[cairo] [PATCH] Rely less on FPU for common matrix funcs.

[Bill Spitzak]

0.0 is a denormalized number and must have a specific exponent that 
indicates denormalized.

Because the leading 1 bit is implied and not stored, all non-zero real 
values have a unique exponent that must be used.

Arjen Nienhuis wrote:
> Are FP values always normalized in RAM? I mean can 0.0 be stored as 
> 0.0E1 and would memcmp still work?