I would like to, but as far as I know the only testcase possible is below, and as far as I know there is no possibility to use dg-error for runtime exceptions(Sorry, if I'm wrong). There are only 2 versions of the flag exception or no exception and the error is, when they are combined in CSE.
> -----Original Message----- > From: H.J. Lu [mailto:hjl.to...@gmail.com] > Sent: Monday, June 12, 2017 3:43 PM > To: Koval, Julia <julia.ko...@intel.com> > Cc: GCC Patches <gcc-patches@gcc.gnu.org>; Uros Bizjak > <ubiz...@gmail.com>; Kirill Yukhin <kirill.yuk...@gmail.com> > Subject: Re: [PATCH][X86] Fix rounding pattern similar to PR73350 > > On Mon, Jun 12, 2017 at 6:21 AM, Koval, Julia <julia.ko...@intel.com> wrote: > > This is the same issue as PR73350 and PR80862 for disabling FP exceptions. > > > > gcc -O0 -mavx512f -mavx512er returns exception > > gcc -O2 -mavx512f -mavx512er returns nan > > > > For this code: > > > > #include <stdio.h> > > #include <math.h> > > #include <x86intrin.h> > > #include <limits.h> > > #include <float.h> > > > > int main(int argc, char *argv[]) { > > __m512 a = _mm512_set1_ps((float) -1); > > __m512 b = _mm512_set1_ps((float) -1); > > _mm_setcsr( _MM_MASK_MASK &~ > > > (_MM_MASK_OVERFLOW|_MM_MASK_INVALID|_MM_MASK_DIV_ZERO) ); > > __m512 result1 = _mm512_rsqrt28_round_ps(a, _MM_FROUND_NO_EXC ); > > printf("%d %d\n", _MM_FROUND_CUR_DIRECTION, > _MM_FROUND_NO_EXC); > > __m512 result2 = _mm512_rsqrt28_round_ps(a, > _MM_FROUND_CUR_DIRECTION); > > > > printf("%g\n", result1[0] - result2[0]); > > > > return 0; > > } > > > > This patch fixes the issue. > > > > gcc/ > > * config/i386/i386.c: Fix rounding expand for new pattern > > * config/i386/subst.md: Fix pattern (parallel -> unspec) > > > > Ok for trunk? > > > > Please include the testcase. > > Thanks. > > -- > H.J.
