contrib/restricted/emscripten/system/lib/libc/musl/src/math/truncf.c


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#include "libm.h"

float truncf(float x)
{
// XXX EMSCRIPTEN: use the wasm instruction via clang builtin
// See https://github.com/emscripten-core/emscripten/issues/9236
#ifdef __wasm__
	return __builtin_truncf(x);
#else
	union {float f; uint32_t i;} u = {x};
	int e = (int)(u.i >> 23 & 0xff) - 0x7f + 9;
	uint32_t m;

	if (e >= 23 + 9)
		return x;
	if (e < 9)
		e = 1;
	m = -1U >> e;
	if ((u.i & m) == 0)
		return x;
	FORCE_EVAL(x + 0x1p120f);
	u.i &= ~m;
	return u.f;
#endif
}