1 // Wasm's `min` and `max` operators implement the IEEE 754-2019
2 // `minimum` and `maximum` operations, meaning that given a choice
3 // between NaN and a number, they return NaN. This differs from
4 // the C standard library's `fmin` and `fmax` functions, which
5 // return the number. However, we can still use wasm's builtins
6 // by handling the NaN cases explicitly, and it still turns out
7 // to be faster than doing the whole operation in
8 // target-independent C. And, it's smaller.
9
10 #include <math.h>
11
fminf(float x,float y)12 float fminf(float x, float y) {
13 if (isnan(x)) return y;
14 if (isnan(y)) return x;
15 return __builtin_wasm_min_f32(x, y);
16 }
17
fmaxf(float x,float y)18 float fmaxf(float x, float y) {
19 if (isnan(x)) return y;
20 if (isnan(y)) return x;
21 return __builtin_wasm_max_f32(x, y);
22 }
23
fmin(double x,double y)24 double fmin(double x, double y) {
25 if (isnan(x)) return y;
26 if (isnan(y)) return x;
27 return __builtin_wasm_min_f64(x, y);
28 }
29
fmax(double x,double y)30 double fmax(double x, double y) {
31 if (isnan(x)) return y;
32 if (isnan(y)) return x;
33 return __builtin_wasm_max_f64(x, y);
34 }
35