Sourceware Bugzilla – Attachment 5995 Details for
Bug 13304
fma, fmaf, fmal produce wrong results
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test case #5 for fma()
fma-bug5.c (text/x-csrc), 696 bytes, created by
Bruno Haible
on 2011-10-17 02:06:32 UTC
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Description:
test case #5 for fma()
Filename:
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Creator:
Bruno Haible
Created:
2011-10-17 02:06:32 UTC
Size:
696 bytes
patch
obsolete
>/* Bug in fma() of glibc 2.11.3 on x86_64. */ > >#include <math.h> >#include <stdio.h> > >int >main () >{ > volatile double x = 1.25; /* 2^0 + 2^-2 */ > volatile double y = - 0.75; /* - 2^0 + 2^-2 */ > volatile double z = ldexp (1.0, 53); /* 2^53 */ > /* x * y + z with infinite precision: 2^53 - 2^0 + 2^-4. > Lies between (2^53 - 2^0) and 2^53 and is closer to (2^53 - 2^0), > therefore the rounding must round down and produce (2^53 - 2^0). */ > volatile double expected = ldexp (1.0, 53) - 1.0; > volatile double result = fma (x, y, z); > > if (result != expected) > { > printf ("Expected: %A\n", expected); > printf ("Actual: %A\n", result); > return 1; > } > > return 0; >}
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