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Diffstat (limited to 'lib/powidf2.c')
-rw-r--r-- | lib/powidf2.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/lib/powidf2.c b/lib/powidf2.c new file mode 100644 index 00000000..3237e266 --- /dev/null +++ b/lib/powidf2.c @@ -0,0 +1,33 @@ +//===-- powidf2.cpp - Implement __powidf2 ---------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements __powidf2 for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#include "int_lib.h" + +// Returns: a ^ b + +double +__powidf2(double a, si_int b) +{ + const int recip = b < 0; + double r = 1; + while (1) + { + if (b & 1) + r *= a; + b /= 2; + if (b == 0) + break; + a *= a; + } + return recip ? 1/r : r; +} |