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Little optimisation attempt targeted only for ARM 32 bits,

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enabling "RunFast" mode ; benefits might depend on the board
 at hand.
This commit is contained in:
David Carlier 2021-04-04 13:15:42 +01:00
parent 557668c35e
commit 159f5e3ae4
1 changed files with 16 additions and 0 deletions
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16
src/backends/generic/misc.c
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@ -188,5 +188,21 @@ void Sys_SetupFPU(void) {
}
#else
void Sys_SetupFPU(void) {
#if defined(__arm__)
// Enable RunFast mode if not enabled already
static const unsigned int bit = 0x04086060;
static const unsigned int fpscr = 0x03000000;
int ret;
asm volatile("fmrx %0, fpscr" : "=r"(ret));
if (ret != fpscr) {
asm volatile("fmrx %0, fpscr\n\t"
"and %0, %0, %1\n\t"
"orr %0, %0, %2\n\t"
"fmxr fpscr, %0"
: "=r"(ret)
: "r"(bit), "r"(fpscr));
}
#endif
}
#endif