diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/power9/strncmp.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/power9/strncmp.S | 379 |
1 files changed, 0 insertions, 379 deletions
diff --git a/sysdeps/powerpc/powerpc64/power9/strncmp.S b/sysdeps/powerpc/powerpc64/power9/strncmp.S deleted file mode 100644 index c946a5c638..0000000000 --- a/sysdeps/powerpc/powerpc64/power9/strncmp.S +++ /dev/null @@ -1,379 +0,0 @@ -/* Optimized strncmp implementation for PowerPC64/POWER9. - Copyright (C) 2016-2017 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/>. */ -#ifdef __LITTLE_ENDIAN__ -#include <sysdep.h> - -/* Implements the function - - int [r3] strncmp (const char *s1 [r3], const char *s2 [r4], size_t [r5] n) - - The implementation uses unaligned doubleword access to avoid specialized - code paths depending of data alignment for first 32 bytes and uses - vectorised loops after that. */ - -#ifndef STRNCMP -# define STRNCMP strncmp -#endif - -/* TODO: Change this to actual instructions when minimum binutils is upgraded - to 2.27. Macros are defined below for these newer instructions in order - to maintain compatibility. */ -# define VCTZLSBB(r,v) .long (0x10010602 | ((r)<<(32-11)) | ((v)<<(32-21))) - -# define VEXTUBRX(t,a,b) .long (0x1000070d \ - | ((t)<<(32-11)) \ - | ((a)<<(32-16)) \ - | ((b)<<(32-21)) ) - -# define VCMPNEZB(t,a,b) .long (0x10000507 \ - | ((t)<<(32-11)) \ - | ((a)<<(32-16)) \ - | ((b)<<(32-21)) ) - -/* Get 16 bytes for unaligned case. - reg1: Vector to hold next 16 bytes. - reg2: Address to read from. - reg3: Permute control vector. */ -# define GET16BYTES(reg1, reg2, reg3) \ - lvx reg1, 0, reg2; \ - vperm v8, v2, reg1, reg3; \ - vcmpequb. v8, v0, v8; \ - beq cr6, 1f; \ - vspltisb v9, 0; \ - b 2f; \ - .align 4; \ -1: \ - cmplw cr6, r5, r11; \ - ble cr6, 2f; \ - addi r6, reg2, 16; \ - lvx v9, 0, r6; \ -2: \ - vperm reg1, v9, reg1, reg3; - -/* TODO: change this to .machine power9 when minimum binutils - is upgraded to 2.27. */ - .machine power7 -EALIGN (STRNCMP, 4, 0) - /* Check if size is 0. */ - cmpdi cr0, r5, 0 - beq cr0, L(ret0) - li r0, 0 - - /* Check if [s1]+32 or [s2]+32 will cross a 4K page boundary using - the code: - - (((size_t) s1) % PAGE_SIZE > (PAGE_SIZE - ITER_SIZE)) - - with PAGE_SIZE being 4096 and ITER_SIZE begin 32. */ - rldicl r8, r3, 0, 52 - cmpldi cr7, r8, 4096-32 - bgt cr7, L(pagecross) - rldicl r9, r4, 0, 52 - cmpldi cr7, r9, 4096-32 - bgt cr7, L(pagecross) - - /* For short strings up to 32 bytes, load both s1 and s2 using - unaligned dwords and compare. */ - - ld r7, 0(r3) - ld r9, 0(r4) - li r8, 0 - cmpb r8, r7, r8 - cmpb r6, r7, r9 - orc. r8, r8, r6 - bne cr0, L(different1) - - /* If the strings compared are equal, but size is less or equal - to 8, return 0. */ - cmpldi cr7, r5, 8 - li r9, 0 - ble cr7, L(ret1) - addi r5, r5, -8 - - ld r7, 8(r3) - ld r9, 8(r4) - cmpb r8, r7, r8 - cmpb r6, r7, r9 - orc. r8, r8, r6 - bne cr0, L(different1) - cmpldi cr7, r5, 8 - mr r9, r8 - ble cr7, L(ret1) - /* Update pointers and size. */ - addi r5, r5, -8 - addi r3, r3, 16 - addi r4, r4, 16 - - ld r7, 0(r3) - ld r9, 0(r4) - li r8, 0 - cmpb r8, r7, r8 - cmpb r6, r7, r9 - orc. r8, r8, r6 - bne cr0, L(different1) - cmpldi cr7, r5, 8 - li r9, 0 - ble cr7, L(ret1) - addi r5, r5, -8 - - ld r7, 8(r3) - ld r9, 8(r4) - cmpb r8, r7, r8 - cmpb r6, r7, r9 - orc. r8, r8, r6 - bne cr0, L(different1) - cmpldi cr7, r5, 8 - mr r9, r8 - ble cr7, L(ret1) - - /* Update pointers and size. */ - addi r5, r5, -8 - addi r3, r3, 16 - addi r4, r4, 16 -L(align): - /* Now it has checked for first 32 bytes, align source1 to doubleword - and adjust source2 address. */ - vspltisb v0, 0 - vspltisb v2, -1 - or r6, r4, r3 - andi. r6, r6, 0xF - beq cr0, L(aligned) - lvsr v6, 0, r4 /* Compute mask. */ - clrldi r6, r4, 60 - subfic r11, r6, 16 - andi. r6, r3, 0xF - beq cr0, L(s1_align) - /* Both s1 and s2 are unaligned. */ - GET16BYTES(v5, r4, v6) - lvsr v10, 0, r3 /* Compute mask. */ - clrldi r6, r3, 60 - subfic r11, r6, 16 - GET16BYTES(v4, r3, v10) - VCMPNEZB(v7, v5, v4) - beq cr6, L(match) - b L(different) - - /* Align s1 to qw and adjust s2 address. */ - .align 4 -L(match): - cmpldi cr7, r5, 16 - ble cr7, L(ret0) - subf r5, r11, r5 - add r3, r3, r11 - add r4, r4, r11 - andi. r11, r4, 0xF - beq cr0, L(aligned) - lvsr v6, 0, r4 - clrldi r6, r4, 60 - subfic r11, r6, 16 - /* There are 2 loops depending on the input alignment. - Each loop gets 16 bytes from s1 and s2, checks for null - and compares them. Loops until a mismatch or null occurs. */ -L(s1_align): - lvx v4, 0, r3 - GET16BYTES(v5, r4, v6) - VCMPNEZB(v7, v5, v4) - bne cr6, L(different) - cmpldi cr7, r5, 16 - ble cr7, L(ret0) - addi r5, r5, -16 - addi r3, r3, 16 - addi r4, r4, 16 - - lvx v4, 0, r3 - GET16BYTES(v5, r4, v6) - VCMPNEZB(v7, v5, v4) - bne cr6, L(different) - cmpldi cr7, r5, 16 - ble cr7, L(ret0) - addi r5, r5, -16 - addi r3, r3, 16 - addi r4, r4, 16 - - lvx v4, 0, r3 - GET16BYTES(v5, r4, v6) - VCMPNEZB(v7, v5, v4) - bne cr6, L(different) - cmpldi cr7, r5, 16 - ble cr7, L(ret0) - addi r5, r5, -16 - addi r3, r3, 16 - addi r4, r4, 16 - - lvx v4, 0, r3 - GET16BYTES(v5, r4, v6) - VCMPNEZB(v7, v5, v4) - bne cr6, L(different) - cmpldi cr7, r5, 16 - ble cr7, L(ret0) - addi r5, r5, -16 - addi r3, r3, 16 - addi r4, r4, 16 - b L(s1_align) - .align 4 -L(aligned): - lvx v4, 0, r3 - lvx v5, 0, r4 - VCMPNEZB(v7, v5, v4) - bne cr6, L(different) - cmpldi cr7, r5, 16 - ble cr7, L(ret0) - addi r5, r5, -16 - addi r3, r3, 16 - addi r4, r4, 16 - - lvx v4, 0, r3 - lvx v5, 0, r4 - VCMPNEZB(v7, v5, v4) - bne cr6, L(different) - cmpldi cr7, r5, 16 - ble cr7, L(ret0) - addi r5, r5, -16 - addi r3, r3, 16 - addi r4, r4, 16 - - lvx v4, 0, r3 - lvx v5, 0, r4 - VCMPNEZB(v7, v5, v4) - bne cr6, L(different) - cmpldi cr7, r5, 16 - ble cr7, L(ret0) - addi r5, r5, -16 - addi r3, r3, 16 - addi r4, r4, 16 - - lvx v4, 0, r3 - lvx v5, 0, r4 - VCMPNEZB(v7, v5, v4) - bne cr6, L(different) - cmpldi cr7, r5, 16 - ble cr7, L(ret0) - addi r5, r5, -16 - addi r3, r3, 16 - addi r4, r4, 16 - b L(aligned) - /* Calculate and return the difference. */ -L(different): - VCTZLSBB(r6, v7) - cmplw cr7, r5, r6 - ble cr7, L(ret0) - VEXTUBRX(r5, r6, v4) - VEXTUBRX(r4, r6, v5) - subf r3, r4, r5 - extsw r3, r3 - blr - - .align 4 -L(ret0): - li r9, 0 -L(ret1): - mr r3, r9 - blr - - /* The code now checks if r8 and r5 are different by issuing a - cmpb and shifts the result based on its output: - - leadzero = (__builtin_ffsl (z1) - 1); - leadzero = leadzero > (n-1)*8 ? (n-1)*8 : leadzero; - r1 = (r1 >> leadzero) & 0xFFUL; - r2 = (r2 >> leadzero) & 0xFFUL; - return r1 - r2; */ - - .align 4 -L(different1): - neg r11, r8 - sldi r5, r5, 3 - and r8, r11, r8 - addi r5, r5, -8 - cntlzd r8, r8 - subfic r8, r8, 63 - extsw r8, r8 - cmpld cr7, r8, r5 - ble cr7, L(different2) - mr r8, r5 -L(different2): - extsw r8, r8 - srd r7, r7, r8 - srd r9, r9, r8 - rldicl r3, r7, 0, 56 - rldicl r9, r9, 0, 56 - subf r9, r9, 3 - extsw r9, r9 - mr r3, r9 - blr - - /* If unaligned 16 bytes reads across a 4K page boundary, it uses - a simple byte a byte comparison until the page alignment for s1 - is reached. */ - .align 4 -L(pagecross): - lbz r7, 0(r3) - lbz r9, 0(r4) - subfic r8, r8,4095 - cmplw cr7, r9, r7 - bne cr7, L(byte_ne_3) - cmpdi cr7, r9, 0 - beq cr7, L(byte_ne_0) - addi r5, r5, -1 - subf r7, r8, r5 - subf r9, r7, r5 - addi r9, r9, 1 - mtctr r9 - b L(pagecross_loop1) - - .align 4 -L(pagecross_loop0): - beq cr7, L(ret0) - lbz r9, 0(r3) - lbz r8, 0(r4) - addi r5, r5, -1 - cmplw cr7, r9, r8 - cmpdi cr5, r9, 0 - bne cr7, L(byte_ne_2) - beq cr5, L(byte_ne_0) -L(pagecross_loop1): - cmpdi cr7, r5, 0 - addi r3, r3, 1 - addi r4, r4, 1 - bdnz L(pagecross_loop0) - cmpdi cr7, r7, 0 - li r9, 0 - bne+ cr7, L(align) - b L(ret1) - - .align 4 -L(byte_ne_0): - li r7, 0 -L(byte_ne_1): - subf r9, r9, r7 - extsw r9, r9 - b L(ret1) - - .align 4 -L(byte_ne_2): - extsw r7, r9 - mr r9, r8 - b L(byte_ne_1) -L(byte_ne_3): - extsw r7, r7 - b L(byte_ne_1) -END(STRNCMP) -libc_hidden_builtin_def(strncmp) -#else -#include <sysdeps/powerpc/powerpc64/power8/strncmp.S> -#endif |