Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/gcc.dg/torture/float128-exact-underflow.c @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
---|---|
date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
children |
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/* Test that exact underflow in __float128 signals the underflow exception if trapping is enabled, but does not raise the flag otherwise. */ /* { dg-do run { target i?86-*-*gnu* x86_64-*-*gnu* ia64-*-*gnu* } } */ /* { dg-options "-D_GNU_SOURCE" } */ /* { dg-require-effective-target fenv_exceptions } */ #include <fenv.h> #include <setjmp.h> #include <signal.h> #include <stdlib.h> volatile sig_atomic_t caught_sigfpe; sigjmp_buf buf; static void handle_sigfpe (int sig) { caught_sigfpe = 1; siglongjmp (buf, 1); } int main (void) { volatile __float128 a = 0x1p-16382q, b = 0x1p-2q; volatile __float128 r; r = a * b; if (fetestexcept (FE_UNDERFLOW)) abort (); if (r != 0x1p-16384q) abort (); feenableexcept (FE_UNDERFLOW); signal (SIGFPE, handle_sigfpe); if (sigsetjmp (buf, 1) == 0) r = a * b; if (!caught_sigfpe) abort (); exit (0); }