diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc32/power7/memcpy.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power7/memcpy.S | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc32/power7/memcpy.S b/sysdeps/powerpc/powerpc32/power7/memcpy.S new file mode 100644 index 0000000000..d96ef20851 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/power7/memcpy.S @@ -0,0 +1,469 @@ +/* Optimized memcpy implementation for PowerPC32/POWER7. + Copyright (C) 2010 Free Software Foundation, Inc. + Contributed by Luis Machado <luisgpm@br.ibm.com>. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA + 02110-1301 USA. */ + +#include <sysdep.h> +#include <bp-sym.h> +#include <bp-asm.h> + +/* __ptr_t [r3] memcpy (__ptr_t dst [r3], __ptr_t src [r4], size_t len [r5]); + Returns 'dst'. */ + + .machine power7 +EALIGN (BP_SYM (memcpy), 5, 0) + CALL_MCOUNT + + stwu 1,-32(1) + cfi_adjust_cfa_offset(32) + stw 30,20(1) + cfi_offset(30,(20-32)) + stw 31,24(1) + mr 30,3 + cmplwi cr1,5,31 + neg 0,3 + cfi_offset(31,-8) + ble cr1, L(copy_LT_32) /* If move < 32 bytes use short move + code. */ + + andi. 11,3,7 /* Check alignment of DST. */ + clrlwi 10,4,29 /* Check alignment of SRC. */ + cmplw cr6,10,11 /* SRC and DST alignments match? */ + mr 12,4 + mr 31,5 + bne cr6,L(copy_GE_32_unaligned) + + srwi 9,5,3 /* Number of full quadwords remaining. */ + + beq L(copy_GE_32_aligned_cont) + + clrlwi 0,0,29 + mtcrf 0x01,0 + subf 31,0,5 + + /* Get the SRC aligned to 8 bytes. */ + +1: bf 31,2f + lbz 6,0(12) + addi 12,12,1 + stb 6,0(3) + addi 3,3,1 +2: bf 30,4f + lhz 6,0(12) + addi 12,12,2 + sth 6,0(3) + addi 3,3,2 +4: bf 29,0f + lwz 6,0(12) + addi 12,12,4 + stw 6,0(3) + addi 3,3,4 +0: + clrlwi 10,12,29 /* Check alignment of SRC again. */ + srwi 9,31,3 /* Number of full doublewords remaining. */ + +L(copy_GE_32_aligned_cont): + + clrlwi 11,31,29 + mtcrf 0x01,9 + + srwi 8,31,5 + cmplwi cr1,9,4 + cmplwi cr6,11,0 + mr 11,12 + + /* Copy 1~3 doublewords so the main loop starts + at a multiple of 32 bytes. */ + + bf 30,1f + lfd 6,0(12) + lfd 7,8(12) + addi 11,12,16 + mtctr 8 + stfd 6,0(3) + stfd 7,8(3) + addi 10,3,16 + bf 31,4f + lfd 0,16(12) + stfd 0,16(3) + blt cr1,3f + addi 11,12,24 + addi 10,3,24 + b 4f + + .align 4 +1: /* Copy 1 doubleword and set the counter. */ + mr 10,3 + mtctr 8 + bf 31,4f + lfd 6,0(12) + addi 11,12,8 + stfd 6,0(3) + addi 10,3,8 + + .align 4 +4: /* Main aligned copy loop. Copies 32-bytes at a time. */ + lfd 6,0(11) + lfd 7,8(11) + lfd 8,16(11) + lfd 0,24(11) + addi 11,11,32 + + stfd 6,0(10) + stfd 7,8(10) + stfd 8,16(10) + stfd 0,24(10) + addi 10,10,32 + bdnz 4b +3: + + /* Check for tail bytes. */ + + clrrwi 0,31,3 + mtcrf 0x01,31 + beq cr6,0f + +.L9: + add 3,3,0 + add 12,12,0 + + /* At this point we have a tail of 0-7 bytes and we know that the + destination is doubleword-aligned. */ +4: /* Copy 4 bytes. */ + bf 29,2f + + lwz 6,0(12) + addi 12,12,4 + stw 6,0(3) + addi 3,3,4 +2: /* Copy 2 bytes. */ + bf 30,1f + + lhz 6,0(12) + addi 12,12,2 + sth 6,0(3) + addi 3,3,2 +1: /* Copy 1 byte. */ + bf 31,0f + + lbz 6,0(12) + stb 6,0(3) +0: /* Return original DST pointer. */ + mr 3,30 + lwz 30,20(1) + lwz 31,24(1) + addi 1,1,32 + blr + + /* Handle copies of 0~31 bytes. */ + .align 4 +L(copy_LT_32): + cmplwi cr6,5,8 + mr 12,4 + mtcrf 0x01,5 + ble cr6,L(copy_LE_8) + + /* At least 9 bytes to go. */ + neg 8,4 + clrrwi 11,4,2 + andi. 0,8,3 + cmplwi cr1,5,16 + mr 10,5 + beq L(copy_LT_32_aligned) + + /* Force 4-bytes alignment for SRC. */ + mtocrf 0x01,0 + subf 10,0,5 +2: bf 30,1f + + lhz 6,0(12) + addi 12,12,2 + sth 6,0(3) + addi 3,3,2 +1: bf 31,L(end_4bytes_alignment) + + lbz 6,0(12) + addi 12,12,1 + stb 6,0(3) + addi 3,3,1 + + .align 4 +L(end_4bytes_alignment): + cmplwi cr1,10,16 + mtcrf 0x01,10 + +L(copy_LT_32_aligned): + /* At least 6 bytes to go, and SRC is word-aligned. */ + blt cr1,8f + + /* Copy 16 bytes. */ + lwz 6,0(12) + lwz 7,4(12) + stw 6,0(3) + lwz 8,8(12) + stw 7,4(3) + lwz 6,12(12) + addi 12,12,16 + stw 8,8(3) + stw 6,12(3) + addi 3,3,16 +8: /* Copy 8 bytes. */ + bf 28,4f + + lwz 6,0(12) + lwz 7,4(12) + addi 12,12,8 + stw 6,0(3) + stw 7,4(3) + addi 3,3,8 +4: /* Copy 4 bytes. */ + bf 29,2f + + lwz 6,0(12) + addi 12,12,4 + stw 6,0(3) + addi 3,3,4 +2: /* Copy 2-3 bytes. */ + bf 30,1f + + lhz 6,0(12) + sth 6,0(3) + bf 31,0f + lbz 7,2(12) + stb 7,2(3) + + /* Return original DST pointer. */ + mr 3,30 + lwz 30,20(1) + addi 1,1,32 + blr + + .align 4 +1: /* Copy 1 byte. */ + bf 31,0f + + lbz 6,0(12) + stb 6,0(3) +0: /* Return original DST pointer. */ + mr 3,30 + lwz 30,20(1) + addi 1,1,32 + blr + + /* Handles copies of 0~8 bytes. */ + .align 4 +L(copy_LE_8): + bne cr6,4f + + /* Though we could've used lfd/stfd here, they are still + slow for unaligned cases. */ + + lwz 6,0(4) + lwz 7,4(4) + stw 6,0(3) + stw 7,4(3) + + /* Return original DST pointer. */ + mr 3,30 + lwz 30,20(1) + addi 1,1,32 + blr + + .align 4 +4: /* Copies 4~7 bytes. */ + bf 29,2b + + lwz 6,0(4) + stw 6,0(3) + bf 30,5f + lhz 7,4(4) + sth 7,4(3) + bf 31,0f + lbz 8,6(4) + stb 8,6(3) + + /* Return original DST pointer. */ + mr 3,30 + lwz 30,20(1) + addi 1,1,32 + blr + + .align 4 +5: /* Copy 1 byte. */ + bf 31,0f + + lbz 6,4(4) + stb 6,4(3) + +0: /* Return original DST pointer. */ + mr 3,30 + lwz 30,20(1) + addi 1,1,32 + blr + + /* Handle copies of 32+ bytes where DST is aligned (to quadword) but + SRC is not. Use aligned quadword loads from SRC, shifted to realign + the data, allowing for aligned DST stores. */ + .align 4 +L(copy_GE_32_unaligned): + andi. 11,3,15 /* Check alignment of DST. */ + clrlwi 0,0,28 /* Number of bytes until the 1st + quadword of DST. */ + srwi 9,5,4 /* Number of full quadwords remaining. */ + + beq L(copy_GE_32_unaligned_cont) + + /* SRC is not quadword aligned, get it aligned. */ + + mtcrf 0x01,0 + subf 31,0,5 + + /* Vector instructions work best when proper alignment (16-bytes) + is present. Move 0~15 bytes as needed to get DST quadword-aligned. */ +1: /* Copy 1 byte. */ + bf 31,2f + + lbz 6,0(12) + addi 12,12,1 + stb 6,0(3) + addi 3,3,1 +2: /* Copy 2 bytes. */ + bf 30,4f + + lhz 6,0(12) + addi 12,12,2 + sth 6,0(3) + addi 3,3,2 +4: /* Copy 4 bytes. */ + bf 29,8f + + lwz 6,0(12) + addi 12,12,4 + stw 6,0(3) + addi 3,3,4 +8: /* Copy 8 bytes. */ + bf 28,0f + + lfd 6,0(12) + addi 12,12,8 + stfd 6,0(3) + addi 3,3,8 +0: + clrlwi 10,12,28 /* Check alignment of SRC. */ + srdi 9,31,4 /* Number of full quadwords remaining. */ + + /* The proper alignment is present, it is OK to copy the bytes now. */ +L(copy_GE_32_unaligned_cont): + + /* Setup two indexes to speed up the indexed vector operations. */ + clrlwi 11,31,28 + li 6,16 /* Index for 16-bytes offsets. */ + li 7,32 /* Index for 32-bytes offsets. */ + cmplwi cr1,11,0 + srdi 8,31,5 /* Setup the loop counter. */ + mr 10,3 + mr 11,12 + mtcrf 0x01,9 + cmplwi cr6,9,1 + lvsl 5,0,12 + lvx 3,0,12 + bf 31,L(setup_unaligned_loop) + + /* Copy another 16 bytes to align to 32-bytes due to the loop . */ + lvx 4,12,6 + vperm 6,3,4,5 + addi 11,12,16 + addi 10,3,16 + stvx 6,0,3 + vor 3,4,4 + +L(setup_unaligned_loop): + mtctr 8 + ble cr6,L(end_unaligned_loop) + + /* Copy 32 bytes at a time using vector instructions. */ + .align 4 +L(unaligned_loop): + + /* Note: vr6/vr10 may contain data that was already copied, + but in order to get proper alignment, we may have to copy + some portions again. This is faster than having unaligned + vector instructions though. */ + + lvx 4,11,6 /* vr4 = r11+16. */ + vperm 6,3,4,5 /* Merge the correctly-aligned portions + of vr3/vr4 into vr6. */ + lvx 3,11,7 /* vr3 = r11+32. */ + vperm 10,4,3,5 /* Merge the correctly-aligned portions + of vr3/vr4 into vr10. */ + addi 11,11,32 + stvx 6,0,10 + stvx 10,10,6 + addi 10,10,32 + + bdnz L(unaligned_loop) + + .align 4 +L(end_unaligned_loop): + + /* Check for tail bytes. */ + clrrwi 0,31,4 + mtcrf 0x01,31 + beq cr1,0f + + add 3,3,0 + add 12,12,0 + + /* We have 1~15 tail bytes to copy, and DST is quadword aligned. */ +8: /* Copy 8 bytes. */ + bf 28,4f + + lwz 6,0(12) + lwz 7,4(12) + addi 12,12,8 + stw 6,0(3) + stw 7,4(3) + addi 3,3,8 +4: /* Copy 4 bytes. */ + bf 29,2f + + lwz 6,0(12) + addi 12,12,4 + stw 6,0(3) + addi 3,3,4 +2: /* Copy 2~3 bytes. */ + bf 30,1f + + lhz 6,0(12) + addi 12,12,2 + sth 6,0(3) + addi 3,3,2 +1: /* Copy 1 byte. */ + bf 31,0f + + lbz 6,0(12) + stb 6,0(3) +0: /* Return original DST pointer. */ + mr 3,30 + lwz 30,20(1) + lwz 31,24(1) + addi 1,1,32 + blr + +END (BP_SYM (memcpy)) +libc_hidden_builtin_def (memcpy) |