[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 --- Comment #22 from joseph at codesourcery dot com --- On Mon, 2 Oct 2023, eggert at cs dot ucla.edu via Gcc-bugs wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 > > --- Comment #20 from Paul Eggert --- > (In reply to jos...@codes

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 Alexander Monakov changed: What|Removed |Added CC||amonakov at gcc dot gnu.org --- Comm

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 --- Comment #20 from Paul Eggert --- (In reply to jos...@codesourcery.com from comment #14) > This is just the same as other unspecified things like converting an > out-of-range value from floating-point to integer. No, because when GCC's consta

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 Andrew Pinski changed: What|Removed |Added CC||eggert at cs dot ucla.edu --- Comment #1

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 Roger Sayle changed: What|Removed |Added CC||joshua.england@worldprogram

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 --- Comment #17 from lucier at math dot purdue.edu --- (In reply to lucier from comment #16) > Created attachment 52026 [details] > CPU and Memorty usage reports for compilling all.i, _num.i, and compiler.i Sorry, added comment to wrong PR.

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 --- Comment #16 from lucier at math dot purdue.edu --- Created attachment 52026 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52026&action=edit CPU and Memorty usage reports for compilling all.i, _num.i, and compiler.i

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 Joel Sherrill changed: What|Removed |Added CC||joel at gcc dot gnu.org --- Com

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 --- Comment #14 from joseph at codesourcery dot com 2011-12-08 22:32:24 UTC --- On Thu, 8 Dec 2011, lucier at math dot purdue.edu wrote: > Indeed, I couldn't find a place in the gcc sources where this macro was > used: > > heine:~/programs/gcc/m

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 --- Comment #13 from lucier at math dot purdue.edu 2011-12-08 20:54:18 UTC --- On Thu, 2011-12-08 at 20:37 +, joseph at codesourcery dot com wrote: > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 > > --- Comment #12 from joseph at codesou

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 --- Comment #12 from joseph at codesourcery dot com 2011-12-08 20:37:11 UTC --- I think the soft-fp code tries to generate particular target-specific NaNs because it's also used in the Linux kernel emulation of floating-point instructions - whic

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 Jakub Jelinek changed: What|Removed |Added CC||jakub at gcc dot gnu.org --- Comment #11

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 --- Comment #10 from lucier at math dot purdue.edu 2011-12-08 18:32:56 UTC --- Near the end of section 5.3.2 of Book E: Enhanced PowerPC Architecture Version 1.0 May 7, 2002 it says Any instruction that generates a QNaN as the result of a disab

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 --- Comment #9 from lucier at math dot purdue.edu 2011-12-08 17:05:43 UTC --- Table 4.7 of the AMD64 Architecture Programmer’s Manual Volume 1: Application Programming has a footnote 3 that says 3. The floating-point indefinite value is a QNaN w

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 --- Comment #8 from Dominique d'Humieres 2011-12-08 16:06:43 UTC --- > Does IEEE say anything about the sign of the qnan? >From "Draft 1.2.5 DRAFT Standard for Floating-Point Arithmetic P754 October 4, 2006" at http://www.validlab.com/754R/draft

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 kargl at gcc dot gnu.org changed: What|Removed |Added CC||kargl at gcc dot gnu.org --- Co

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 --- Comment #6 from lucier at math dot purdue.edu 2011-12-08 14:31:23 UTC --- PS: I don't know whether IEEE says anything about the sign bit, but I doubt it. Brad

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 --- Comment #5 from lucier at math dot purdue.edu 2011-12-08 14:30:00 UTC --- Re: Do the architecture manuals say anything about the sign of the qnan? Amazingly enough, they do! I downloaded the combined x86-64 manuals from http://www.intel.com

[Bug middle-end/51446] -fno-trapping-math generates NaN constant with different sign

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51446 Richard Guenther changed: What|Removed |Added Status|UNCONFIRMED |NEW Last reconfirmed|