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ARM: Create configure option --enable-arm-simd to govern assembly optimizations

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This commit is contained in:
Ben Avison
2019-10-24 21:12:08 -04:00
parent 59beaccd50
commit 6a6a05289e
4 changed files with 99 additions and 1 deletions
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57
src/cpuinfo/SDL_cpuinfo.c
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@@ -96,6 +96,7 @@
#define CPU_HAS_AVX2 (1 << 10)
#define CPU_HAS_NEON (1 << 11)
#define CPU_HAS_AVX512F (1 << 12)
#define CPU_HAS_ARM_SIMD (1 << 13)
#if SDL_ALTIVEC_BLITTERS && HAVE_SETJMP && !__MACOSX__ && !__OpenBSD__
/* This is the brute force way of detecting instruction sets...
@@ -325,7 +326,50 @@ CPU_haveAltiVec(void)
return altivec;
}
#if defined(__LINUX__) && defined(__ARM_ARCH) && !defined(HAVE_GETAUXVAL)
#ifdef __linux__
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <elf.h>
static SDL_bool
CPU_haveARMSIMD(void)
{
int arm_simd = 0;
int fd;
fd = open("/proc/self/auxv", O_RDONLY);
if (fd >= 0)
{
Elf32_auxv_t aux;
while (read(fd, &aux, sizeof aux) == sizeof aux)
{
if (aux.a_type == AT_PLATFORM)
{
const char *plat = (const char *) aux.a_un.a_val;
arm_simd = strncmp(plat, "v6l", 3) == 0 ||
strncmp(plat, "v7l", 3) == 0;
}
}
close(fd);
}
return arm_simd;
}
#else
static SDL_bool
CPU_haveARMSIMD(void)
{
#warning SDL_HasARMSIMD is not implemented for this ARM platform. Write me.
return 0;
}
#endif
#if (defined(__LINUX__) || defined(__ANDROID__)) && defined(__ARM_ARCH) && !defined(HAVE_GETAUXVAL)
static int
readProcAuxvForNeon(void)
{
@@ -668,6 +712,10 @@ SDL_GetCPUFeatures(void)
SDL_CPUFeatures |= CPU_HAS_AVX512F;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 64);
}
if (CPU_haveARMSIMD()) {
SDL_CPUFeatures |= CPU_HAS_ARM_SIMD;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 16);
}
if (CPU_haveNEON()) {
SDL_CPUFeatures |= CPU_HAS_NEON;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 16);
@@ -749,6 +797,12 @@ SDL_HasAVX512F(void)
return CPU_FEATURE_AVAILABLE(CPU_HAS_AVX512F);
}
SDL_bool
SDL_HasARMSIMD(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_ARM_SIMD);
}
SDL_bool
SDL_HasNEON(void)
{
@@ -870,6 +924,7 @@ main()
printf("AVX: %d\n", SDL_HasAVX());
printf("AVX2: %d\n", SDL_HasAVX2());
printf("AVX-512F: %d\n", SDL_HasAVX512F());
printf("ARM SIMD: %d\n", SDL_HasARMSIMD());
printf("NEON: %d\n", SDL_HasNEON());
printf("RAM: %d MB\n", SDL_GetSystemRAM());
return 0;