Re: gcc -O broken in CURRENT

[ozan s. yigit]

in a related tangential note, i recently found (out of sheer irritation)
in less than an hour that several (including the latest) versions of GCC
 -O and -O2 failed the paranoia test in different ways, to wit:

gcc -o paranoia paranoia.c

[paranoia output elided]

The number of  DEFECTs  discovered = 1.
The number of  FLAWs  discovered =   1.

gcc -O2 -o paranoia paranoia.c

[paranoia output elided]

The number of  FAILUREs  encountered =   4.
The number of  SERIOUS DEFECTs  discovered = 4.
The number of  DEFECTs  discovered = 2.
The number of  FLAWs  discovered =   2.

i assume everyone knows about kahan and paranoia. if not see netlib.

oz
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Re: gcc -O broken in CURRENT

[ozan s. yigit]

 Add the -ffloat-store flag to your compilation flags (or
 add -msoft-float).

that really means for this compiler on certain platforms, you
can have slow and correct or fast and incorrect, but NOT fast
and correct.

oz
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float [was Re: gcc -O broken in CURRENT]

[ozan s. yigit]

 If you really want to investigate FreeBSD FP/math capabilities
 search for UCBTEST or visit
 www.cs.berkeley.edu/~jhauser/arithmetic/TestFloat.html 

cool! thanks for the pointer.

oz
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