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util: detect AltiVec at runtime on BSDs

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Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Jan Beich <jbeich@FreeBSD.org>
This commit is contained in:
Jan Beich 2019-09-16 11:42:07 +00:00 • committed by Matt Turner
parent 8d2dd1f4f3
commit e892d9337f
1 changed files with 23 additions and 4 deletions
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27
src/util/u_cpu_detect.c
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@ -60,6 +60,9 @@
#include <sys/auxv.h>
#define HAVE_ELF_AUX_INFO
#endif
#if defined(PIPE_ARCH_PPC)
#include <machine/cpu.h>
#endif
#endif
#if defined(PIPE_OS_LINUX)
@ -96,7 +99,7 @@ static int has_cpuid(void);
#endif
#if defined(PIPE_ARCH_PPC) && !defined(PIPE_OS_APPLE) && !defined(PIPE_OS_LINUX)
#if defined(PIPE_ARCH_PPC) && !defined(PIPE_OS_APPLE) && !defined(PIPE_OS_BSD) && !defined(PIPE_OS_LINUX)
static jmp_buf __lv_powerpc_jmpbuf;
static volatile sig_atomic_t __lv_powerpc_canjump = 0;
@ -125,8 +128,12 @@ check_os_altivec_support(void)
#endif
#if defined(__ALTIVEC__) && defined(__VSX__)
/* Do nothing */
#elif defined(PIPE_OS_APPLE)
#elif defined(PIPE_OS_APPLE) || defined(PIPE_OS_NETBSD) || defined(PIPE_OS_OPENBSD)
#ifdef HW_VECTORUNIT
int sels[2] = {CTL_HW, HW_VECTORUNIT};
#else
int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
#endif
int has_vu = 0;
int len = sizeof (has_vu);
int err;
@ -138,7 +145,19 @@ check_os_altivec_support(void)
util_cpu_caps.has_altivec = 1;
}
}
#elif defined(PIPE_OS_LINUX) /* !PIPE_OS_APPLE */
#elif defined(PIPE_OS_FREEBSD) /* !PIPE_OS_APPLE && !PIPE_OS_NETBSD && !PIPE_OS_OPENBSD */
unsigned long hwcap = 0;
#ifdef HAVE_ELF_AUX_INFO
elf_aux_info(AT_HWCAP, &hwcap, sizeof(hwcap));
#else
size_t len = sizeof(hwcap);
sysctlbyname("hw.cpu_features", &hwcap, &len, NULL, 0);
#endif
if (hwcap & PPC_FEATURE_HAS_ALTIVEC)
util_cpu_caps.has_altivec = 1;
if (hwcap & PPC_FEATURE_HAS_VSX)
util_cpu_caps.has_vsx = 1;
#elif defined(PIPE_OS_LINUX) /* !PIPE_OS_FREEBSD */
#if defined(PIPE_ARCH_PPC_64)
Elf64_auxv_t aux;
#else
@ -159,7 +178,7 @@ check_os_altivec_support(void)
}
close(fd);
}
#else /* !PIPE_OS_APPLE && !PIPE_OS_LINUX */
#else /* !PIPE_OS_APPLE && !PIPE_OS_BSD && !PIPE_OS_LINUX */
/* not on Apple/Darwin or Linux, do it the brute-force way */
/* this is borrowed from the libmpeg2 library */
signal(SIGILL, sigill_handler);