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author | Gwenolé Beauchesne <gbeauchesne@mandriva.org> | 2003-06-04 18:44:09 +0000 |
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committer | Gwenolé Beauchesne <gbeauchesne@mandriva.org> | 2003-06-04 18:44:09 +0000 |
commit | 4cd6a4a5d7e49d54d53dcf4a6f3393d50bd88e8b (patch) | |
tree | acd4001a266a8713495af7f1b2102b61e67113b0 /mdk-stage1/dietlibc/libm/ipow.c | |
parent | 71b111ec6c4671667a19c6fbe0023d33422535d7 (diff) | |
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Import dietlibc 0.22 + other fixes for AMD64
Diffstat (limited to 'mdk-stage1/dietlibc/libm/ipow.c')
-rw-r--r-- | mdk-stage1/dietlibc/libm/ipow.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/libm/ipow.c b/mdk-stage1/dietlibc/libm/ipow.c new file mode 100644 index 000000000..399986ea1 --- /dev/null +++ b/mdk-stage1/dietlibc/libm/ipow.c @@ -0,0 +1,29 @@ +#define _GNU_SOURCE +#include <math.h> +/* + * This is not standard, but often you only need such this function + * which is much shorter than the generic pow() function. + * + * double ipow ( double mant, int expo ); + */ + +double ipow ( double mant, int expo ) +{ + double ret = 1.; + unsigned int e = expo; /* Some attention is necessary for expo = 2^31 */ + + if ( (int)e < 0 ) { + e = -e; + mant = 1./mant; + } + + while (1) { + if ( e & 1 ) + ret *= mant; + if ( (e >>= 1) == 0 ) + break; + mant *= mant; + } + + return ret; +} |