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Red Hat Bugzilla – Attachment 148769 Details for
Bug 230013
Floating point operations corrupted in user space, resulting in eg nan's
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Simple C program which illustrates fpu corruption
test2.c (text/x-csrc), 888 bytes, created by
Mark Robson
on 2007-02-25 23:02:05 UTC
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Description:
Simple C program which illustrates fpu corruption
Filename:
MIME Type:
Creator:
Mark Robson
Created:
2007-02-25 23:02:05 UTC
Size:
888 bytes
patch
obsolete
>#include <math.h> >#include <stdio.h> > >int main(){ > double prevTotal = 0.0; > double total = 0.0; > int count = 0; > int stop = 0; > double a; > for (a = 5.0; !stop && a > -5.0; a-= 0.00000001, count++){ > double theExp = 1.0 + a * 0.5 * a *a;//exp(a); > total += theExp; > if (isnan(theExp)){ > //cout << "exp(" << a << ") gives NaN" << endl; > printf("exp(%f) gives NaN\n", a); > stop = 1; > } > if (isnan(total)){ > //cout << "adding " << theExp << " to " << prevTotal << > // " gives NaN" << endl; > printf("adding %f to %f gives NaN\n", theExp,prevTotal); > stop = 1; > } > if (count == 10000000){ > printf("%f, %f\n", total, a); > count = 0; > } > prevTotal = total; > } > //cout << "Finished" << endl; > return 0; >}
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bug 230013
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