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| author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2013-09-26 09:29:19 -0500 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2013-10-25 13:28:24 -0500 |
| commit | 69f13dbf06c6195de0ada8632271d58ca3cf55da (patch) | |
| tree | c2611636127f33fdc43bb51a6ac0f2f97795136c /sysdeps/powerpc/powerpc64/stpcpy.S | |
| parent | 151659f6371ce39a488fd132a5c8ce5e3bba983c (diff) | |
| download | glibc-69f13dbf06c6195de0ada8632271d58ca3cf55da.tar.gz glibc-69f13dbf06c6195de0ada8632271d58ca3cf55da.tar.xz glibc-69f13dbf06c6195de0ada8632271d58ca3cf55da.zip | |
PowerPC: strcpy/stpcpy optimization for PPC64/POWER7
This patch intends to unify both strcpy and stpcpy implementationsi for PPC64 and PPC64/POWER7. The idead default powerpc64 implementation is to provide both doubleword and word aligned memory access. For PPC64/POWER7 is also provide doubleword and word memory access, remove the branch hints, use the cmpb instruction for compare doubleword/words, and add an optimization for inputs of same alignment.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/stpcpy.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/stpcpy.S | 99 |
1 files changed, 2 insertions, 97 deletions
diff --git a/sysdeps/powerpc/powerpc64/stpcpy.S b/sysdeps/powerpc/powerpc64/stpcpy.S index c0b39729e2..09aa3be6b5 100644 --- a/sysdeps/powerpc/powerpc64/stpcpy.S +++ b/sysdeps/powerpc/powerpc64/stpcpy.S @@ -16,103 +16,8 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -#include <sysdep.h> - -/* See strlen.s for comments on how the end-of-string testing works. */ - -/* char * [r3] stpcpy (char *dest [r3], const char *src [r4]) */ - -EALIGN (__stpcpy, 4, 0) - CALL_MCOUNT 2 - -#define rTMP r0 -#define rRTN r3 -#define rDEST r3 /* pointer to previous word in dest */ -#define rSRC r4 /* pointer to previous word in src */ -#define rWORD r6 /* current word from src */ -#define rFEFE r7 /* 0xfefefeff */ -#define r7F7F r8 /* 0x7f7f7f7f */ -#define rNEG r9 /* ~(word in src | 0x7f7f7f7f) */ -#define rALT r10 /* alternate word from src */ - - or rTMP, rSRC, rDEST - clrldi. rTMP, rTMP, 62 - addi rDEST, rDEST, -4 - bne L(unaligned) - - lis rFEFE, -0x101 - lis r7F7F, 0x7f7f - lwz rWORD, 0(rSRC) - addi rFEFE, rFEFE, -0x101 - addi r7F7F, r7F7F, 0x7f7f - b L(g2) - -L(g0): lwzu rALT, 4(rSRC) - stwu rWORD, 4(rDEST) - add rTMP, rFEFE, rALT - nor rNEG, r7F7F, rALT - and. rTMP, rTMP, rNEG - bne- L(g1) - lwzu rWORD, 4(rSRC) - stwu rALT, 4(rDEST) -L(g2): add rTMP, rFEFE, rWORD - nor rNEG, r7F7F, rWORD - and. rTMP, rTMP, rNEG - beq+ L(g0) - - mr rALT, rWORD -/* We've hit the end of the string. Do the rest byte-by-byte. */ -L(g1): -#ifdef __LITTLE_ENDIAN__ - rlwinm. rTMP, rALT, 0, 24, 31 - stbu rALT, 4(rDEST) - beqlr- - rlwinm. rTMP, rALT, 24, 24, 31 - stbu rTMP, 1(rDEST) - beqlr- - rlwinm. rTMP, rALT, 16, 24, 31 - stbu rTMP, 1(rDEST) - beqlr- - rlwinm rTMP, rALT, 8, 24, 31 - stbu rTMP, 1(rDEST) - blr -#else - rlwinm. rTMP, rALT, 8, 24, 31 - stbu rTMP, 4(rDEST) - beqlr- - rlwinm. rTMP, rALT, 16, 24, 31 - stbu rTMP, 1(rDEST) - beqlr- - rlwinm. rTMP, rALT, 24, 24, 31 - stbu rTMP, 1(rDEST) - beqlr- - stbu rALT, 1(rDEST) - blr -#endif - -/* Oh well. In this case, we just do a byte-by-byte copy. */ - .align 4 - nop -L(unaligned): - lbz rWORD, 0(rSRC) - addi rDEST, rDEST, 3 - cmpwi rWORD, 0 - beq- L(u2) - -L(u0): lbzu rALT, 1(rSRC) - stbu rWORD, 1(rDEST) - cmpwi rALT, 0 - beq- L(u1) - nop /* Let 601 load start of loop. */ - lbzu rWORD, 1(rSRC) - stbu rALT, 1(rDEST) - cmpwi rWORD, 0 - bne+ L(u0) -L(u2): stbu rWORD, 1(rDEST) - blr -L(u1): stbu rALT, 1(rDEST) - blr -END (__stpcpy) +#define USE_AS_STPCPY +#include <sysdeps/powerpc/powerpc64/strcpy.S> weak_alias (__stpcpy, stpcpy) libc_hidden_def (__stpcpy) |