/
z_Linux_asm.s
1586 lines (1279 loc) · 35.9 KB
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z_Linux_asm.s
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// z_Linux_asm.s: - microtasking routines specifically
// written for Intel platforms running Linux* OS
//
////===----------------------------------------------------------------------===//
////
//// The LLVM Compiler Infrastructure
////
//// This file is dual licensed under the MIT and the University of Illinois Open
//// Source Licenses. See LICENSE.txt for details.
////
////===----------------------------------------------------------------------===//
//
// -----------------------------------------------------------------------
// macros
// -----------------------------------------------------------------------
#include "kmp_config.h"
#if KMP_ARCH_X86 || KMP_ARCH_X86_64
# if KMP_MIC
//
// the 'delay r16/r32/r64' should be used instead of the 'pause'.
// The delay operation has the effect of removing the current thread from
// the round-robin HT mechanism, and therefore speeds up the issue rate of
// the other threads on the same core.
//
// A value of 0 works fine for <= 2 threads per core, but causes the EPCC
// barrier time to increase greatly for 3 or more threads per core.
//
// A value of 100 works pretty well for up to 4 threads per core, but isn't
// quite as fast as 0 for 2 threads per core.
//
// We need to check what happens for oversubscription / > 4 threads per core.
// It is possible that we need to pass the delay value in as a parameter
// that the caller determines based on the total # threads / # cores.
//
//.macro pause_op
// mov $100, %rax
// delay %rax
//.endm
# else
# define pause_op .byte 0xf3,0x90
# endif // KMP_MIC
# if KMP_OS_DARWIN
# define KMP_PREFIX_UNDERSCORE(x) _##x // extra underscore for OS X* symbols
# define KMP_LABEL(x) L_##x // form the name of label
.macro KMP_CFI_DEF_OFFSET
.endmacro
.macro KMP_CFI_OFFSET
.endmacro
.macro KMP_CFI_REGISTER
.endmacro
.macro KMP_CFI_DEF
.endmacro
.macro ALIGN
.align $0
.endmacro
.macro DEBUG_INFO
/* Not sure what .size does in icc, not sure if we need to do something
similar for OS X*.
*/
.endmacro
.macro PROC
ALIGN 4
.globl KMP_PREFIX_UNDERSCORE($0)
KMP_PREFIX_UNDERSCORE($0):
.endmacro
# else // KMP_OS_DARWIN
# define KMP_PREFIX_UNDERSCORE(x) x // no extra underscore for Linux* OS symbols
// Format labels so that they don't override function names in gdb's backtraces
// MIC assembler doesn't accept .L syntax, the L works fine there (as well as on OS X*)
# if KMP_MIC
# define KMP_LABEL(x) L_##x // local label
# else
# define KMP_LABEL(x) .L_##x // local label hidden from backtraces
# endif // KMP_MIC
.macro ALIGN size
.align 1<<(\size)
.endm
.macro DEBUG_INFO proc
.cfi_endproc
// Not sure why we need .type and .size for the functions
.align 16
.type \proc,@function
.size \proc,.-\proc
.endm
.macro PROC proc
ALIGN 4
.globl KMP_PREFIX_UNDERSCORE(\proc)
KMP_PREFIX_UNDERSCORE(\proc):
.cfi_startproc
.endm
.macro KMP_CFI_DEF_OFFSET sz
.cfi_def_cfa_offset \sz
.endm
.macro KMP_CFI_OFFSET reg, sz
.cfi_offset \reg,\sz
.endm
.macro KMP_CFI_REGISTER reg
.cfi_def_cfa_register \reg
.endm
.macro KMP_CFI_DEF reg, sz
.cfi_def_cfa \reg,\sz
.endm
# endif // KMP_OS_DARWIN
#endif // KMP_ARCH_X86 || KMP_ARCH_x86_64
#if KMP_OS_LINUX && KMP_ARCH_AARCH64
# define KMP_PREFIX_UNDERSCORE(x) x // no extra underscore for Linux* OS symbols
// Format labels so that they don't override function names in gdb's backtraces
# define KMP_LABEL(x) .L_##x // local label hidden from backtraces
.macro ALIGN size
.align 1<<(\size)
.endm
.macro DEBUG_INFO proc
.cfi_endproc
// Not sure why we need .type and .size for the functions
ALIGN 2
.type \proc,@function
.size \proc,.-\proc
.endm
.macro PROC proc
ALIGN 2
.globl KMP_PREFIX_UNDERSCORE(\proc)
KMP_PREFIX_UNDERSCORE(\proc):
.cfi_startproc
.endm
#endif // KMP_OS_LINUX && KMP_ARCH_AARCH64
// -----------------------------------------------------------------------
// data
// -----------------------------------------------------------------------
#ifdef KMP_GOMP_COMPAT
//
// Support for unnamed common blocks.
//
// Because the symbol ".gomp_critical_user_" contains a ".", we have to
// put this stuff in assembly.
//
# if KMP_ARCH_X86
# if KMP_OS_DARWIN
.data
.comm .gomp_critical_user_,32
.data
.globl ___kmp_unnamed_critical_addr
___kmp_unnamed_critical_addr:
.long .gomp_critical_user_
# else /* Linux* OS */
.data
.comm .gomp_critical_user_,32,8
.data
ALIGN 4
.global __kmp_unnamed_critical_addr
__kmp_unnamed_critical_addr:
.4byte .gomp_critical_user_
.type __kmp_unnamed_critical_addr,@object
.size __kmp_unnamed_critical_addr,4
# endif /* KMP_OS_DARWIN */
# endif /* KMP_ARCH_X86 */
# if KMP_ARCH_X86_64
# if KMP_OS_DARWIN
.data
.comm .gomp_critical_user_,32
.data
.globl ___kmp_unnamed_critical_addr
___kmp_unnamed_critical_addr:
.quad .gomp_critical_user_
# else /* Linux* OS */
.data
.comm .gomp_critical_user_,32,8
.data
ALIGN 8
.global __kmp_unnamed_critical_addr
__kmp_unnamed_critical_addr:
.8byte .gomp_critical_user_
.type __kmp_unnamed_critical_addr,@object
.size __kmp_unnamed_critical_addr,8
# endif /* KMP_OS_DARWIN */
# endif /* KMP_ARCH_X86_64 */
#endif /* KMP_GOMP_COMPAT */
#if KMP_ARCH_X86 && !KMP_ARCH_PPC64
// -----------------------------------------------------------------------
// microtasking routines specifically written for IA-32 architecture
// running Linux* OS
// -----------------------------------------------------------------------
//
.ident "Intel Corporation"
.data
ALIGN 4
// void
// __kmp_x86_pause( void );
//
.text
PROC __kmp_x86_pause
pause_op
ret
DEBUG_INFO __kmp_x86_pause
//
// void
// __kmp_x86_cpuid( int mode, int mode2, void *cpuid_buffer );
//
PROC __kmp_x86_cpuid
pushl %ebp
movl %esp,%ebp
pushl %edi
pushl %ebx
pushl %ecx
pushl %edx
movl 8(%ebp), %eax
movl 12(%ebp), %ecx
cpuid // Query the CPUID for the current processor
movl 16(%ebp), %edi
movl %eax, 0(%edi)
movl %ebx, 4(%edi)
movl %ecx, 8(%edi)
movl %edx, 12(%edi)
popl %edx
popl %ecx
popl %ebx
popl %edi
movl %ebp, %esp
popl %ebp
ret
DEBUG_INFO __kmp_x86_cpuid
# if !KMP_ASM_INTRINS
//------------------------------------------------------------------------
//
// kmp_int32
// __kmp_test_then_add32( volatile kmp_int32 *p, kmp_int32 d );
//
PROC __kmp_test_then_add32
movl 4(%esp), %ecx
movl 8(%esp), %eax
lock
xaddl %eax,(%ecx)
ret
DEBUG_INFO __kmp_test_then_add32
//------------------------------------------------------------------------
//
// FUNCTION __kmp_xchg_fixed8
//
// kmp_int32
// __kmp_xchg_fixed8( volatile kmp_int8 *p, kmp_int8 d );
//
// parameters:
// p: 4(%esp)
// d: 8(%esp)
//
// return: %al
PROC __kmp_xchg_fixed8
movl 4(%esp), %ecx // "p"
movb 8(%esp), %al // "d"
lock
xchgb %al,(%ecx)
ret
DEBUG_INFO __kmp_xchg_fixed8
//------------------------------------------------------------------------
//
// FUNCTION __kmp_xchg_fixed16
//
// kmp_int16
// __kmp_xchg_fixed16( volatile kmp_int16 *p, kmp_int16 d );
//
// parameters:
// p: 4(%esp)
// d: 8(%esp)
// return: %ax
PROC __kmp_xchg_fixed16
movl 4(%esp), %ecx // "p"
movw 8(%esp), %ax // "d"
lock
xchgw %ax,(%ecx)
ret
DEBUG_INFO __kmp_xchg_fixed16
//------------------------------------------------------------------------
//
// FUNCTION __kmp_xchg_fixed32
//
// kmp_int32
// __kmp_xchg_fixed32( volatile kmp_int32 *p, kmp_int32 d );
//
// parameters:
// p: 4(%esp)
// d: 8(%esp)
//
// return: %eax
PROC __kmp_xchg_fixed32
movl 4(%esp), %ecx // "p"
movl 8(%esp), %eax // "d"
lock
xchgl %eax,(%ecx)
ret
DEBUG_INFO __kmp_xchg_fixed32
//
// kmp_int8
// __kmp_compare_and_store8( volatile kmp_int8 *p, kmp_int8 cv, kmp_int8 sv );
//
PROC __kmp_compare_and_store8
movl 4(%esp), %ecx
movb 8(%esp), %al
movb 12(%esp), %dl
lock
cmpxchgb %dl,(%ecx)
sete %al // if %al == (%ecx) set %al = 1 else set %al = 0
and $1, %eax // sign extend previous instruction
ret
DEBUG_INFO __kmp_compare_and_store8
//
// kmp_int16
// __kmp_compare_and_store16( volatile kmp_int16 *p, kmp_int16 cv, kmp_int16 sv );
//
PROC __kmp_compare_and_store16
movl 4(%esp), %ecx
movw 8(%esp), %ax
movw 12(%esp), %dx
lock
cmpxchgw %dx,(%ecx)
sete %al // if %ax == (%ecx) set %al = 1 else set %al = 0
and $1, %eax // sign extend previous instruction
ret
DEBUG_INFO __kmp_compare_and_store16
//
// kmp_int32
// __kmp_compare_and_store32( volatile kmp_int32 *p, kmp_int32 cv, kmp_int32 sv );
//
PROC __kmp_compare_and_store32
movl 4(%esp), %ecx
movl 8(%esp), %eax
movl 12(%esp), %edx
lock
cmpxchgl %edx,(%ecx)
sete %al // if %eax == (%ecx) set %al = 1 else set %al = 0
and $1, %eax // sign extend previous instruction
ret
DEBUG_INFO __kmp_compare_and_store32
//
// kmp_int32
// __kmp_compare_and_store64( volatile kmp_int64 *p, kmp_int64 cv, kmp_int64 sv );
//
PROC __kmp_compare_and_store64
pushl %ebp
movl %esp, %ebp
pushl %ebx
pushl %edi
movl 8(%ebp), %edi
movl 12(%ebp), %eax // "cv" low order word
movl 16(%ebp), %edx // "cv" high order word
movl 20(%ebp), %ebx // "sv" low order word
movl 24(%ebp), %ecx // "sv" high order word
lock
cmpxchg8b (%edi)
sete %al // if %edx:eax == (%edi) set %al = 1 else set %al = 0
and $1, %eax // sign extend previous instruction
popl %edi
popl %ebx
movl %ebp, %esp
popl %ebp
ret
DEBUG_INFO __kmp_compare_and_store64
//
// kmp_int8
// __kmp_compare_and_store_ret8( volatile kmp_int8 *p, kmp_int8 cv, kmp_int8 sv );
//
PROC __kmp_compare_and_store_ret8
movl 4(%esp), %ecx
movb 8(%esp), %al
movb 12(%esp), %dl
lock
cmpxchgb %dl,(%ecx)
ret
DEBUG_INFO __kmp_compare_and_store_ret8
//
// kmp_int16
// __kmp_compare_and_store_ret16( volatile kmp_int16 *p, kmp_int16 cv, kmp_int16 sv );
//
PROC __kmp_compare_and_store_ret16
movl 4(%esp), %ecx
movw 8(%esp), %ax
movw 12(%esp), %dx
lock
cmpxchgw %dx,(%ecx)
ret
DEBUG_INFO __kmp_compare_and_store_ret16
//
// kmp_int32
// __kmp_compare_and_store_ret32( volatile kmp_int32 *p, kmp_int32 cv, kmp_int32 sv );
//
PROC __kmp_compare_and_store_ret32
movl 4(%esp), %ecx
movl 8(%esp), %eax
movl 12(%esp), %edx
lock
cmpxchgl %edx,(%ecx)
ret
DEBUG_INFO __kmp_compare_and_store_ret32
//
// kmp_int64
// __kmp_compare_and_store_ret64( volatile kmp_int64 *p, kmp_int64 cv, kmp_int64 sv );
//
PROC __kmp_compare_and_store_ret64
pushl %ebp
movl %esp, %ebp
pushl %ebx
pushl %edi
movl 8(%ebp), %edi
movl 12(%ebp), %eax // "cv" low order word
movl 16(%ebp), %edx // "cv" high order word
movl 20(%ebp), %ebx // "sv" low order word
movl 24(%ebp), %ecx // "sv" high order word
lock
cmpxchg8b (%edi)
popl %edi
popl %ebx
movl %ebp, %esp
popl %ebp
ret
DEBUG_INFO __kmp_compare_and_store_ret64
//------------------------------------------------------------------------
//
// FUNCTION __kmp_xchg_real32
//
// kmp_real32
// __kmp_xchg_real32( volatile kmp_real32 *addr, kmp_real32 data );
//
// parameters:
// addr: 4(%esp)
// data: 8(%esp)
//
// return: %eax
PROC __kmp_xchg_real32
pushl %ebp
movl %esp, %ebp
subl $4, %esp
pushl %esi
movl 4(%ebp), %esi
flds (%esi)
// load <addr>
fsts -4(%ebp)
// store old value
movl 8(%ebp), %eax
lock
xchgl %eax, (%esi)
flds -4(%ebp)
// return old value
popl %esi
movl %ebp, %esp
popl %ebp
ret
DEBUG_INFO __kmp_xchg_real32
# endif /* !KMP_ASM_INTRINS */
//------------------------------------------------------------------------
//
// FUNCTION __kmp_load_x87_fpu_control_word
//
// void
// __kmp_load_x87_fpu_control_word( kmp_int16 *p );
//
// parameters:
// p: 4(%esp)
//
PROC __kmp_load_x87_fpu_control_word
movl 4(%esp), %eax
fldcw (%eax)
ret
DEBUG_INFO __kmp_load_x87_fpu_control_word
//------------------------------------------------------------------------
//
// FUNCTION __kmp_store_x87_fpu_control_word
//
// void
// __kmp_store_x87_fpu_control_word( kmp_int16 *p );
//
// parameters:
// p: 4(%esp)
//
PROC __kmp_store_x87_fpu_control_word
movl 4(%esp), %eax
fstcw (%eax)
ret
DEBUG_INFO __kmp_store_x87_fpu_control_word
//------------------------------------------------------------------------
//
// FUNCTION __kmp_clear_x87_fpu_status_word
//
// void
// __kmp_clear_x87_fpu_status_word();
//
//
PROC __kmp_clear_x87_fpu_status_word
fnclex
ret
DEBUG_INFO __kmp_clear_x87_fpu_status_word
//------------------------------------------------------------------------
//
// typedef void (*microtask_t)( int *gtid, int *tid, ... );
//
// int
// __kmp_invoke_microtask( microtask_t pkfn, int gtid, int tid,
// int argc, void *p_argv[] ) {
// (*pkfn)( & gtid, & gtid, argv[0], ... );
// return 1;
// }
// -- Begin __kmp_invoke_microtask
// mark_begin;
PROC __kmp_invoke_microtask
pushl %ebp
KMP_CFI_DEF_OFFSET 8
KMP_CFI_OFFSET ebp,-8
movl %esp,%ebp // establish the base pointer for this routine.
KMP_CFI_REGISTER ebp
subl $8,%esp // allocate space for two local variables.
// These varibales are:
// argv: -4(%ebp)
// temp: -8(%ebp)
//
pushl %ebx // save %ebx to use during this routine
//
#if OMPT_SUPPORT
movl 28(%ebp),%ebx // get exit_frame address
movl %ebp,(%ebx) // save exit_frame
#endif
movl 20(%ebp),%ebx // Stack alignment - # args
addl $2,%ebx // #args +2 Always pass at least 2 args (gtid and tid)
shll $2,%ebx // Number of bytes used on stack: (#args+2)*4
movl %esp,%eax //
subl %ebx,%eax // %esp-((#args+2)*4) -> %eax -- without mods, stack ptr would be this
movl %eax,%ebx // Save to %ebx
andl $0xFFFFFF80,%eax // mask off 7 bits
subl %eax,%ebx // Amount to subtract from %esp
subl %ebx,%esp // Prepare the stack ptr --
// now it will be aligned on 128-byte boundary at the call
movl 24(%ebp),%eax // copy from p_argv[]
movl %eax,-4(%ebp) // into the local variable *argv.
movl 20(%ebp),%ebx // argc is 20(%ebp)
shll $2,%ebx
KMP_LABEL(invoke_2):
cmpl $0,%ebx
jg KMP_LABEL(invoke_4)
jmp KMP_LABEL(invoke_3)
ALIGN 2
KMP_LABEL(invoke_4):
movl -4(%ebp),%eax
subl $4,%ebx // decrement argc.
addl %ebx,%eax // index into argv.
movl (%eax),%edx
pushl %edx
jmp KMP_LABEL(invoke_2)
ALIGN 2
KMP_LABEL(invoke_3):
leal 16(%ebp),%eax // push & tid
pushl %eax
leal 12(%ebp),%eax // push & gtid
pushl %eax
movl 8(%ebp),%ebx
call *%ebx // call (*pkfn)();
movl $1,%eax // return 1;
movl -12(%ebp),%ebx // restore %ebx
leave
KMP_CFI_DEF esp,4
ret
DEBUG_INFO __kmp_invoke_microtask
// -- End __kmp_invoke_microtask
// kmp_uint64
// __kmp_hardware_timestamp(void)
PROC __kmp_hardware_timestamp
rdtsc
ret
DEBUG_INFO __kmp_hardware_timestamp
// -- End __kmp_hardware_timestamp
// -----------------------------------------------------------------------
#endif /* KMP_ARCH_X86 */
#if KMP_ARCH_X86_64
// -----------------------------------------------------------------------
// microtasking routines specifically written for IA-32 architecture and
// Intel(R) 64 running Linux* OS
// -----------------------------------------------------------------------
// -- Machine type P
// mark_description "Intel Corporation";
.ident "Intel Corporation"
// -- .file "z_Linux_asm.s"
.data
ALIGN 4
// To prevent getting our code into .data section .text added to every routine definition for x86_64.
//------------------------------------------------------------------------
//
// FUNCTION __kmp_x86_cpuid
//
// void
// __kmp_x86_cpuid( int mode, int mode2, void *cpuid_buffer );
//
// parameters:
// mode: %edi
// mode2: %esi
// cpuid_buffer: %rdx
.text
PROC __kmp_x86_cpuid
pushq %rbp
movq %rsp,%rbp
pushq %rbx // callee-save register
movl %esi, %ecx // "mode2"
movl %edi, %eax // "mode"
movq %rdx, %rsi // cpuid_buffer
cpuid // Query the CPUID for the current processor
movl %eax, 0(%rsi) // store results into buffer
movl %ebx, 4(%rsi)
movl %ecx, 8(%rsi)
movl %edx, 12(%rsi)
popq %rbx // callee-save register
movq %rbp, %rsp
popq %rbp
ret
DEBUG_INFO __kmp_x86_cpuid
# if !KMP_ASM_INTRINS
//------------------------------------------------------------------------
//
// FUNCTION __kmp_test_then_add32
//
// kmp_int32
// __kmp_test_then_add32( volatile kmp_int32 *p, kmp_int32 d );
//
// parameters:
// p: %rdi
// d: %esi
//
// return: %eax
.text
PROC __kmp_test_then_add32
movl %esi, %eax // "d"
lock
xaddl %eax,(%rdi)
ret
DEBUG_INFO __kmp_test_then_add32
//------------------------------------------------------------------------
//
// FUNCTION __kmp_test_then_add64
//
// kmp_int64
// __kmp_test_then_add64( volatile kmp_int64 *p, kmp_int64 d );
//
// parameters:
// p: %rdi
// d: %rsi
// return: %rax
.text
PROC __kmp_test_then_add64
movq %rsi, %rax // "d"
lock
xaddq %rax,(%rdi)
ret
DEBUG_INFO __kmp_test_then_add64
//------------------------------------------------------------------------
//
// FUNCTION __kmp_xchg_fixed8
//
// kmp_int32
// __kmp_xchg_fixed8( volatile kmp_int8 *p, kmp_int8 d );
//
// parameters:
// p: %rdi
// d: %sil
//
// return: %al
.text
PROC __kmp_xchg_fixed8
movb %sil, %al // "d"
lock
xchgb %al,(%rdi)
ret
DEBUG_INFO __kmp_xchg_fixed8
//------------------------------------------------------------------------
//
// FUNCTION __kmp_xchg_fixed16
//
// kmp_int16
// __kmp_xchg_fixed16( volatile kmp_int16 *p, kmp_int16 d );
//
// parameters:
// p: %rdi
// d: %si
// return: %ax
.text
PROC __kmp_xchg_fixed16
movw %si, %ax // "d"
lock
xchgw %ax,(%rdi)
ret
DEBUG_INFO __kmp_xchg_fixed16
//------------------------------------------------------------------------
//
// FUNCTION __kmp_xchg_fixed32
//
// kmp_int32
// __kmp_xchg_fixed32( volatile kmp_int32 *p, kmp_int32 d );
//
// parameters:
// p: %rdi
// d: %esi
//
// return: %eax
.text
PROC __kmp_xchg_fixed32
movl %esi, %eax // "d"
lock
xchgl %eax,(%rdi)
ret
DEBUG_INFO __kmp_xchg_fixed32
//------------------------------------------------------------------------
//
// FUNCTION __kmp_xchg_fixed64
//
// kmp_int64
// __kmp_xchg_fixed64( volatile kmp_int64 *p, kmp_int64 d );
//
// parameters:
// p: %rdi
// d: %rsi
// return: %rax
.text
PROC __kmp_xchg_fixed64
movq %rsi, %rax // "d"
lock
xchgq %rax,(%rdi)
ret
DEBUG_INFO __kmp_xchg_fixed64
//------------------------------------------------------------------------
//
// FUNCTION __kmp_compare_and_store8
//
// kmp_int8
// __kmp_compare_and_store8( volatile kmp_int8 *p, kmp_int8 cv, kmp_int8 sv );
//
// parameters:
// p: %rdi
// cv: %esi
// sv: %edx
//
// return: %eax
.text
PROC __kmp_compare_and_store8
movb %sil, %al // "cv"
lock
cmpxchgb %dl,(%rdi)
sete %al // if %al == (%rdi) set %al = 1 else set %al = 0
andq $1, %rax // sign extend previous instruction for return value
ret
DEBUG_INFO __kmp_compare_and_store8
//------------------------------------------------------------------------
//
// FUNCTION __kmp_compare_and_store16
//
// kmp_int16
// __kmp_compare_and_store16( volatile kmp_int16 *p, kmp_int16 cv, kmp_int16 sv );
//
// parameters:
// p: %rdi
// cv: %si
// sv: %dx
//
// return: %eax
.text
PROC __kmp_compare_and_store16
movw %si, %ax // "cv"
lock
cmpxchgw %dx,(%rdi)
sete %al // if %ax == (%rdi) set %al = 1 else set %al = 0
andq $1, %rax // sign extend previous instruction for return value
ret
DEBUG_INFO __kmp_compare_and_store16
//------------------------------------------------------------------------
//
// FUNCTION __kmp_compare_and_store32
//
// kmp_int32
// __kmp_compare_and_store32( volatile kmp_int32 *p, kmp_int32 cv, kmp_int32 sv );
//
// parameters:
// p: %rdi
// cv: %esi
// sv: %edx
//
// return: %eax
.text
PROC __kmp_compare_and_store32
movl %esi, %eax // "cv"
lock
cmpxchgl %edx,(%rdi)
sete %al // if %eax == (%rdi) set %al = 1 else set %al = 0
andq $1, %rax // sign extend previous instruction for return value
ret
DEBUG_INFO __kmp_compare_and_store32
//------------------------------------------------------------------------
//
// FUNCTION __kmp_compare_and_store64
//
// kmp_int32
// __kmp_compare_and_store64( volatile kmp_int64 *p, kmp_int64 cv, kmp_int64 sv );
//
// parameters:
// p: %rdi
// cv: %rsi
// sv: %rdx
// return: %eax
.text
PROC __kmp_compare_and_store64
movq %rsi, %rax // "cv"
lock
cmpxchgq %rdx,(%rdi)
sete %al // if %rax == (%rdi) set %al = 1 else set %al = 0