[cairo] [PATCH] Rely less on fast double-precision FPUs
spitzak at gmail.com
Tue Jun 1 13:23:43 PDT 2010
I'm sure this has already been discussed for cairo, but is there a
reason double is used instead of 32-bit float? Many other graphic apis I
have seen use float coordinates and matrices for precisely this reason.
Jonathan Morton wrote:
> ARM CPUs have a big weakness in double-precision floating point. In
> particular, DP FP compares are ridiculously slow, mostly because the
> result of the compare has to be transferred from the FPU to the CPU
> using a serialising instruction.
More information about the cairo