>Number: 10277 >Category: libstdc++ >Synopsis: Asymptotic of 'exp(x)' for small 'float x'. >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Mon Mar 31 13:36:00 UTC 2003 >Closed-Date: >Last-Modified: >Originator: g. k. voykov >Release: GCC 3.2.2 from DJGPP zip files >Organization: >Environment: Intel Pentium III, Windows 98, Compaq Deskpro >Description: Differences between GCC 3.0.2 and GCC 3.2.2 behaviour calculating 'exp(x)' for small 'float x'. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: application/octet-stream; name="gcc322.cxx" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="gcc322.cxx" DQojaWYgMA0KQGVjaG8gR0NDIDMuMi4yIGNvbXBpbGF0aW9uIC4uLg0KQGVjaG8gb2ZmDQpnY2Mg LWMgJTEuY3h4IC1wZWRhbnRpYy1lcnJvcnMgLVdhbGwNCmlmIGVycm9ybGV2ZWwgMSBnb3RvIGVu ZA0KQGVjaG8gICAgICAgICAgICAgIGxpbmtlZGl0IC4uLg0KZ3h4IC1vICUxICUxLm8gLWxtDQpp ZiBlcnJvcmxldmVsIDEgZ290byBlbmQNCmRlbCAlMS5vDQpkZWwgJTENCkBlY2hvICAgICAgICAg ICAgIGV4ZWN1dGlvbiAuLi4NCiUxLmV4ZQ0KOmVuZA0KI2VuZGlmDQoNCi8vIFRlc3RpbmcgJ2V4 cCh4KScgZm9yIHNtYWxsIHZhbHVlcyBvZiAneCcNCg0KI2luY2x1ZGUgPGlvc3RyZWFtPg0KI2lu Y2x1ZGUgPGlvbWFuaXA+DQojaW5jbHVkZSA8Y21hdGg+DQp1c2luZyBuYW1lc3BhY2Ugc3RkOw0K DQppbnQgbWFpbigpDQp7DQogICAgLy8gT0sgIQ0KICAgIGNvdXQgPDwgIlxuIHNtYWxsIGFyZ3Vt ZW50LCBwb3NpdGl2ZSwgZG91YmxlXG4iOw0KICAgIGRvdWJsZSBkID0gMS4yNWUtMTY7DQogICAg Zm9yIChpbnQgaSA9IDE7IGkgPCAzOyBpKyspIHsNCiAgICAgICAgY291dCA8PCBzY2llbnRpZmlj IDw8IHNldHByZWNpc2lvbigyKQ0KICAgICAgICAgICAgIDw8IHNldHcoMTUpIDw8IGQNCiAgICAg ICAgICAgICA8PCBzZXR3KDIwKSA8PCAxLjAgLSBleHAoZCkgPDwgJ1xuJzsNCiAgICAgICAgZCAv PSAyOw0KICAgIH0NCiAgICBjb3V0IDw8ICIgc21hbGwgYXJndW1lbnQsIG5lZ2F0aXZlLCBkb3Vi bGVcbiI7DQogICAgZCA9IC0xLjAwZS0xNjsNCiAgICBmb3IgKGludCBpID0gMTsgaSA8IDM7IGkr Kykgew0KICAgICAgICBjb3V0IDw8IHNldHcoMTUpIDw8IGQNCiAgICAgICAgICAgICA8PCBzZXR3 KDIwKSA8PCAxLjAgLSBleHAoZCkgPDwgJ1xuJzsNCiAgICAgICAgZCAvPSAyOw0KICAgIH0NCiAg ICBjaW4uZ2V0KCk7DQoNCiAgICAvLyBXQVJOSU5HICENCiAgICBjb3V0IDw8ICJcbiBzbWFsbCBh cmd1bWVudCwgcG9zaXRpdmUsIGZsb2F0XG4iOw0KICAgIGZsb2F0IGYgPSA1LjY4ZS0yMDsNCiAg ICAvL2Zsb2F0IGYgPSA2LjI1ZS04OyAgLy8gR0NDIDMuMC4yDQogICAgZm9yIChpbnQgaSA9IDE7 IGkgPCAzOyBpKyspIHsNCiAgICAgICAgY291dCA8PCBzZXR3KDE1KSA8PCBmDQogICAgICAgICAg ICAgPDwgc2V0dygyMCkgPDwgMS4wIC0gZXhwKGYpIDw8ICdcbic7DQogICAgICAgIGYgLz0gMjsN CiAgICB9DQogICAgY291dCA8PCAiIHNtYWxsIGFyZ3VtZW50LCBuZWdhdGl2ZSwgZmxvYXRcbiI7 DQogICAgZiA9IC0yLjg0ZS0yMDsNCiAgICAvL2YgPSAtNS4wMGUtODsgICAgICAgLy8gR0NDIDMu MC4yDQogICAgZm9yIChpbnQgaSA9IDE7IGkgPCAzOyBpKyspIHsNCiAgICAgICAgY291dCA8PCBz ZXR3KDE1KSA8PCBmDQogICAgICAgICAgICAgPDwgc2V0dygyMCkgPDwgMS4wIC0gZXhwKGYpIDw8 ICdcbic7DQogICAgICAgIGYgLz0gMjsNCiAgICB9DQp9DQoNCiNpZiAwDQogc21hbGwgYXJndW1l bnQsIHBvc2l0aXZlLCBkb3VibGUNCiAgICAgICAxLjI1ZS0xNiAgICAgICAgICAgLTIuMjJlLTE2 DQogICAgICAgNi4yNWUtMTcgICAgICAgICAgICAwLjAwZSswMA0KIHNtYWxsIGFyZ3VtZW50LCBu ZWdhdGl2ZSwgZG91YmxlDQogICAgICAtMS4wMGUtMTYgICAgICAgICAgICAxLjExZS0xNg0KICAg ICAgLTUuMDBlLTE3ICAgICAgICAgICAgMC4wMGUrMDANCg0KIHNtYWxsIGFyZ3VtZW50LCBwb3Np dGl2ZSwgZmxvYXQNCiAgICAgICA1LjY4ZS0yMCAgICAgICAgICAgLTEuMDhlLTE5DQogICAgICAg Mi44NGUtMjAgICAgICAgICAgICAwLjAwZSswMA0KIHNtYWxsIGFyZ3VtZW50LCBuZWdhdGl2ZSwg ZmxvYXQNCiAgICAgIC0yLjg0ZS0yMCAgICAgICAgICAgIDUuNDJlLTIwDQogICAgICAtMS40MmUt MjAgICAgICAgICAgICAwLjAwZSswMA0KI2VuZGlmDQo=
Synopsis: Asymptotic of 'exp(x)' for small 'float x'. Responsible-Changed-From-To: unassigned->gdr Responsible-Changed-By: bkoz Responsible-Changed-When: Mon Apr 28 17:21:32 2003 Responsible-Changed-Why: Hey Gaby, can you take a look at this? If it's related to using builtins, can you switch it to Roger Sayle? thanks, benjamin http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10277
The following reply was made to PR libstdc++/10277; it has been noted by GNATS. From: Gabriel Dos Reis <gdr@integrable-solutions.net> To: bkoz@gcc.gnu.org Cc: gcc-bugs@gcc.gnu.org, voykov@casaccia.enea.it, gcc-gnats@gcc.gnu.org Subject: Re: libstdc++/10277: Asymptotic of 'exp(x)' for small 'float x'. Date: 29 Apr 2003 13:31:59 +0200 bkoz@gcc.gnu.org writes: | Synopsis: Asymptotic of 'exp(x)' for small 'float x'. | | Responsible-Changed-From-To: unassigned->gdr | Responsible-Changed-By: bkoz | Responsible-Changed-When: Mon Apr 28 17:21:32 2003 | Responsible-Changed-Why: | | Hey Gaby, can you take a look at this? If it's related to using | builtins, can you switch it to Roger Sayle? Yep, thanks. -- Gaby
Synopsis: Asymptotic of 'exp(x)' for small 'float x'. State-Changed-From-To: open->feedback State-Changed-By: gdr State-Changed-When: Tue May 20 01:52:31 2003 State-Changed-Why: Analyzed. http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10277
The following reply was made to PR libstdc++/10277; it has been noted by GNATS. From: Gabriel Dos Reis <gdr@acm.org> To: gcc-prs@gcc.gnu.org, voykov@casaccia.enea.it, gdr@gcc.gnu.org, gcc-bugs@gcc.gnu.org, gcc-gnats@gcc.gnu.org Cc: Subject: Re: libstdc++/10277: Asymptotic of 'exp(x)' for small 'float x'. Date: Tue, 20 May 2003 03:50:58 +0200 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10277 The result I got from your testcase is OK. What do you think is wrong? -- Gaby