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From: Joel Salomon <JoelCSalomon@Gmail.com>
To: 9fans@cse.psu.edu
Subject: [9fans] NaN(2)
Date: Tue, 20 Feb 2007 18:55:31 -0500	[thread overview]
Message-ID: <9c9d07436eff1c038450ca310ea13a7a@plan9.jp> (raw)

My system doesn’t seem to like it when I call NaN(2):

cpu% cat tnan.c
#include <u.h>
#include <libc.h>

void
main(int, char**)
{
	double d = NaN();
	print("d = %f\n", d);

	exits(0);
}
cpu% 8c -FVw tnan.c
cpu% 8l tnan.8
cpu% 8.out
8.out 55798: suicide: sys: fp: invalid operation fppc=0x10a4 status=0x8081 pc=0x00001028
cpu% acid 55798
/proc/55798/text:386 plan 9 executable

/sys/lib/acid/port
/sys/lib/acid/386
acid: stk()
main()+0x8 /usr/chesky/src/hak/lex/tnan.c:7
_main+0x31 /sys/src/libc/386/main9.s:16
acid: asm(main)
main 0x00001020	SUBL	$0x1c,SP
main+0x3 0x00001023	CALL	NaN(SB)
main+0x8 0x00001028	FMOVDP	F0,d+0x14(SP)
…

Why is this happening?

Also, what is Intel’s name for the FMOVDP instruction?

--Joel



             reply	other threads:[~2007-02-20 23:55 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-20 23:55 Joel Salomon [this message]
2007-02-21  0:00 ` Joel C. Salomon
2007-02-21  0:20   ` Joel Salomon
2007-02-21  1:00     ` erik quanstrom
2007-02-21  2:26       ` Joel Salomon
2007-02-21  4:18         ` erik quanstrom
2007-02-21  4:35           ` Joel C. Salomon
2007-02-21  5:10           ` Joel C. Salomon
2007-02-21  5:50 ` Russ Cox

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