newlib-cygwin/winsup/mingw/mingwex/math/signbitf.c

11 lines
240 B
C

#define __FP_SIGNBIT 0x0200
int __signbitf (float x) {
unsigned short sw;
__asm__ ("fxam; fstsw %%ax;"
: "=a" (sw)
: "t" (x) );
return (sw & __FP_SIGNBIT) != 0;
}
int __attribute__ ((alias ("__signbitf"))) signbitf (float);