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cpuinfo: first attempt at SDL_HasNEON() implementation.

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This commit is contained in:
Ryan C. Gordon 2016-11-17 01:15:16 -05:00
parent 84a36758a4
commit 79c41b1692
9 changed files with 67 additions and 2 deletions
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54
src/cpuinfo/SDL_cpuinfo.c
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@ -50,6 +50,15 @@
#include <setjmp.h>
#endif
#if defined(__ANDROID__)
#include <cpu-features.h>
#endif
#if defined(__LINUX__) && HAVE_GETAUXVAL
#include <sys/auxv.h>
#include <asm/hwcap.h>
#endif
#define CPU_HAS_RDTSC 0x00000001
#define CPU_HAS_ALTIVEC 0x00000002
#define CPU_HAS_MMX 0x00000004
@ -61,6 +70,7 @@
#define CPU_HAS_SSE42 0x00000200
#define CPU_HAS_AVX 0x00000400
#define CPU_HAS_AVX2 0x00000800
#define CPU_HAS_NEON 0x00001000
#if SDL_ALTIVEC_BLITTERS && HAVE_SETJMP && !__MACOSX__ && !__OpenBSD__
/* This is the brute force way of detecting instruction sets...
@ -288,6 +298,40 @@ CPU_haveAltiVec(void)
return altivec;
}
static int
CPU_haveNEON(void)
{
int neon = 0;
/* The way you detect NEON is a privileged instruction on ARM, so you have
query the OS kernel in a platform-specific way. :/ */
#ifndef SDL_CPUINFO_DISABLED
#if defined(__APPLE__) && defined(__ARM_ARCH)
/* all hardware that runs iOS 5 and later support NEON, but check anyhow */
size_t length = sizeof (neon);
const int error = sysctlbyname("hw.optional.neon", &neon, &length, NULL, 0);
if (!error)
neon = (neon != 0);
#elif defined(__ANDROID__)
if ( (android_getCpuFamily() == ANDROID_CPU_FAMILY_ARM) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0) ) {
neon = 1;
}
#elif defined(__LINUX__) && HAVE_GETAUXVAL && defined(__arm__)
if (getauxval(AT_HWCAP) & HWCAP_NEON) {
neon = 1;
}
#elif (defined(__WINDOWS__) || defined(__WINRT__)) && defined(_M_ARM)
/* All WinRT ARM devices are required to support NEON, but just in case. */
if (IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE)) {
neon = 1;
}
#endif
#endif
return neon;
}
static int
CPU_have3DNow(void)
{
@ -527,6 +571,9 @@ SDL_GetCPUFeatures(void)
if (CPU_haveAVX2()) {
SDL_CPUFeatures |= CPU_HAS_AVX2;
}
if (CPU_haveNEON()) {
SDL_CPUFeatures |= CPU_HAS_NEON;
}
}
return SDL_CPUFeatures;
}
@ -598,6 +645,12 @@ SDL_HasAVX2(void)
return CPU_FEATURE_AVAILABLE(CPU_HAS_AVX2);
}
SDL_bool
SDL_HasNEON(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_NEON);
}
static int SDL_SystemRAM = 0;
int
@ -667,6 +720,7 @@ main()
printf("SSE4.2: %d\n", SDL_HasSSE42());
printf("AVX: %d\n", SDL_HasAVX());
printf("AVX2: %d\n", SDL_HasAVX2());
printf("NEON: %d\n", SDL_HasNEON());
printf("RAM: %d MB\n", SDL_GetSystemRAM());
return 0;
}