Date: Sun, 11 Aug 2002 22:27:01 +0100 From: David Malone <dwmalone@maths.tcd.ie> To: Dan Lukes <dan@obluda.cz> Cc: freebsd-bugs@FreeBSD.org, bde@FreeBSD.org Subject: Re: bin/40209: __dtoa broken with -O2 or -O3 optimisation Message-ID: <20020811212701.GA95745@walton.maths.tcd.ie> In-Reply-To: <200207150140.g6F1e4SI056496@freefall.freebsd.org> References: <200207150140.g6F1e4SI056496@freefall.freebsd.org>
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On Sun, Jul 14, 2002 at 06:40:04PM -0700, Dan Lukes wrote:
> 226: #define word0(x) ((ULong *)&x)[1]
> 227: #define word1(x) ((ULong *)&x)[0]
I guess that changing x by accessing word0 or word1 is a violation
of the aliasing rules. The deinitions might work:
union doubleasulongs {
double x;
ULong w[2];
};
#define word0(x) (((union doubleasulongs *)&x)->w)[1]
#define word1(x) (((union doubleasulongs *)&x)->w)[0]
Could you test them and see?
David.
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