps/powerpc/powerpc32/power4/strncmp.S: Likewise. * sysdeps/powerpc/powerpc64/power7/strncmp.S: Likewise. * sysdeps/powerpc/powerpc32/power7/strncmp.S: Likewise.
Diffstat (limited to 'sysdeps/powerpc/powerpc32/strcmp.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/strcmp.S | 42 |
1 files changed, 39 insertions, 3 deletions
diff --git a/sysdeps/powerpc/powerpc32/strcmp.S b/sysdeps/powerpc/powerpc32/strcmp.S index 297ca3c1b2..91d60c9053 100644 --- a/sysdeps/powerpc/powerpc32/strcmp.S +++ b/sysdeps/powerpc/powerpc32/strcmp.S @@ -24,7 +24,7 @@ EALIGN (strcmp, 4, 0) -#define rTMP r0 +#define rTMP2 r0 #define rRTN r3 #define rSTR1 r3 /* first string arg */ #define rSTR2 r4 /* second string arg */ @@ -34,6 +34,7 @@ EALIGN (strcmp, 4, 0) #define r7F7F r8 /* constant 0x7f7f7f7f */ #define rNEG r9 /* ~(word in s1 | 0x7f7f7f7f) */ #define rBITDIF r10 /* bits that differ in s1 & s2 words */ +#define rTMP r11 or rTMP, rSTR2, rSTR1 @@ -56,10 +57,45 @@ L(g1): add rTMP, rFEFE, rWORD1 and. rTMP, rTMP, rNEG cmpw cr1, rWORD1, rWORD2 beq+ L(g0) -L(endstring): + /* OK. We've hit the end of the string. We need to be careful that we don't compare two strings as different because of gunk beyond the end of the strings... */ +#ifdef __LITTLE_ENDIAN__ +L(endstring): + addi rTMP2, rTMP, -1 + andc rTMP2, rTMP2, rTMP + rlwimi rTMP2, rTMP2, 1, 0, 30 + and rWORD2, rWORD2, rTMP2 /* Mask off gunk. */ + and rWORD1, rWORD1, rTMP2 + rlwinm rTMP2, rWORD2, 8, 0xffffffff /* Byte reverse word. */ + rlwinm rTMP, rWORD1, 8, 0xffffffff + rlwimi rTMP2, rWORD2, 24, 0, 7 + rlwimi rTMP, rWORD1, 24, 0, 7 + rlwimi rTMP2, rWORD2, 24, 16, 23 + rlwimi rTMP, rWORD1, 24, 16, 23 + xor. rBITDIF, rTMP, rTMP2 + sub rRTN, rTMP, rTMP2 + bgelr+ + ori rRTN, rTMP2, 1 + blr + +L(different): + lwz rWORD1, -4(rSTR1) + rlwinm rTMP2, rWORD2, 8, 0xffffffff /* Byte reverse word. */ + rlwinm rTMP, rWORD1, 8, 0xffffffff + rlwimi rTMP2, rWORD2, 24, 0, 7 + rlwimi rTMP, rWORD1, 24, 0, 7 + rlwimi rTMP2, rWORD2, 24, 16, 23 + rlwimi rTMP, rWORD1, 24, 16, 23 + xor. rBITDIF, rTMP, rTMP2 + sub rRTN, rTMP, rTMP2 + bgelr+ + ori rRTN, rTMP2, 1 + blr + +#else +L(endstring): and rTMP, r7F7F, rWORD1 beq cr1, L(equal) add rTMP, rTMP, r7F7F @@ -84,7 +120,7 @@ L(different): L(highbit): ori rRTN, rWORD2, 1 blr - +#endif /* Oh well. In this case, we just do a byte-by-byte comparison. */ .align 4 |