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Red Hat Bugzilla – Attachment 160796 Details for
Bug 251096
Difference in behaviour with compiler-optimised code (-O2)
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bug.c to reproduce the problem
bug.c (text/x-csrc), 497 bytes, created by
David Campbell
on 2007-08-07 03:56:14 UTC
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Description:
bug.c to reproduce the problem
Filename:
MIME Type:
Creator:
David Campbell
Created:
2007-08-07 03:56:14 UTC
Size:
497 bytes
patch
obsolete
>#include <stdio.h> >#include <stdlib.h> > >int main() >{ > int val, new_val; > double d; > unsigned char *c = (unsigned char *)&d; > if(sizeof(d) != 8) { > fprintf(stderr, "Wrong architecture\n"); > exit(1); > } > c[0] = 102; > c[1] = 102; > c[2] = 102; > c[3] = 38; > c[4] = 21; > c[5] = 197; > c[6] = 77; > c[7] = 64; > > printf("stage 1: d = %lf\n", d); > d *= 10.0; > /*printf("stage 2: d = %lf\n", d);*/ > d = d * (1 << 16); > /*printf("stage 3: d = %lf\n", d);*/ > val = (int)d; > printf("%d\n", val); > exit(0); >}
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bug 251096
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