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gcc 4.1 -O1 problem
- From: Kevin Shanahan <kmshanah at disenchant dot net>
- To: gcc-help at gcc dot gnu dot org
- Date: Thu, 16 Mar 2006 15:19:03 +1030
- Subject: gcc 4.1 -O1 problem
Hi,
I've come across a problem with my program when compiling with gcc-4.1
as opposed to gcc-4.0. With 4.1, the sound output comes out as
corrupted. I've narrowed it down to a single source file, and the fact
that it works with -O0 but not -O1.
However, I've tried to find the specific optimisation flag that is
causing the issue and I've come up against the situation below:
If I compile with -O0 and each of the flags below, the sound output is
working again. If I compile with -O1 and each of the options below
changed to -fno-... then the sound corruption is back:
-fdefer-pop
-fdelayed-branch
-fguess-branch-probability
-fcprop-registers
-floop-optimize
-fif-conversion
-fif-conversion2
-ftree-ccp
-ftree-dce
-ftree-dominator-opts
-ftree-dse
-ftree-ter
-ftree-lrs
-ftree-sra
-ftree-copyrename
-ftree-fre
-ftree-ch
-fmerge-constants
Are there any other options besides these which -O1 affects?
Any other ideas as to how I can narrow down the cause?
Thanks,
Kevin.