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[Bug libc/13958] New: printf(3) format spec "%La" generates odd output (at least on x86)
- From: "cloos at jhcloos dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Fri, 06 Apr 2012 19:49:27 +0000
- Subject: [Bug libc/13958] New: printf(3) format spec "%La" generates odd output (at least on x86)
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=13958
Bug #: 13958
Summary: printf(3) format spec "%La" generates odd output (at
least on x86)
Product: glibc
Version: 2.14
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: unassigned@sourceware.org
ReportedBy: cloos@jhcloos.com
CC: drepper.fsp@gmail.com
Classification: Unclassified
Some examples:
double: 1 (0x1p+0)
long double: 1 (0x8p-3)
double: 1.5 (0x1.8p+0)
long double: 1.5 (0xcp-3)
I presume this is related to the 80-bit representationâs lack of an implied
bit?
I noticed this while looking at bug #13940; this is based on Andreasâ code in
comment #1 there:
#include <stdlib.h>
#include <stdio.h>
int
main (int c, char *v[])
{
float f;
double d;
long double ld;
ld = -1.0L;
if (c > 1)
ld = strtold (v[1], NULL);
f = (float)ld;
d = (double)ld;
printf ("float %.8g (%a)\n", f,f);
printf ("double %.16g (%a)\n", d,d);
printf ("long double %.20Lg (%La)\n", ld, ld);
return 0;
}
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