David Robillard
e0aaed6d65
All #include statements that include a header that is a part of a library bundled with ardour MUST use quotes, not angle brackets. Do this: #include "ardour/types.h" NOT this: #include <ardour/types.h> Rationale: This is best practice in general, to ensure we include the local version and not the system version. That quotes mean "local" (in some sense) and angle brackets mean "system" (in some sense) is a ubiquitous convention and IIRC right in the C spec somewhere. More pragmatically, this is required by (my) waf (stuff) for dependencies to work correctly. That is: !!! FAILURE TO DO THIS CAN RESULT IN BROKEN BUILDS !!! Failure to comply is punishable by death by torture. :) P.S. It's not that dramatic in all cases, but this (in combination with some GCC flags specific to the include type) is the best way I have found to be absolutely 100% positive the local ones are being used (and we definitely want to be absolutely 100% positive on that one). git-svn-id: svn://localhost/ardour2/branches/3.0@4655 d708f5d6-7413-0410-9779-e7cbd77b26cf
98 lines
1.5 KiB
C++
98 lines
1.5 KiB
C++
#define _XOPEN_SOURCE 600
|
|
#include <cstdlib>
|
|
#include <stdint.h>
|
|
|
|
#include "pbd/fpu.h"
|
|
#include "pbd/error.h"
|
|
|
|
#include "i18n.h"
|
|
|
|
using namespace PBD;
|
|
using namespace std;
|
|
|
|
FPU::FPU ()
|
|
{
|
|
unsigned long cpuflags = 0;
|
|
|
|
_flags = Flags (0);
|
|
|
|
#ifndef ARCH_X86
|
|
return;
|
|
#endif
|
|
|
|
#ifndef USE_X86_64_ASM
|
|
asm volatile (
|
|
"mov $1, %%eax\n"
|
|
"pushl %%ebx\n"
|
|
"cpuid\n"
|
|
"movl %%edx, %0\n"
|
|
"popl %%ebx\n"
|
|
: "=r" (cpuflags)
|
|
:
|
|
: "%eax", "%ecx", "%edx", "memory"
|
|
);
|
|
|
|
#else
|
|
|
|
asm volatile (
|
|
"pushq %%rbx\n"
|
|
"movq $1, %%rax\n"
|
|
"cpuid\n"
|
|
"movq %%rdx, %0\n"
|
|
"popq %%rbx\n"
|
|
: "=r" (cpuflags)
|
|
:
|
|
: "%rax", "%rcx", "%rdx", "memory"
|
|
);
|
|
|
|
#endif /* USE_X86_64_ASM */
|
|
|
|
if (cpuflags & (1<<25)) {
|
|
_flags = Flags (_flags | (HasSSE|HasFlushToZero));
|
|
}
|
|
|
|
if (cpuflags & (1<<26)) {
|
|
_flags = Flags (_flags | HasSSE2);
|
|
}
|
|
|
|
if (cpuflags & (1 << 24)) {
|
|
|
|
char* fxbuf = 0;
|
|
|
|
#ifdef NO_POSIX_MEMALIGN
|
|
if ((fxbuf = (char *) malloc(512)) == 0)
|
|
#else
|
|
if (posix_memalign ((void**)&fxbuf, 16, 512))
|
|
#endif
|
|
{
|
|
error << _("cannot allocate 16 byte aligned buffer for h/w feature detection") << endmsg;
|
|
} else {
|
|
|
|
asm volatile (
|
|
"fxsave (%0)"
|
|
:
|
|
: "r" (fxbuf)
|
|
: "memory"
|
|
);
|
|
|
|
uint32_t mxcsr_mask = *((uint32_t*) &fxbuf[28]);
|
|
|
|
/* if the mask is zero, set its default value (from intel specs) */
|
|
|
|
if (mxcsr_mask == 0) {
|
|
mxcsr_mask = 0xffbf;
|
|
}
|
|
|
|
if (mxcsr_mask & (1<<6)) {
|
|
_flags = Flags (_flags | HasDenormalsAreZero);
|
|
}
|
|
|
|
free (fxbuf);
|
|
}
|
|
}
|
|
}
|
|
|
|
FPU::~FPU ()
|
|
{
|
|
}
|