Date: Tue, 2 Apr 2002 10:14:52 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: rittle@labs.mot.com Cc: freebsd-alpha@FreeBSD.ORG Subject: Re: alpha/36327: trap within cvt() while attempting to printf() an FP number Message-ID: <15529.51948.89157.959573@grasshopper.cs.duke.edu> In-Reply-To: <15529.48345.376711.770341@grasshopper.cs.duke.edu> References: <200203260906.g2Q962l84742@freefall.freebsd.org> <15520.33765.216885.639741@grasshopper.cs.duke.edu> <200204020813.g328DLq66977@latour.rsch.comm.mot.com> <15529.48345.376711.770341@grasshopper.cs.duke.edu>
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Andrew Gallatin writes:
>
> Loren James Rittle writes:
> >
> > In any event, it is not the code for d/10 that traps. It is code
> > inside cvt() which is called from vfprintf(). Two issues: Should a
> > library routine ever internally trap; no matter what the mask setting?
> > Shouldn't there be some way to disable the trap?
>
> There is currently no way to disable the trap for routines which are
> not compiled with -mieee. The library is not compiled with -mieee, so
> even if you don't get the trap in your code, you may get the trap in a
> library. (I compile my libm with -mieee so that Konqueror doesn't crash with
> FPE's on poorly written javascript code, its worth the slowdown. Patch appended.)
Do'h! Here's that patch..
Drew
Index: Makefile
===================================================================
RCS file: /home/ncvs/src/lib/msun/Makefile,v
retrieving revision 1.23.2.2
diff -u -r1.23.2.2 Makefile
--- Makefile 17 Dec 2001 10:09:20 -0000 1.23.2.2
+++ Makefile 29 Mar 2002 15:06:16 -0000
@@ -45,11 +45,7 @@
.PATH: ${.CURDIR)/alpha
ARCH= alpha
ARCH_SRCS = s_copysign.S s_copysignf.S
-# XXX Comment from NetBSD/Alpha:
-# XXX LINT SIGFPEs in e_exp.c's strtod(). FP underflow/denorm software
-# handling is broken (doesn't exist!) on the Alpha port.
-# Stock gcc 2.7.2.1 doesn't understand these options.
-#CFLAGS += -mtrap-precision=i -mfp-trap-mode=su
+CFLAGS += -mieee
.elif ${MACHINE_ARCH} == "i386"
ARCH= i387
ARCH_PREFIX= ${ARCH}_
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