diff options
Diffstat (limited to 'lib')
-rw-r--r-- | lib/libpbm3.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/lib/libpbm3.c b/lib/libpbm3.c index cb6edd5b..9c9bbd25 100644 --- a/lib/libpbm3.c +++ b/lib/libpbm3.c @@ -14,9 +14,21 @@ #include "libpbm.h" #include "bitreverse.h" -#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 301) && defined (__SSE__) -/* intel MMX-SSE enhancement for pbm_writepbmowraw() */ -/* GCC only. Turn on with -msse */ +/* HAVE_MMX_SSE means we have the means to use MMX and SSE CPU facilities + to make PBM raster processing faster. + + The GNU Compiler -msse option makes SSE available. +*/ + +#if defined(__GNUC__) && \ + (__GNUC__ * 100 + __GNUC_MINOR__ >= 301) && \ + (__GNUC__ * 100 + __GNUC_MINOR__ < 403) && \ + defined (__SSE__) +/* GCC 4.3 does have the facility, but it is different from what this + code knows how to use. In particular, the calls to + __builtin_ia32_pcmpeqb() and __builtin_ia32_pmovmskb() fail to + compile, with complaints of improper argument types. +*/ #define HAVE_MMX_SSE 1 #else |