diff options
author | Christopher Faylor <cgf@redhat.com> | 2000-02-17 19:39:46 +0000 |
---|---|---|
committer | Christopher Faylor <cgf@redhat.com> | 2000-02-17 19:39:46 +0000 |
commit | 6d491d8ad9122891d1a48447e8c49702eb678921 (patch) | |
tree | 45619a131b9f211ceca9fce7a866328344bf00ec /newlib/libc/stdlib/__exp10.c | |
parent | bd592806f45307757c24ec3f75bdefe13abfd51f (diff) | |
download | gdb-6d491d8ad9122891d1a48447e8c49702eb678921.tar.gz |
import newlib-2000-02-17 snapshotcvs/SNAPSHOT
Diffstat (limited to 'newlib/libc/stdlib/__exp10.c')
-rw-r--r-- | newlib/libc/stdlib/__exp10.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/newlib/libc/stdlib/__exp10.c b/newlib/libc/stdlib/__exp10.c new file mode 100644 index 00000000000..967362347e7 --- /dev/null +++ b/newlib/libc/stdlib/__exp10.c @@ -0,0 +1,29 @@ +/* + * compute 10**x by successive squaring. + */ + +#include <_ansi.h> + +double +_DEFUN (__exp10, (x), + unsigned x) +{ + static _CONST double powtab[] = + {1.0, + 10.0, + 100.0, + 1000.0, + 10000.0}; + + if (x < (sizeof (powtab) / sizeof (double))) + return powtab[x]; + else if (x & 1) + { + return 10.0 * __exp10 (x - 1); + } + else + { + double n = __exp10 (x / 2); + return n * n; + } +} |