Mail Archives: djgpp/2000/03/25/13:45:23
From: | buers AT gmx DOT de (Dieter Buerssner)
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Newsgroups: | comp.os.msdos.djgpp
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Subject: | Gdb and floating point
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Date: | 25 Mar 2000 15:01:41 GMT
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Lines: | 32
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Message-ID: | <8bikck$54qp1$1@fu-berlin.de>
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To: | djgpp AT delorie DOT com
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DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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Reply-To: | djgpp AT delorie DOT com
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Is there a possibility to print floating point values, that are
currently in a floating point register, by the name of the variable?
(info all-register shows the values, but it can be very tedious
to find out which register corresponds to which name.)
To give an example, I compiled the following program:
#include <stdio.h>
double one = 1.0;
int main(void)
{
double d;
d = 2.0*one;
printf("%f\n", d);
return 0;
}
with gcc -g -O test.c (or -gstabs+ instead of -g).
When I set a breakpoint to the printf line and type
"p d"
after the breakpoint is hit, gdb (4.18) replies with
$1 = 1.4128210791984452e-303
which is obviously wrong. ("p one" works as expected)
-- Dieter
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