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| author | Quincey Koziol <koziol@hdfgroup.org> | 2004-01-31 15:28:40 (GMT) |
|---|---|---|
| committer | Quincey Koziol <koziol@hdfgroup.org> | 2004-01-31 15:28:40 (GMT) |
| commit | 6cf56ca817ccba7b8c956cffee208ec624921b12 (patch) | |
| tree | e30ab953bdfc4d332ea6c0af192f8ae4893931b3 /src/H5detect.c | |
| parent | eb4cc0556c390deaa9f21710d95f5690932221d9 (diff) | |
| download | hdf5-6cf56ca817ccba7b8c956cffee208ec624921b12.zip hdf5-6cf56ca817ccba7b8c956cffee208ec624921b12.tar.gz hdf5-6cf56ca817ccba7b8c956cffee208ec624921b12.tar.bz2 | |
[svn-r8136] Purpose:
Optimization
Description:
Speed up various parts of the library by setting a global variable for the
endianness of the machine at library startup and use that variable instead of
repeatedly querying the endianness of the native int datatype.
Platforms tested:
IBM p690 (copper)
too minor to require h5committest
Diffstat (limited to 'src/H5detect.c')
| -rw-r--r-- | src/H5detect.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/src/H5detect.c b/src/H5detect.c index 670aed1..f3a5588 100644 --- a/src/H5detect.c +++ b/src/H5detect.c @@ -479,7 +479,7 @@ sigbus_handler(int UNUSED signo) static void print_results(int nd, detected_t *d, int na, malign_t *misc_align) { - + int byte_order; int i, j; /* Include files */ @@ -523,6 +523,18 @@ H5TN_init_interface(void)\n\ \n\ FUNC_ENTER_NOAPI(H5TN_init_interface, FAIL);\n"); + /* The native endianess of this machine */ + /* (Use the byte-order of a reasonably large type) */ + for (i = 0; i < nd; i++) + if(d[i].size>1) { + byte_order=d[i].perm[0]; + break; + } /* end if */ + printf("\n\ + /* Set the native order for this machine */\n\ + H5T_native_order_g = H5T_ORDER_%s;\n", + byte_order ? "BE" : "LE"); /*byte order */ + for (i = 0; i < nd; i++) { /* Print a comment to describe this section of definitions. */ @@ -548,6 +560,7 @@ H5TN_init_interface(void)\n\ d[i].perm[0] ? "BE" : "LE", /*byte order */ d[i].offset, /*offset */ d[i].precision); /*precision */ + assert(d[i].size<2 || (d[i].perm[0]>0)==(byte_order>0)); /* Double-check that byte-order doesn't change */ if (0 == d[i].msize) { /* The part unique to fixed point types */ |