| #include "libm.h" |
| |
| float nexttowardf(float x, long double y) { |
| union { |
| float f; |
| uint32_t i; |
| } ux = {x}; |
| uint32_t e; |
| |
| if (isnan(x) || isnan(y)) |
| return x + y; |
| if (x == y) |
| return y; |
| if (x == 0) { |
| ux.i = 1; |
| if (signbit(y)) |
| ux.i |= 0x80000000; |
| } else if (x < y) { |
| if (signbit(x)) |
| ux.i--; |
| else |
| ux.i++; |
| } else { |
| if (signbit(x)) |
| ux.i++; |
| else |
| ux.i--; |
| } |
| e = ux.i & 0x7f800000; |
| /* raise overflow if ux.f is infinite and x is finite */ |
| if (e == 0x7f800000) |
| FORCE_EVAL(x + x); |
| /* raise underflow if ux.f is subnormal or zero */ |
| if (e == 0) |
| FORCE_EVAL(x * x + ux.f * ux.f); |
| return ux.f; |
| } |
