Bug#470318: i387 versus SSE versus MPFR (gcc "bug")

2009-04-17 Thread Vincent Lefevre
On 2008-04-17 14:02:17 +0400, Alexei Sheplyakov wrote: > I don't think it's a bug. Rather, it's a wrong expectation from the > user side. You are comparing results of FP calculation done on 3 > different platforms: ix87, sse2, and MPFR, and expect them to be the > same. I think your expectation is

Bug#470318: i387 versus SSE versus MPFR (gcc "bug")

2008-04-18 Thread Ondrej Certik
Hi Alexei! On Thu, Apr 17, 2008 at 12:02 PM, Alexei Sheplyakov <[EMAIL PROTECTED]> wrote: [...] > > I'd like to trace this bug down and figure out if it's a bug in gcc, or > > somewhere else. > > I don't think it's a bug. Rather, it's a wrong expectation from the user > side. > You are compar

Bug#470318: i387 versus SSE versus MPFR (gcc "bug")

2008-04-17 Thread Alexei Sheplyakov
Hello! Ondrej Certik <[EMAIL PROTECTED]> writes: > $ ./a.out > -4.1974624032366689e+117 > -8.4657370748010221e-47 > 4.9581771393902231e+163 > > and with -O: > > $ gcc -W -Wall -O quot.c > $ ./a.out > -4.1974624032366689e+117 > -8.4657370748010221e-47 > 4.9581771393902237e+163 > > produces d