Z == Zefram zef...@fysh.org writes:
Z On amd64, powl() is generating inaccurate results when called at runtime,
Z but if a call to it gets constant-folded at compile time (by gcc 4.7)
Z then the constant-folded result is much more accurate.
AIUI, gcc uses multi-precision arith for constant
[I hit send to soon ... -JimC]
And glibc 2.17 gets the same result as gcc does.
-JimC
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James Cloos cl...@jhcloos.com OpenPGP: 1024D/ED7DAEA6
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Package: libc6
Version: 2.13-38
Severity: normal
On amd64, powl() is generating inaccurate results when called at runtime,
but if a call to it gets constant-folded at compile time (by gcc 4.7)
then the constant-folded result is much more accurate.
$ cat t0.c
#include math.h
#include stdio.h
int
On Sun, Oct 27, 2013 at 03:57:14PM +, Zefram wrote:
Version: 2.13-38
The current version of libc6 is 2.17-93.
On amd64, powl() is generating inaccurate results when called at runtime,
but if a call to it gets constant-folded at compile time (by gcc 4.7)
then the constant-folded result is
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