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https://github.com/dborth/vbagx.git
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74 lines
1.4 KiB
C
74 lines
1.4 KiB
C
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#ifndef __VBA_FASTMATH_H__
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#define __VBA_FASTMATH_H__
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//
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// ftou: float to unsigned
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//
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inline u32 ftou(f32 f){
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return u32(s32(f));
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}
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//
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// dtou: double to unsigned
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//
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inline u32 dtou(double f){
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return u32(s32(f));
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}
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//
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// utof: unsigned to float
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//
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inline f32 utof(u32 u){
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// Warning! 'u' must be within the signed int range!
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return f32(s32(u));
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}
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//
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// utod: unsigned to double
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//
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inline double utod(u32 u){
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// Warning! 'u' must be within the signed int range!
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return double(s32(u));
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}
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// ===== POWERPC SPECIFIC =====
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//
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// absf: absolute value of a float
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//
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// ===== POWERPC SPECIFIC =====
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inline float absf(float f){
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// THREE instructions!
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volatile float tmp = f;
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// This MUST be "volatile"! Without it the compiler will try to
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// optimize it and ends up using 13 instructions!
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asm("fabs %0, %0 \n\t"
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: "=f" (tmp) //output
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: "f" (tmp) //input
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);
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return tmp;
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}
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// ===== POWERPC SPECIFIC =====
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//
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// absd: absolute value of a double
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//
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// ===== POWERPC SPECIFIC =====
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inline double absd(double d){
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// THREE instructions!
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volatile double tmp = d;
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// This MUST be "volatile"! Without it the compiler will try to
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// optimize it and ends up using 13 instructions!
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asm("fabs %0, %0 \n\t"
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: "=f" (tmp) //output
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: "f" (tmp) //input
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);
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return tmp;
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}
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#endif
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