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Diffstat (limited to 'lib/powixf2.c')
-rw-r--r-- | lib/powixf2.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/lib/powixf2.c b/lib/powixf2.c new file mode 100644 index 000000000..07e145a44 --- /dev/null +++ b/lib/powixf2.c @@ -0,0 +1,37 @@ +//===-- powixf2.cpp - Implement __powixf2 ---------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements __powixf2 for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#if !_ARCH_PPC + +#include "int_lib.h" + +// Returns: a ^ b + +long double +__powixf2(long double a, si_int b) +{ + const int recip = b < 0; + long double r = 1; + while (1) + { + if (b & 1) + r *= a; + b /= 2; + if (b == 0) + break; + a *= a; + } + return recip ? 1/r : r; +} + +#endif |