Fix build error when compiling MIPS SIMD w/ -mfpxx When compiled with -mfpxx (which is now the default on Debian), there are some restrictions on the use of odd-numbered FP registers. More details about FPXX can be found here: https://dmz-portal.mips.com/wiki/MIPS_O32_ABI_-_FR0_and_FR1_Interlinking This commit simply changes all uses of FP registers to an even-numbered equivalent like this: f0 -> f0 f1 -> f2 f2 -> f4 ... f8 -> f16 This commit should have no observable effect except that the MIPS assembly will now compile with -mfpxx. Closes #11