diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/power7/strncmp.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/power7/strncmp.S | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/sysdeps/powerpc/powerpc64/power7/strncmp.S b/sysdeps/powerpc/powerpc64/power7/strncmp.S deleted file mode 100644 index d53b31be8e..0000000000 --- a/sysdeps/powerpc/powerpc64/power7/strncmp.S +++ /dev/null @@ -1,227 +0,0 @@ -/* Optimized strcmp implementation for POWER7/PowerPC64. - Copyright (C) 2010-2017 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 - <http://www.gnu.org/licenses/>. */ - -#include <sysdep.h> - -#ifndef STRNCMP -# define STRNCMP strncmp -#endif - -/* 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) - CALL_MCOUNT 3 - -#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 0xfefefefefefefeff (-0x0101010101010101) */ -#define r7F7F r9 /* constant 0x7f7f7f7f7f7f7f7f */ -#define rNEG r10 /* ~(word in s1 | 0x7f7f7f7f7f7f7f7f) */ -#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 - clrldi. rTMP,rTMP,61 - cmpldi cr1,rN,0 - lis rFEFE,-0x101 - bne L(unaligned) -/* We are doubleword aligned so set up for two loops. first a double word - loop, then fall into the byte loop if any residual. */ - srdi. rTMP,rN,3 - clrldi rN,rN,61 - addi rFEFE,rFEFE,-0x101 - addi r7F7F,r7F7F,0x7f7f - cmpldi cr1,rN,0 - beq L(unaligned) - - mtctr rTMP - ld rWORD1,0(rSTR1) - ld rWORD2,0(rSTR2) - sldi rTMP,rFEFE,32 - insrdi r7F7F,r7F7F,32,0 - add rFEFE,rFEFE,rTMP - b L(g1) - -L(g0): - ldu rWORD1,8(rSTR1) - bne cr1,L(different) - ldu rWORD2,8(rSTR2) -L(g1): add rTMP,rFEFE,rWORD1 - nor rNEG,r7F7F,rWORD1 - bdz L(tail) - and. rTMP,rTMP,rNEG - cmpd 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): - addi rTMP2, rTMP, -1 - beq cr1, L(equal) - andc rTMP2, rTMP2, rTMP - rldimi rTMP2, rTMP2, 1, 0 - and rWORD2, rWORD2, rTMP2 /* Mask off gunk. */ - and rWORD1, rWORD1, rTMP2 - cmpd cr1, rWORD1, rWORD2 - beq cr1, L(equal) - cmpb rBITDIF, rWORD1, rWORD2 /* 0xff on equal bytes. */ - addi rNEG, rBITDIF, 1 - orc rNEG, rNEG, rBITDIF /* 0's below LS differing byte. */ - sldi rNEG, rNEG, 8 /* 1's above LS differing byte. */ - andc rWORD1, rWORD1, rNEG /* mask off MS bytes. */ - andc rWORD2, rWORD2, rNEG - xor. rBITDIF, rWORD1, rWORD2 - sub rRTN, rWORD1, rWORD2 - blt L(highbit) - sradi rRTN, rRTN, 63 /* must return an int. */ - ori rRTN, rRTN, 1 - blr -L(equal): - li rRTN, 0 - blr - -L(different): - ld rWORD1, -8(rSTR1) - cmpb rBITDIF, rWORD1, rWORD2 /* 0xff on equal bytes. */ - addi rNEG, rBITDIF, 1 - orc rNEG, rNEG, rBITDIF /* 0's below LS differing byte. */ - sldi rNEG, rNEG, 8 /* 1's above LS differing byte. */ - andc rWORD1, rWORD1, rNEG /* mask off MS bytes. */ - andc rWORD2, rWORD2, rNEG - xor. rBITDIF, rWORD1, rWORD2 - sub rRTN, rWORD1, rWORD2 - blt L(highbit) - sradi rRTN, rRTN, 63 - ori rRTN, rRTN, 1 - blr -L(highbit): - sradi rRTN, rWORD2, 63 - ori rRTN, rRTN, 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) - cntlzd rBITDIF,rBITDIF - cntlzd rNEG,rNEG - addi rNEG,rNEG,7 - cmpd cr1,rNEG,rBITDIF - sub rRTN,rWORD1,rWORD2 - blt cr1,L(equal) - sradi rRTN,rRTN,63 /* must return an int. */ - ori rRTN,rRTN,1 - blr -L(equal): - li rRTN,0 - blr - -L(different): - ld rWORD1,-8(rSTR1) - xor. rBITDIF,rWORD1,rWORD2 - sub rRTN,rWORD1,rWORD2 - blt L(highbit) - sradi rRTN,rRTN,63 - ori rRTN,rRTN,1 - blr -L(highbit): - sradi rRTN,rWORD2,63 - ori rRTN,rRTN,1 - blr -#endif - -/* Oh well. In this case, we just do a byte-by-byte comparison. */ - .align 4 -L(tail): - and. rTMP,rTMP,rNEG - cmpd cr1,rWORD1,rWORD2 - bne L(endstring) - addi rSTR1,rSTR1,8 - bne cr1,L(different) - addi rSTR2,rSTR2,8 - cmpldi 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): - cmpdi cr1,rWORD1,0 - bdz L(u4) - cmpd rWORD1,rWORD2 - beq cr1,L(u4) - bne L(u4) - lbzu rWORD3,1(rSTR1) - lbzu rWORD4,1(rSTR2) - cmpdi cr1,rWORD3,0 - bdz L(u3) - cmpd rWORD3,rWORD4 - beq cr1,L(u3) - bne L(u3) - lbzu rWORD1,1(rSTR1) - lbzu rWORD2,1(rSTR2) - cmpdi cr1,rWORD1,0 - bdz L(u4) - cmpd rWORD1,rWORD2 - beq cr1,L(u4) - bne L(u4) - lbzu rWORD3,1(rSTR1) - lbzu rWORD4,1(rSTR2) - cmpdi cr1,rWORD3,0 - bdz L(u3) - cmpd 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) |