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Diffstat (limited to 'compiler-rt/lib/builtins/divxc3.c')
| -rw-r--r-- | compiler-rt/lib/builtins/divxc3.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/divxc3.c b/compiler-rt/lib/builtins/divxc3.c new file mode 100644 index 00000000000..5f240e956d8 --- /dev/null +++ b/compiler-rt/lib/builtins/divxc3.c @@ -0,0 +1,63 @@ +/* ===-- divxc3.c - Implement __divxc3 -------------------------------------=== + * + * The LLVM Compiler Infrastructure + * + * This file is dual licensed under the MIT and the University of Illinois Open + * Source Licenses. See LICENSE.TXT for details. + * + * ===----------------------------------------------------------------------=== + * + * This file implements __divxc3 for the compiler_rt library. + * + */ + +#if !_ARCH_PPC + +#include "int_lib.h" +#include "int_math.h" + +/* Returns: the quotient of (a + ib) / (c + id) */ + +long double _Complex +__divxc3(long double __a, long double __b, long double __c, long double __d) +{ + int __ilogbw = 0; + long double __logbw = crt_logbl(crt_fmaxl(crt_fabsl(__c), crt_fabsl(__d))); + if (crt_isfinite(__logbw)) + { + __ilogbw = (int)__logbw; + __c = crt_scalbnl(__c, -__ilogbw); + __d = crt_scalbnl(__d, -__ilogbw); + } + long double __denom = __c * __c + __d * __d; + long double _Complex z; + __real__ z = crt_scalbnl((__a * __c + __b * __d) / __denom, -__ilogbw); + __imag__ z = crt_scalbnl((__b * __c - __a * __d) / __denom, -__ilogbw); + if (crt_isnan(__real__ z) && crt_isnan(__imag__ z)) + { + if ((__denom == 0) && (!crt_isnan(__a) || !crt_isnan(__b))) + { + __real__ z = crt_copysignl(CRT_INFINITY, __c) * __a; + __imag__ z = crt_copysignl(CRT_INFINITY, __c) * __b; + } + else if ((crt_isinf(__a) || crt_isinf(__b)) && + crt_isfinite(__c) && crt_isfinite(__d)) + { + __a = crt_copysignl(crt_isinf(__a) ? 1 : 0, __a); + __b = crt_copysignl(crt_isinf(__b) ? 1 : 0, __b); + __real__ z = CRT_INFINITY * (__a * __c + __b * __d); + __imag__ z = CRT_INFINITY * (__b * __c - __a * __d); + } + else if (crt_isinf(__logbw) && __logbw > 0 && + crt_isfinite(__a) && crt_isfinite(__b)) + { + __c = crt_copysignl(crt_isinf(__c) ? 1 : 0, __c); + __d = crt_copysignl(crt_isinf(__d) ? 1 : 0, __d); + __real__ z = 0 * (__a * __c + __b * __d); + __imag__ z = 0 * (__b * __c - __a * __d); + } + } + return z; +} + +#endif |
