diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/power7/memcpy.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/power7/memcpy.S | 22 |
1 files changed, 4 insertions, 18 deletions
diff --git a/sysdeps/powerpc/powerpc64/power7/memcpy.S b/sysdeps/powerpc/powerpc64/power7/memcpy.S index bbfd381b1b..58d9b1276d 100644 --- a/sysdeps/powerpc/powerpc64/power7/memcpy.S +++ b/sysdeps/powerpc/powerpc64/power7/memcpy.S @@ -36,16 +36,11 @@ EALIGN (memcpy, 5, 0) ble cr1, L(copy_LT_32) /* If move < 32 bytes use short move code. */ -#ifdef __LITTLE_ENDIAN__ -/* In little-endian mode, power7 takes an alignment trap on any lxvd2x - or stxvd2x crossing a 32-byte boundary, so ensure the aligned_copy - loop is only used for quadword aligned copies. */ +/* Align copies using VSX instructions to quadword. It is to avoid alignment + traps when memcpy is used on non-cacheable memory (for instance, memory + mapped I/O). */ andi. 10,3,15 clrldi 11,4,60 -#else - andi. 10,3,7 /* Check alignment of DST. */ - clrldi 11,4,61 /* Check alignment of SRC. */ -#endif cmpld cr6,10,11 /* SRC and DST alignments match? */ mr dst,3 @@ -53,13 +48,9 @@ EALIGN (memcpy, 5, 0) beq L(aligned_copy) mtocrf 0x01,0 -#ifdef __LITTLE_ENDIAN__ clrldi 0,0,60 -#else - clrldi 0,0,61 -#endif -/* Get the DST and SRC aligned to 8 bytes (16 for little-endian). */ +/* Get the DST and SRC aligned to 16 bytes. */ 1: bf 31,2f lbz 6,0(src) @@ -79,14 +70,12 @@ EALIGN (memcpy, 5, 0) stw 6,0(dst) addi dst,dst,4 8: -#ifdef __LITTLE_ENDIAN__ bf 28,16f ld 6,0(src) addi src,src,8 std 6,0(dst) addi dst,dst,8 16: -#endif subf cnt,0,cnt /* Main aligned copy loop. Copies 128 bytes at a time. */ @@ -298,9 +287,6 @@ L(copy_LE_8): .align 4 L(copy_GE_32_unaligned): clrldi 0,0,60 /* Number of bytes until the 1st dst quadword. */ -#ifndef __LITTLE_ENDIAN__ - andi. 10,3,15 /* Check alignment of DST (against quadwords). */ -#endif srdi 9,cnt,4 /* Number of full quadwords remaining. */ beq L(copy_GE_32_unaligned_cont) |