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|
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 2002 Advanced Micro Devices, Inc.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the
* following conditions are met:
*
* + Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* + Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* + Neither the name of Advanced Micro Devices, Inc. nor the
* names of its contributors may be used to endorse or
* promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL ADVANCED MICRO DEVICES,
* INC. OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* It is licensee's responsibility to comply with any export
* regulations applicable in licensee's jurisdiction.
*/
.ident "%Z%%M% %I% %E% SMI"
.file "%M%"
#include "SYS.h"
#include "cache.h"
#define LABEL(s) .strcmp/**/s
#ifdef USE_AS_STRNCMP
ENTRY(strncmp)
#else
ENTRY(strcmp) /* (const char *, const char *) */
#endif
xor %ecx, %ecx
#ifdef USE_AS_STRNCMP
test %rdx, %rdx /* (const char *, const char *, size_t) */
mov %r14, -8 (%rsp)
mov %rdx, %r14
mov %edx, %eax
jz LABEL(exitz) /* early exit */
#endif
LABEL(aligntry):
mov %rsi, %r8 /* align by "source" */
and $8 - 1, %r8 /* between 0 and 8 characters compared */
jz LABEL(alignafter)
LABEL(align):
sub $8, %r8
.p2align 4
LABEL(alignloop):
mov (%rsi, %rcx), %al
mov (%rdi, %rcx), %dl
#ifdef USE_AS_STRNCMP
dec %r14
jl LABEL(exitafter)
#endif
cmp %dl, %al /* check if same character */
jne LABEL(exitafter)
test %al, %al /* check if character a NUL */
jz LABEL(exitafter)
inc %ecx
inc %r8
jnz LABEL(alignloop)
.p2align 4
LABEL(alignafter):
mov %r15, -32 (%rsp)
mov %rbp, -24 (%rsp)
mov %rbx, -16 (%rsp)
LABEL(pagealigntry): /* page align by "destination" */
lea (%rdi, %rcx), %ebp
mov $AMD64PAGESIZE, %r15d
and $AMD64PAGEMASK, %ebp
sub %r15d, %ebp
LABEL(64): /* 64-byte */
mov $0xfefefefefefefeff, %rbx /* magic number */
.p2align 4
LABEL(64loop):
add $64, %ebp /* check if "destination" crosses a page unevenly */
jle LABEL(64gobble)
sub %r15d, %ebp
lea 64 (%rcx), %r8
.p2align 4
LABEL(64nibble):
mov (%rsi, %rcx), %al
mov (%rdi, %rcx), %dl
#ifdef USE_AS_STRNCMP
dec %r14
jl LABEL(exit)
#endif
cmp %dl, %al /* check if same character */
jne LABEL(exit)
test %al, %al /* check if character a NUL */
jz LABEL(exit)
inc %ecx
cmp %ecx, %r8d
ja LABEL(64nibble)
.p2align 4
LABEL(64gobble):
mov (%rsi, %rcx), %rax
mov (%rdi, %rcx), %rdx
#ifdef USE_AS_STRNCMP
sub $8, %r14
jl LABEL(tail)
#endif
mov %rbx, %r8
add %rax, %r8
sbb %r10, %r10
mov %rbx, %r9
add %rdx, %r9
sbb %r11, %r11
xor %rax, %r8
or %rbx, %r8
sub %r10, %r8
jnz LABEL(tail)
xor %rdx, %r9
or %rbx, %r9
sub %r11, %r9
jnz LABEL(tail)
cmp %rdx, %rax
jne LABEL(tail)
mov 8 (%rsi, %rcx), %rax
mov 8 (%rdi, %rcx), %rdx
add $8, %ecx
#ifdef USE_AS_STRNCMP
sub $8, %r14
jl LABEL(tail)
#endif
mov %rbx, %r8
add %rax, %r8
sbb %r10, %r10
mov %rbx, %r9
add %rdx, %r9
sbb %r11, %r11
xor %rax, %r8
or %rbx, %r8
sub %r10, %r8
jnz LABEL(tail)
xor %rdx, %r9
or %rbx, %r9
sub %r11, %r9
jnz LABEL(tail)
cmp %rdx, %rax
jne LABEL(tail)
mov 8 (%rsi, %rcx), %rax
mov 8 (%rdi, %rcx), %rdx
add $8, %ecx
#ifdef USE_AS_STRNCMP
sub $8, %r14
jl LABEL(tail)
#endif
mov %rbx, %r8
add %rax, %r8
sbb %r10, %r10
mov %rbx, %r9
add %rdx, %r9
sbb %r11, %r11
xor %rax, %r8
or %rbx, %r8
sub %r10, %r8
jnz LABEL(tail)
xor %rdx, %r9
or %rbx, %r9
sub %r11, %r9
jnz LABEL(tail)
cmp %rdx, %rax
jne LABEL(tail)
mov 8 (%rsi, %rcx), %rax
mov 8 (%rdi, %rcx), %rdx
add $8, %ecx
#ifdef USE_AS_STRNCMP
sub $8, %r14
jl LABEL(tail)
#endif
mov %rbx, %r8
add %rax, %r8
sbb %r10, %r10
mov %rbx, %r9
add %rdx, %r9
sbb %r11, %r11
xor %rax, %r8
or %rbx, %r8
sub %r10, %r8
jnz LABEL(tail)
xor %rdx, %r9
or %rbx, %r9
sub %r11, %r9
jnz LABEL(tail)
cmp %rdx, %rax
jne LABEL(tail)
mov 8 (%rsi, %rcx), %rax
mov 8 (%rdi, %rcx), %rdx
add $8, %ecx
#ifdef USE_AS_STRNCMP
sub $8, %r14
jl LABEL(tail)
#endif
mov %rbx, %r8
add %rax, %r8
sbb %r10, %r10
mov %rbx, %r9
add %rdx, %r9
sbb %r11, %r11
xor %rax, %r8
or %rbx, %r8
sub %r10, %r8
jnz LABEL(tail)
xor %rdx, %r9
or %rbx, %r9
sub %r11, %r9
jnz LABEL(tail)
cmp %rdx, %rax
jne LABEL(tail)
mov 8 (%rsi, %rcx), %rax
mov 8 (%rdi, %rcx), %rdx
add $8, %ecx
#ifdef USE_AS_STRNCMP
sub $8, %r14
jl LABEL(tail)
#endif
mov %rbx, %r8
add %rax, %r8
sbb %r10, %r10
mov %rbx, %r9
add %rdx, %r9
sbb %r11, %r11
xor %rax, %r8
or %rbx, %r8
sub %r10, %r8
jnz LABEL(tail)
xor %rdx, %r9
or %rbx, %r9
sub %r11, %r9
jnz LABEL(tail)
cmp %rdx, %rax
jne LABEL(tail)
mov 8 (%rsi, %rcx), %rax
mov 8 (%rdi, %rcx), %rdx
add $8, %ecx
#ifdef USE_AS_STRNCMP
sub $8, %r14
jl LABEL(tail)
#endif
mov %rbx, %r8
add %rax, %r8
sbb %r10, %r10
mov %rbx, %r9
add %rdx, %r9
sbb %r11, %r11
xor %rax, %r8
or %rbx, %r8
sub %r10, %r8
jnz LABEL(tail)
xor %rdx, %r9
or %rbx, %r9
sub %r11, %r9
jnz LABEL(tail)
cmp %rdx, %rax
jne LABEL(tail)
mov 8 (%rsi, %rcx), %rax
mov 8 (%rdi, %rcx), %rdx
add $8, %ecx
#ifdef USE_AS_STRNCMP
sub $8, %r14
jl LABEL(tail)
#endif
mov %rbx, %r8
add %rax, %r8
sbb %r10, %r10
mov %rbx, %r9
add %rdx, %r9
sbb %r11, %r11
xor %rax, %r8
or %rbx, %r8
sub %r10, %r8
jnz LABEL(tail)
xor %rdx, %r9
or %rbx, %r9
sub %r11, %r9
jnz LABEL(tail)
cmp %rdx, %rax
jne LABEL(tail)
add $8, %ecx
jmp LABEL(64loop)
LABEL(64after):
LABEL(tailtry):
LABEL(tail): /* byte tail */
#ifdef USE_AS_STRNCMP
add $7, %r14
#endif
cmp %dl, %al /* check if same character */
jne LABEL(exit)
test %al, %al /* check if character a NUL */
jz LABEL(exit)
shr $8, %rax
shr $8, %rdx
#ifdef USE_AS_STRNCMP
dec %r14
jl LABEL(exit)
#endif
cmp %dl, %al
jne LABEL(exit)
test %al, %al
jz LABEL(exit)
shr $8, %rax
shr $8, %rdx
#ifdef USE_AS_STRNCMP
dec %r14
jl LABEL(exit)
#endif
cmp %dl, %al
jne LABEL(exit)
test %al, %al
jz LABEL(exit)
shr $8, %rax
shr $8, %rdx
#ifdef USE_AS_STRNCMP
dec %r14
jl LABEL(exit)
#endif
cmp %dl, %al
jne LABEL(exit)
test %al, %al
jz LABEL(exit)
shr $8, %rax
shr $8, %rdx
#ifdef USE_AS_STRNCMP
dec %r14
jl LABEL(exit)
#endif
cmp %dl, %al
jne LABEL(exit)
test %al, %al
jz LABEL(exit)
shr $8, %eax
shr $8, %edx
#ifdef USE_AS_STRNCMP
dec %r14
jl LABEL(exit)
#endif
cmp %dl, %al
jne LABEL(exit)
test %al, %al
jz LABEL(exit)
shr $8, %eax
shr $8, %edx
#ifdef USE_AS_STRNCMP
dec %r14
jl LABEL(exit)
#endif
cmp %dl, %al
jne LABEL(exit)
test %al, %al
jz LABEL(exit)
shr $8, %eax
shr $8, %edx
#ifdef USE_AS_STRNCMP
dec %r14
jl LABEL(exit)
#endif
cmp %dl, %al
jne LABEL(exit)
.p2align 4,, 15
LABEL(tailafter):
LABEL(exit):
mov -32 (%rsp), %r15
mov -24 (%rsp), %rbp
mov -16 (%rsp), %rbx
.p2align 4,, 3
LABEL(exitafter):
#ifdef USE_AS_STRNCMP
test %r14, %r14
cmovl %edx, %eax
#endif
movzx %al, %eax
movzx %dl, %edx
sub %eax, %edx
xchg %edx, %eax
#ifdef USE_AS_STRNCMP
LABEL(exitz):
mov -8 (%rsp), %r14
#endif
ret
#ifdef USE_AS_STRNCMP
SET_SIZE(strncmp)
#else
SET_SIZE(strcmp) /* (const char *, const char *) */
#endif
|
