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45 lines
1.0 KiB
C++
45 lines
1.0 KiB
C++
#include "math/math_util.h"
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#include <stdlib.h>
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// QNX can only use RunFast mode and it is already the default.
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#if defined(__ARM_ARCH_7A__)
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// Enables 'RunFast' VFP mode.
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void EnableFZ() {
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int x;
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asm(
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"fmrx %[result],FPSCR \r\n"
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"orr %[result],%[result],#16777216 \r\n"
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"fmxr FPSCR,%[result]"
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:[result] "=r" (x) : :
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);
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//printf("ARM FPSCR: %08x\n",x);
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}
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// New fastmode code from: http://pandorawiki.org/Floating_Point_Optimization
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// These settings turbocharge the slow VFP unit on Cortex-A8 based chips by setting
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// restrictions that permit running VFP instructions on the NEON unit.
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// Denormal flush-to-zero, for example.
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void FPU_SetFastMode() {
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static const unsigned int x = 0x04086060;
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static const unsigned int y = 0x03000000;
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int r;
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asm volatile (
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"fmrx %0, fpscr \n\t" //r0 = FPSCR
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"and %0, %0, %1 \n\t" //r0 = r0 & 0x04086060
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"orr %0, %0, %2 \n\t" //r0 = r0 | 0x03000000
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"fmxr fpscr, %0 \n\t" //FPSCR = r0
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: "=r"(r)
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: "r"(x), "r"(y)
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);
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}
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#else
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void EnableFZ() {
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// TODO
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}
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void FPU_SetFastMode() {}
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#endif
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