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author | Christopher Faylor <me+cygwin@cgf.cx> | 2000-02-17 19:39:46 +0000 |
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committer | Christopher Faylor <me+cygwin@cgf.cx> | 2000-02-17 19:39:46 +0000 |
commit | 43b55bace5fad27af5da7a99784667363b92c45d (patch) | |
tree | 17fe82f6ba0d93b76d10dd73d4945ab81b69db40 /newlib/libc/stdlib/__exp10.c | |
parent | 8dabd7496a9eeaca2a7180c0a176059ba9229bb2 (diff) | |
download | gdb-43b55bace5fad27af5da7a99784667363b92c45d.tar.gz |
import newlib-2000-02-17 snapshotnewlib-2000-02-17SNAPSHOT
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; + } +} |