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/*
run-time cpu feature detection code
mm, alphabet soup...
Glenn Kennard <d98gk@efd.lth.se>
*/
#include "fitz.h"
/* global run-time constant */
unsigned fz_cpuflags = 0;
#ifndef HAVE_CPUDEP
void fz_accelerate(void)
{
}
void fz_cpudetect(void)
{
}
#else
#ifndef _WIN32
#include <signal.h> /* signal/sigaction */
#include <setjmp.h> /* sigsetjmp/siglongjmp */
#endif
/*
#ifdef _WIN32
#define sigjmp_buf jmp_buf
#define sigsetjmp(a,b) setjmp(a)
#define siglongjmp longjmp
#endif
*/
typedef struct {
void (*test)(void);
const unsigned flag;
const char *name;
} featuretest;
#if defined(ARCH_X86) || defined(ARCH_X86_64)
#ifdef __GNUC__
static void mmx(void)
{ __asm__ ("pand %mm0, %mm0\n\t"); }
static void m3dnow(void)
{ __asm__ ("pavgusb %mm0, %mm0\n\t"); }
static void mmxext(void) /* aka Extended 3DNow! */
{ __asm__ ("pmaxsw %mm0, %mm0\n\t"); }
static void sse(void)
{ __asm__ ("andps %xmm0, %xmm0\n\t"); }
static void sse2(void)
{ __asm__ ("andpd %xmm0, %xmm0\n\t"); }
/*
static void sse3(void)
{ __asm__ ("haddps %%xmm0, %%xmm0\n\t" : : : "%xmm0"); }
*/
#else
static void mmx(void)
{ __asm pand mm0, mm0; }
static void m3dnow(void)
{ __asm pavgusb mm0, mm0; }
static void mmxext(void) /* aka Extended 3DNow! */
{ __asm pmaxsw mm0, mm0; }
static void sse(void)
{ __asm andps xmm0, xmm0; }
static void sse2(void)
{ __asm andpd xmm0, xmm0; }
#endif
#ifdef ARCH_X86_64
static void amd64(void)
#ifdef __GNUC__
{ __asm__ ("and %rax, %rax\n\t"); }
#else
{ __asm and rax, rax; }
#endif
#endif
static const featuretest features[] = {
{ mmx, HAVE_MMX, "mmx" },
{ m3dnow, HAVE_3DNOW, "3dnow" },
{ mmxext, HAVE_MMXEXT, "mmxext" },
{ sse, HAVE_SSE, "sse" },
{ sse2, HAVE_SSE2, "sse2" },
/* { sse3, HAVE_SSE3, "sse3" }, */
#ifdef ARCH_X86_64
{ amd64, HAVE_AMD64, "amd64" }
#endif
};
#endif
static int
enabled(char *env, const char *ext)
{
int len;
char *s;
if (!env)
return 1;
len = strlen(ext);
s = env;
while ((s = strstr(s, ext)))
{
int atstart = s == env || *(s-1) == ',' || *(s-1) == ' ';
s += len;
if (atstart && (*s == ' ' || *s == ',' || *s == '\0')) {
return 1;
}
}
return 0;
}
static void
dumpflags(void)
{
unsigned f = fz_cpuflags;
int i, n;
fputs("detected cpu features:", stdout);
n = 0;
for (i = 0; i < sizeof(features) / sizeof(featuretest); i++)
{
if (f & features[i].flag)
{
fputc(' ', stdout);
fputs(features[i].name, stdout);
n ++;
}
}
if (!n)
fputs(" none", stdout);
fputc('\n', stdout);
}
#ifndef _WIN32
static sigjmp_buf jmpbuf;
static volatile sig_atomic_t canjump;
static void
sigillhandler(int sig)
{
if (!canjump) {
signal(sig, SIG_DFL);
raise(sig);
}
canjump = 0;
siglongjmp(jmpbuf, 1);
}
void fz_cpudetect(void)
{
static int hasrun = 0;
unsigned flags = 0;
int i;
void (*oldhandler)(int) = NULL;
void (*tmphandler)(int);
char *env;
if (hasrun)
return;
hasrun = 1;
env = getenv("CPUACCEL");
for (i = 0; i < sizeof(features) / sizeof(featuretest); i++)
{
canjump = 0;
tmphandler = signal(SIGILL, sigillhandler);
if (!oldhandler)
oldhandler = tmphandler;
if (sigsetjmp(jmpbuf, 1))
{
/* test failed - disable feature */
flags &= ~features[i].flag;
continue;
}
canjump = 1;
features[i].test();
#if defined(ARCH_X86) || defined(ARCH_X86_64)
/* reset mmx/x87 pipeline state */
if (features[i].flag & (HAVE_MMX | HAVE_3DNOW | HAVE_MMXEXT)) {
__asm__ __volatile__ ("emms\n\t");
}
#endif
/* if we got here the test succeeded */
if (enabled(env, features[i].name))
flags |= features[i].flag;
else
flags &= ~features[i].flag;
}
/* restore previous signal handler */
signal(SIGILL, oldhandler);
fz_cpuflags = flags;
#if defined(ARCH_X86) || defined(ARCH_X86_64)
__asm__ __volatile__ ("emms\n\t");
#endif
dumpflags();
}
#else /* _WIN32 */
void fz_cpudetect(void)
{
static int hasrun = 0;
unsigned flags = 0;
int i;
char *env;
if (hasrun)
return;
hasrun = 1;
env = getenv("CPUACCEL");
for (i = 0; i < sizeof(features) / sizeof(featuretest); i++)
{
__try
{
features[i].test();
}
__except(EXCEPTION_EXECUTE_HANDLER)
{
/* test failed - disable feature */
flags &= ~features[i].flag;
continue;
}
#if defined(ARCH_X86) || defined(ARCH_X86_64)
if (features[i].flag & (HAVE_MMX | HAVE_3DNOW | HAVE_MMXEXT)) {
/* reset mmx/x87 pipeline state */
__asm emms;
}
#endif
/* if we got here the test succeeded */
if (enabled(env, features[i].name))
flags |= features[i].flag;
else
flags &= ~features[i].flag;
}
fz_cpuflags = flags;
dumpflags();
}
#endif
#endif
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