https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88240
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Thomas De Schampheleire from comment #0) > gcc 7.3.0 optimizes below code in a way that may cause a floating-point > underflow (SIGFPE with underflow flag) on x86. The underflow occurs on an > 'fldl' instruction. FLD will generate _denormal_ (#DE) exception for denormal single and double FP operand ([1], 8.5.2). This is a non-standard exception, and has to be distinguished from numeric underflow exception (#UE). Is there a reason for denormal exception to be unmasked? [1] http://home.agh.edu.pl/~amrozek/x87.pdf
