libsbc refactoring

Victor,

I've been meaning to try to simplify the 64-bit fixed point by eliminating the struct that combines two 32-bit values. So now we depend on the compiler to do all 64-bit math. The arm assembly goes out.

Can you try this and make sure it's still performing well on arm?

This makes all the different flavors of math look the same in the basic ops:

#define SBC_FIXED_0(val) {val = 0;}
#define ADD(dst, src) {dst += src;}
#define SUB(dst, src) {dst -= src;}
#define MUL(dst, a, b) {dst = (sbc_fixed_t)a * b;} #define MULA(dst, a, b) {dst += (sbc_fixed_t)a * b;}

so we could even eliminate these macros. I know Marcel would be happy to see them go ;)

Brad

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