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GitHub Repository: hrydgard/ppsspp
 Path: blob/master/Common/Math/math_util.cpp
Views: 1401
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#include "Common/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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