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Comment arm_enable_runfast_mode().

This commit is contained in:
Themaister 2013-12-30 10:19:32 +01:00
parent 6180f3c15a
commit 2ace9a81a8
1 changed files with 7 additions and 6 deletions
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13
performance.c
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@ -262,14 +262,15 @@ static uint64_t xgetbv_x86(uint32_t index)
#ifdef HAVE_NEON #ifdef HAVE_NEON
static void arm_enable_runfast_mode(void) static void arm_enable_runfast_mode(void)
{ {
static const unsigned int x = 0x04086060; // RunFast mode. Enables flush-to-zero and some floating point optimizations.
static const unsigned int y = 0x03000000; static const unsigned x = 0x04086060;
static const unsigned y = 0x03000000;
int r; int r;
asm volatile( asm volatile(
"fmrx %0, fpscr \n\t" //r0 = FPSCR "fmrx %0, fpscr \n\t" // r0 = FPSCR
"and %0, %0, %1 \n\t" //r0 = r0 & 0x04086060 "and %0, %0, %1 \n\t" // r0 = r0 & 0x04086060
"orr %0, %0, %2 \n\t" //r0 = r0 | 0x03000000 "orr %0, %0, %2 \n\t" // r0 = r0 | 0x03000000
"fmxr fpscr, %0 \n\t" //FPSCR = r0 "fmxr fpscr, %0 \n\t" // FPSCR = r0
: "=r"(r) : "=r"(r)
: "r"(x), "r"(y) : "r"(x), "r"(y)
); );