| /** |
| * This file has no copyright assigned and is placed in the Public Domain. |
| * This file is part of the w64 mingw-runtime package. |
| * No warranty is given; refer to the file DISCLAIMER.PD within this package. |
| */ |
| #include <math.h> |
| #include <complex.h> |
| |
| float complex csqrtf (float complex Z) |
| { |
| float complex Res; |
| float r; |
| float x = __real__ Z; |
| float y = __imag__ Z; |
| |
| if (y == 0.0f) |
| { |
| if (x < 0.0f) |
| { |
| __real__ Res = 0.0f; |
| __imag__ Res = sqrtf (-x); |
| } |
| else |
| { |
| __real__ Res = sqrtf (x); |
| __imag__ Res = 0.0f; |
| } |
| } |
| |
| else if (x == 0.0f) |
| { |
| r = sqrtf(0.5f * fabsf (y)); |
| __real__ Res = r; |
| __imag__ Res = y > 0 ? r : -r; |
| } |
| |
| else |
| { |
| float t = sqrtf (2 * (_hypot (__real__ Z, __imag__ Z) + fabsf (x))); |
| float u = t / 2.0f; |
| if ( x > 0.0f) |
| { |
| __real__ Res = u; |
| __imag__ Res = y / t; |
| } |
| else |
| { |
| __real__ Res = fabsf (y / t); |
| __imag__ Res = y < 0 ? -u : u; |
| } |
| } |
| |
| return Res; |
| } |