Date: Tue, 13 Jul 1999 09:10:03 -0700 (PDT) From: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp> To: freebsd-alpha@freebsd.org Subject: Re: alpha/12623: strtod(3) FPE on alphaev56 Message-ID: <199907131610.JAA95315@freefall.freebsd.org>
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The following reply was made to PR alpha/12623; it has been noted by GNATS.
From: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp>
To: m.seaman@inpharmatica.co.uk
Cc: FreeBSD-gnats-submit@FreeBSD.ORG, freebsd-alpha@freebsd.org
Subject: Re: alpha/12623: strtod(3) FPE on alphaev56
Date: Wed, 14 Jul 1999 01:06:37 +0900
At Tue, 13 Jul 1999 12:27:40 +0100 (BST),
m.seaman@inpharmatica.co.uk wrote:
> >Description:
>
> Attempting to convert the string "2.49521e-297" into a double
> precision value via strtod(3) results in a floating point exception on
> the alphaev56 CPU. The problem doesn't occur on i586.
/usr/src/lib/libc/stdlib/strtod.c seems broken on alpha in three ways.
1) IEEE_8087 should be defined instead of IEEE_MC68k.
2) It assumes long is 32bit, but long is 64bit on alpha.
s/unsigned long/u_int32_t/, s/long/int32_t/.
3) It generates denormal numbers which can not be treaded by the hardware
on alpha. It should be compiled with the option
`-mtrap-precision=i -mfp-trap-mode=su' to enable software completion.
--
/\ Hidetoshi Shimokawa
\/ simokawa@sat.t.u-tokyo.ac.jp
PGP public key: finger -l simokawa@sat.t.u-tokyo.ac.jp
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