Date: Mon, 23 Sep 2002 13:40:05 -0700 (PDT) From: Mikhail Teterin <mi+mx@aldan.algebra.com> To: freebsd-bugs@FreeBSD.org Subject: Re: bin/43299: march=pentium4 miscompiles msun/src/e_pow.c Message-ID: <200209232040.g8NKe5Tu010784@freefall.freebsd.org>
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The following reply was made to PR bin/43299; it has been noted by GNATS.
From: Mikhail Teterin <mi+mx@aldan.algebra.com>
To: FreeBSD-gnats-submit@FreeBSD.org, kan@FreeBSD.org
Cc: "David E. O'Brien" <obrien@FreeBSD.org>
Subject: Re: bin/43299: march=pentium4 miscompiles msun/src/e_pow.c
Date: Mon, 23 Sep 2002 16:32:17 -0400
This has something to do with how the function's parameters are being
passed in the SSE2 case. In the debugger, when entering the function,
its second argument is already corrupted:
(gdb) s
main () at t.c:9
9 printf("%g^%g is %g\n", 2.0, 2.1, __ieee754_pow(2.0, 2.1));
(gdb) s
__ieee754_pow (x=2.1000000000000001, y=-nan(0x8000000000000)) at e_pow.c:107
107 EXTRACT_WORDS(hx,lx,x);
Hope, this helps,
-mi
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