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