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@wingo @barubary OK, here's a do-everything-via-memcpy display of the same gcc bug (again gcc -O1 -m32, after including string.h, stdio.h, math.h): void foo(void *x) { int i; if (isnan(*(float *) x)) memcpy(&i,x,4); printf("%x\n",i); }
void bar(void *x) { int i; memcpy(&i,x,4); printf("%x\n",i); }
int main() { float x = __builtin_nansf(""); foo(&x); bar(&x); return 0; }