[Bug target/53967] GCC produces slow code for convolution algorithm with -mfpmath=sse (the AMD_64 default)

[bfriesen at simple dot dallas.tx.us]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53967

--- Comment #6 from bfriesen at simple dot dallas.tx.us 2012-07-14 21:42:38 UTC 
---
Created attachment 27797
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27797
Pre-processed GraphicsMagick source (effect.c).

In case the small sample (which only illustrates the core algorithm) does not
satisfy, I have attached a pre-processed version of the real GraphicsMagick
code with the performance issue.  Look for ConvolveImage().