[Poppler-bugs] [Bug 7628] Poppler 0.5.3 crashes with gcc-option -ftree-vectorize

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https://bugs.freedesktop.org/show_bug.cgi?id=7628          
     




------- Additional Comments From matje at lanzone.be  2006-07-26 02:59 -------
After looking around a bit, it seems the problem is in the loop @ line 30. When
compiling it with -ftree-vectorizer-verbose=5 I get:

OutputDev.cc:30: note: Alignment of access forced using peeling.
OutputDev.cc:30: note: Vectorizing an unaligned access.
OutputDev.cc:30: note: LOOP VECTORIZED.
OutputDev.cc:30: note: vectorized 1 loops in function.

The problem seems to be that gcc can't detect if ctm is aligned properly
(because it's a pointer) for vectorization so it just guesses. I tried to find a
solution for this, but nothing really good turned up. The only viable
work-around I found is to replace the loop with individual assignments to copy
the array.

Gcc-devs are currently working on implementing #pragma novector to disable
vectorization for certain loops, but that isn't included yet. I guess that this
is in more ways a gcc-bug then a poppler-bug.          
     
     
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