Author serhiy.storchaka
Recipients davin, jeff.allen, mark.dickinson, rhettinger, serhiy.storchaka, skrah, tim.peters
Date 2017-10-29.20:58:34
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1509310714.69.0.213398074469.issue31630@psf.upfronthosting.co.za>
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Content
I have got both (!) results in the same binary on NetBSD (gcc 4.8.5).

tan(1.57079632679489611) = 1978937966095219.000000
tan(0x1.921fb54442d16p+0) = 0x1.c1f559a01adccp+50
tan(1.57079632679489611) = 1978945885716843.000000
tan(0x1.921fb54442d16p+0) = 0x1.c1f5cfa3105acp+50

Seems the first result is calculated at compile time while the second result is calculated at run time.

On OpenBSD (gcc 4.2.1):

tan(1.57079632679489611) = 1978945885716843.000000
tan(0x1.921fb54442d16p+0) = 0x1.c1f5cfa3105acp+50
tan(1.57079632679489611) = 1978945885716843.000000
tan(0x1.921fb54442d16p+0) = 0x1.c1f5cfa3105acp+50

On Linux (gcc 7.2.0) and FreeBSD (clang 4.0.0):

tan(1.57079632679489611) = 1978937966095219.000000
tan(0x1.921fb54442d16p+0) = 0x1.c1f559a01adccp+50
tan(1.57079632679489611) = 1978937966095219.000000
tan(0x1.921fb54442d16p+0) = 0x1.c1f559a01adccp+50
History
Date User Action Args
2017-10-29 20:58:34serhiy.storchakasetrecipients: + serhiy.storchaka, tim.peters, rhettinger, mark.dickinson, skrah, jeff.allen, davin
2017-10-29 20:58:34serhiy.storchakasetmessageid: <1509310714.69.0.213398074469.issue31630@psf.upfronthosting.co.za>
2017-10-29 20:58:34serhiy.storchakalinkissue31630 messages
2017-10-29 20:58:34serhiy.storchakacreate