diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc32/power7')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power7/strncmp.S | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/sysdeps/powerpc/powerpc32/power7/strncmp.S b/sysdeps/powerpc/powerpc32/power7/strncmp.S deleted file mode 100644 index bbaab6c..0000000 --- a/sysdeps/powerpc/powerpc32/power7/strncmp.S +++ /dev/null @@ -1,199 +0,0 @@ -/* Optimized strcmp implementation for POWER7/PowerPC32. - Copyright (C) 2010-2023 Free Software Foundation, Inc. - 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 - <https://www.gnu.org/licenses/>. */ - -#include <sysdep.h> - -/* See strlen.s for comments on how the end-of-string testing works. */ - -/* int [r3] strncmp (const char *s1 [r3], - const char *s2 [r4], - size_t size [r5]) */ - -EALIGN (strncmp,5,0) - -#define rTMP2 r0 -#define rRTN r3 -#define rSTR1 r3 /* first string arg */ -#define rSTR2 r4 /* second string arg */ -#define rN r5 /* max string length */ -#define rWORD1 r6 /* current word in s1 */ -#define rWORD2 r7 /* current word in s2 */ -#define rWORD3 r10 -#define rWORD4 r11 -#define rFEFE r8 /* constant 0xfefefeff (-0x01010101) */ -#define r7F7F r9 /* constant 0x7f7f7f7f */ -#define rNEG r10 /* ~(word in s1 | 0x7f7f7f7f) */ -#define rBITDIF r11 /* bits that differ in s1 & s2 words */ -#define rTMP r12 - - dcbt 0,rSTR1 - nop - or rTMP,rSTR2,rSTR1 - lis r7F7F,0x7f7f - dcbt 0,rSTR2 - nop - clrlwi. rTMP,rTMP,30 - cmplwi cr1,rN,0 - lis rFEFE,-0x101 - bne L(unaligned) -/* We are word aligned so set up for two loops. first a word - loop, then fall into the byte loop if any residual. */ - srwi. rTMP,rN,2 - clrlwi rN,rN,30 - addi rFEFE,rFEFE,-0x101 - addi r7F7F,r7F7F,0x7f7f - cmplwi cr1,rN,0 - beq L(unaligned) - - mtctr rTMP - lwz rWORD1,0(rSTR1) - lwz rWORD2,0(rSTR2) - b L(g1) - -L(g0): - lwzu rWORD1,4(rSTR1) - bne cr1,L(different) - lwzu rWORD2,4(rSTR2) -L(g1): add rTMP,rFEFE,rWORD1 - nor rNEG,r7F7F,rWORD1 - bdz L(tail) - and. rTMP,rTMP,rNEG - cmpw cr1,rWORD1,rWORD2 - beq L(g0) - -/* OK. We've hit the end of the string. We need to be careful that - we don't compare two strings as different because of gunk beyond - the end of the strings... */ -#ifdef __LITTLE_ENDIAN__ -L(endstring): - slwi rTMP, rTMP, 1 - addi rTMP2, rTMP, -1 - andc rTMP2, rTMP2, rTMP - and rWORD2, rWORD2, rTMP2 /* Mask off gunk. */ - and rWORD1, rWORD1, rTMP2 - rlwinm rTMP2, rWORD2, 8, 0xffffffff /* Byte reverse word. */ - rlwinm rTMP, rWORD1, 8, 0xffffffff - rldimi rTMP2, rWORD2, 24, 32 - rldimi rTMP, rWORD1, 24, 32 - rlwimi rTMP2, rWORD2, 24, 16, 23 - rlwimi rTMP, rWORD1, 24, 16, 23 - xor. rBITDIF, rTMP, rTMP2 - sub rRTN, rTMP, rTMP2 - bgelr - ori rRTN, rTMP2, 1 - blr - -L(different): - lwz rWORD1, -4(rSTR1) - rlwinm rTMP2, rWORD2, 8, 0xffffffff /* Byte reverse word. */ - rlwinm rTMP, rWORD1, 8, 0xffffffff - rldimi rTMP2, rWORD2, 24, 32 - rldimi rTMP, rWORD1, 24, 32 - rlwimi rTMP2, rWORD2, 24, 16, 23 - rlwimi rTMP, rWORD1, 24, 16, 23 - xor. rBITDIF, rTMP, rTMP2 - sub rRTN, rTMP, rTMP2 - bgelr - ori rRTN, rTMP2, 1 - blr - -#else -L(endstring): - and rTMP,r7F7F,rWORD1 - beq cr1,L(equal) - add rTMP,rTMP,r7F7F - xor. rBITDIF,rWORD1,rWORD2 - andc rNEG,rNEG,rTMP - blt L(highbit) - cntlzw rBITDIF,rBITDIF - cntlzw rNEG,rNEG - addi rNEG,rNEG,7 - cmpw cr1,rNEG,rBITDIF - sub rRTN,rWORD1,rWORD2 - bgelr cr1 -L(equal): - li rRTN,0 - blr - -L(different): - lwz rWORD1,-4(rSTR1) - xor. rBITDIF,rWORD1,rWORD2 - sub rRTN,rWORD1,rWORD2 - bgelr -L(highbit): - ori rRTN, rWORD2, 1 - blr -#endif - -/* Oh well. In this case, we just do a byte-by-byte comparison. */ - .align 4 -L(tail): - and. rTMP,rTMP,rNEG - cmpw cr1,rWORD1,rWORD2 - bne L(endstring) - addi rSTR1,rSTR1,4 - bne cr1,L(different) - addi rSTR2,rSTR2,4 - cmplwi cr1,rN,0 -L(unaligned): - mtctr rN - ble cr1,L(ux) -L(uz): - lbz rWORD1,0(rSTR1) - lbz rWORD2,0(rSTR2) - .align 4 -L(u1): - cmpwi cr1,rWORD1,0 - bdz L(u4) - cmpw rWORD1,rWORD2 - beq cr1,L(u4) - bne L(u4) - lbzu rWORD3,1(rSTR1) - lbzu rWORD4,1(rSTR2) - cmpwi cr1,rWORD3,0 - bdz L(u3) - cmpw rWORD3,rWORD4 - beq cr1,L(u3) - bne L(u3) - lbzu rWORD1,1(rSTR1) - lbzu rWORD2,1(rSTR2) - cmpwi cr1,rWORD1,0 - bdz L(u4) - cmpw rWORD1,rWORD2 - beq cr1,L(u4) - bne L(u4) - lbzu rWORD3,1(rSTR1) - lbzu rWORD4,1(rSTR2) - cmpwi cr1,rWORD3,0 - bdz L(u3) - cmpw rWORD3,rWORD4 - beq cr1,L(u3) - bne L(u3) - lbzu rWORD1,1(rSTR1) - lbzu rWORD2,1(rSTR2) - b L(u1) - -L(u3): sub rRTN,rWORD3,rWORD4 - blr -L(u4): sub rRTN,rWORD1,rWORD2 - blr -L(ux): - li rRTN,0 - blr -END (strncmp) -libc_hidden_builtin_def (strncmp) |