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Red Hat Bugzilla – Attachment 520039 Details for
Bug 733372
three-dotted range using floats doesn't work properly on i386
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C reproducer
doublerange.c (text/plain), 753 bytes, created by
Vít Ondruch
on 2011-08-26 09:10:01 UTC
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Description:
C reproducer
Filename:
MIME Type:
Creator:
Vít Ondruch
Created:
2011-08-26 09:10:01 UTC
Size:
753 bytes
patch
obsolete
>#include <float.h> >#include <math.h> >#include <stdio.h> > >void main() >{ > const double epsilon = DBL_EPSILON; > double beg = 1.0; > double end = 9.4; > double unit = 1.2; > double n = (end - beg)/unit; > double err = (fabs(beg) + fabs(end) + fabs(end-beg)) / fabs(unit) * epsilon; > long i; > > printf("epsilon: %.50f\n", epsilon); > printf("begin: %.50f\n", beg); > printf("end: %.50f\n", end); > printf("unit: %.50f\n", unit); > printf("n: %.50f\n", n); > printf("err: %.50f\n", err); > > if (err>0.5) err=0.5; > n = floor(n + err); > > printf("floor n: %.50f\n", n); > printf("long n: %.50f\n", ((long)n)*unit+beg); > > if (((long)n)*unit+beg < end) n++; > > printf("corrected n: %.50f\n", n); > printf("\n", n); > > for (i=0; i<n; i++) { > printf("%.50f\n", i*unit+beg); > } >}
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