| /* Optimized mempcpy implementation for POWER7. |
| Copyright (C) 2010-2018 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| |
| /* void * [r3] __mempcpy (void *dst [r3], void *src [r4], size_t len [r5]); |
| Returns 'dst' + 'len'. */ |
| |
| .machine power7 |
| EALIGN (__mempcpy, 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 DST + LEN pointer. */ |
| add 3,30,5 |
| 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 DST + LEN pointer. */ |
| add 3,30,5 |
| 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 DST + LEN pointer. */ |
| add 3,30,5 |
| 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 DST + LEN pointer. */ |
| add 3,30,5 |
| 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 DST + LEN pointer. */ |
| add 3,30,5 |
| 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 DST + LEN pointer. */ |
| add 3,30,5 |
| 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) |
| |
| /* DST 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. */ |
| srwi 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 |
| srwi 8,31,5 /* Setup the loop counter. */ |
| mr 10,3 |
| mr 11,12 |
| mtcrf 0x01,9 |
| cmplwi cr6,9,1 |
| #ifdef __LITTLE_ENDIAN__ |
| lvsr 5,0,12 |
| #else |
| lvsl 5,0,12 |
| #endif |
| 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 |
| #ifdef __LITTLE_ENDIAN__ |
| vperm 6,4,3,5 |
| #else |
| vperm 6,3,4,5 |
| #endif |
| 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. */ |
| #ifdef __LITTLE_ENDIAN__ |
| vperm 6,4,3,5 |
| #else |
| vperm 6,3,4,5 |
| #endif |
| lvx 3,11,7 /* vr3 = r11+32. */ |
| #ifdef __LITTLE_ENDIAN__ |
| vperm 10,3,4,5 |
| #else |
| vperm 10,4,3,5 |
| #endif |
| 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 DST + LEN pointer. */ |
| add 3,30,5 |
| lwz 30,20(1) |
| lwz 31,24(1) |
| addi 1,1,32 |
| blr |
| |
| END (__mempcpy) |
| libc_hidden_def (__mempcpy) |
| weak_alias (__mempcpy, mempcpy) |
| libc_hidden_builtin_def (mempcpy) |
