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Improve ARM runtime feature detection on Linux 

getauxval(AT_HWCAP) is the best way to check for features on ARM and
AArch64, as it doesn’t require parsing a file, instead it just returns a
value provided by the kernel in our address space.

This commit should be synchronised with
https://github.com/libretro/libretro-common/pull/176
This commit is contained in:
Emmanuel Gil Peyrot 2020-11-04 00:24:05 +00:00
parent 7a7c1fbfc3
commit 907cbf8308
1 changed files with 20 additions and 0 deletions
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20
desmume/src/libretro-common/features/features_cpu.c
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@ -311,8 +311,27 @@ static void arm_enable_runfast_mode(void)
#endif #endif
#if defined(__linux__) && !defined(CPU_X86) #if defined(__linux__) && !defined(CPU_X86)
#if __ARM_ARCH
#include <sys/auxv.h>
#endif
static unsigned char check_arm_cpu_feature(const char* feature) static unsigned char check_arm_cpu_feature(const char* feature)
{ {
#if __ARM_ARCH < 8
uint64_t hwcap = getauxval(AT_HWCAP);
if (!strcmp(feature, "neon"))
return (hwcap & HWCAP_ARM_NEON) != 0;
if (!strcmp(feature, "vfpv3"))
return (hwcap & HWCAP_ARM_VFPv3) != 0;
if (!strcmp(feature, "vfpv4"))
return (hwcap & HWCAP_ARM_VFPv4) != 0;
return 0;
#elif __ARM_ARCH == 8
uint64_t hwcap = getauxval(AT_HWCAP);
if (!strcmp(feature, "asimd"))
return (hwcap & HWCAP_ASIMD) != 0;
return 0;
#else
char line[1024]; char line[1024];
unsigned char status = 0; unsigned char status = 0;
RFILE *fp = filestream_open("/proc/cpuinfo", RFILE_MODE_READ_TEXT, -1); RFILE *fp = filestream_open("/proc/cpuinfo", RFILE_MODE_READ_TEXT, -1);
@ -334,6 +353,7 @@ static unsigned char check_arm_cpu_feature(const char* feature)
filestream_close(fp); filestream_close(fp);
return status; return status;
#endif
} }
#if !defined(_SC_NPROCESSORS_ONLN) #if !defined(_SC_NPROCESSORS_ONLN)