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| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2016-08-13 01:26:41 +0000 |
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| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2016-08-13 01:26:41 +0000 |
| commit | 06010325d67ea23c9ce71438a967fd3b20ecbfc0 (patch) | |
| tree | 8472f947c60ae5af19e2730eaf27014c9f9a9dc6 /pm_config.in.h | |
| parent | fbb8842275994610cdf02145def296e9f3f94abd (diff) | |
| download | netpbm-mirror-06010325d67ea23c9ce71438a967fd3b20ecbfc0.tar.gz netpbm-mirror-06010325d67ea23c9ce71438a967fd3b20ecbfc0.tar.xz netpbm-mirror-06010325d67ea23c9ce71438a967fd3b20ecbfc0.zip | |
Don't do attempt unaligned memory access on machine that can't do that
git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@2809 9d0c8265-081b-0410-96cb-a4ca84ce46f8
Diffstat (limited to 'pm_config.in.h')
| -rw-r--r-- | pm_config.in.h | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/pm_config.in.h b/pm_config.in.h index 72cb477e..d156127e 100644 --- a/pm_config.in.h +++ b/pm_config.in.h @@ -257,12 +257,17 @@ /* UNALIGNED_OK means it's OK to do unaligned memory access, e.g. loading an 8-byte word from an address that is not a multiple of 8. On some systems, such an access causes a trap and a signal. + + This determination is conservative - There may be cases where unaligned + access is OK and we say here it isn't. + + We know unaligned access is _not_ OK on at least SPARC and some ARM. */ -#if defined(__sparc__) -# define UNALIGNED_OK 0 -#else +#if defined(__x86_64__) | defined(__i486__) | defined(__vax__) # define UNALIGNED_OK 1 +#else +# define UNALIGNED_OK 0 #endif |