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(ARM) (NEON) Enable ARM runfast mode - see http://infocenter.arm.com/help/topic/com.arm.doc.ddi0274h/Chdiihcd.html - found this inside the code for Mupen64

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(glN64 ES2 driver)
This commit is contained in:
twinaphex 2013-12-30 07:58:18 +01:00
parent defb6efc5a
commit e80e63788e
1 changed files with 24 additions and 0 deletions
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24
performance.c
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@ -259,6 +259,23 @@ static uint64_t xgetbv_x86(uint32_t index)
}
#endif
#ifdef HAVE_NEON
static void arm_enable_runfast_mode(void)
{
static const unsigned int x = 0x04086060;
static const unsigned int y = 0x03000000;
int r;
asm volatile(
"fmrx %0, fpscr \n\t" //r0 = FPSCR
"and %0, %0, %1 \n\t" //r0 = r0 & 0x04086060
"orr %0, %0, %2 \n\t" //r0 = r0 | 0x03000000
"fmxr fpscr, %0 \n\t" //FPSCR = r0
: "=r"(r)
: "r"(x), "r"(y)
);
}
#endif
uint64_t rarch_get_cpu_features(void)
{
uint64_t cpu = 0;
@ -305,13 +322,20 @@ uint64_t rarch_get_cpu_features(void)
RARCH_LOG("[CPUID]: AVX: %u\n", !!(cpu & RETRO_SIMD_AVX));
#elif defined(ANDROID) && defined(ANDROID_ARM)
uint64_t cpu_flags = android_getCpuFeatures();
(void)cpu_flags;
#ifdef HAVE_NEON
if (cpu_flags & ANDROID_CPU_ARM_FEATURE_NEON)
{
cpu |= RETRO_SIMD_NEON;
arm_enable_runfast_mode();
}
#endif
RARCH_LOG("[CPUID]: NEON: %u\n", !!(cpu & RETRO_SIMD_NEON));
#elif defined(HAVE_NEON)
cpu |= RETRO_SIMD_NEON;
arm_enable_runfast_mode();
RARCH_LOG("[CPUID]: NEON: %u\n", !!(cpu & RETRO_SIMD_NEON));
#elif defined(__CELLOS_LV2__)
cpu |= RETRO_SIMD_VMX;