diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/power7/rawmemchr.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/power7/rawmemchr.S | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/sysdeps/powerpc/powerpc64/power7/rawmemchr.S b/sysdeps/powerpc/powerpc64/power7/rawmemchr.S index 96b54047a9..56a19bd885 100644 --- a/sysdeps/powerpc/powerpc64/power7/rawmemchr.S +++ b/sysdeps/powerpc/powerpc64/power7/rawmemchr.S @@ -1,5 +1,5 @@ /* Optimized rawmemchr implementation for PowerPC64/POWER7 using cmpb insn. - Copyright (C) 2010 Free Software Foundation, Inc. + Copyright (C) 2010-2014 Free Software Foundation, Inc. Contributed by Luis Machado <luisgpm@br.ibm.com>. This file is part of the GNU C Library. @@ -18,19 +18,17 @@ <http://www.gnu.org/licenses/>. */ #include <sysdep.h> -#include <bp-sym.h> -#include <bp-asm.h> /* int [r3] rawmemchr (void *s [r3], int c [r4]) */ .machine power7 -ENTRY (BP_SYM(__rawmemchr)) +ENTRY (__rawmemchr) CALL_MCOUNT 2 dcbt 0,r3 clrrdi r8,r3,3 /* Align the address to doubleword boundary. */ /* Replicate byte to doubleword. */ - rlwimi r4,r4,8,16,23 - rlwimi r4,r4,16,0,15 + insrdi r4,r4,8,48 + insrdi r4,r4,16,32 insrdi r4,r4,32,0 /* Now r4 has a doubleword of c bytes. */ @@ -38,8 +36,13 @@ ENTRY (BP_SYM(__rawmemchr)) rlwinm r6,r3,3,26,28 /* Calculate padding. */ ld r12,0(r8) /* Load doubleword from memory. */ cmpb r5,r12,r4 /* Compare each byte against c byte. */ +#ifdef __LITTLE_ENDIAN__ + srd r5,r5,r6 + sld r5,r5,r6 +#else sld r5,r5,r6 /* Move left to discard ignored bits. */ srd r5,r5,r6 /* Bring the bits back as zeros. */ +#endif cmpdi cr7,r5,0 /* If r5 == 0, no c bytes have been found. */ bne cr7,L(done) @@ -93,10 +96,16 @@ L(loop): doubleword from the string. Use that fact to find out what is the position of the byte inside the string. */ L(done): +#ifdef __LITTLE_ENDIAN__ + addi r0,r5,-1 + andc r0,r0,r5 + popcntd r0,r0 /* Count trailing zeros. */ +#else cntlzd r0,r5 /* Count leading zeros before the match. */ - srdi r0,r0,3 /* Convert leading zeroes to bytes. */ +#endif + srdi r0,r0,3 /* Convert leading zeros to bytes. */ add r3,r8,r0 /* Return address of the matching char. */ blr -END (BP_SYM (__rawmemchr)) +END (__rawmemchr) weak_alias (__rawmemchr,rawmemchr) libc_hidden_builtin_def (__rawmemchr) |