Date: Thu, 26 Mar 1998 05:33:39 -0800 From: John Polstra <jdp@polstra.com> To: bde@zeta.org.au Cc: current@FreeBSD.ORG Subject: Re: gcc bug in -current!!! Message-ID: <199803261333.FAA19528@austin.polstra.com> In-Reply-To: <199803250712.SAA28158@godzilla.zeta.org.au> References: <199803250712.SAA28158@godzilla.zeta.org.au>
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In article <199803250712.SAA28158@godzilla.zeta.org.au>,
Bruce Evans <bde@zeta.org.au> wrote:
> >I confirm this bug present. To narrow down search path, even cc from Mar 6
> >works fine. Here is diff from assembler code generated by old and new cc
> >(without optimization), old first: as we see, main change is that "fildq"
> >replaced with "fildll".
>
> gas doesn't understand fildll (it silently (:-() converts it to fildl).
This patch to "as" fixes the test case, and I think it's correct.
This is not to say that the compiler shouldn't be fixed. But the
assembler should be fixed too, and that's easier. :-)
I haven't done a make world with this, or any large-scale testing at
all. (My -current system is in a bit of a mess at the moment.) Does
anybody see a problem with it?
Index: i386.h
===================================================================
RCS file: /home/ncvs/src/gnu/usr.bin/as/opcode/i386.h,v
retrieving revision 1.8
diff -u -r1.8 i386.h
--- i386.h 1997/07/15 07:56:53 1.8
+++ i386.h 1998/03/26 13:15:44
@@ -472,6 +472,7 @@
{"fldl", 1, 0xdd, 0, Modrm, Mem, 0, 0}, /* %st0 <-- mem double */
{"fldl", 1, 0xd9c0, _, ShortForm, FloatReg, 0, 0}, /* register */
{"filds", 1, 0xdf, 0, Modrm, Mem, 0, 0}, /* %st0 <-- mem dword */
+{"fildll", 1, 0xdf, 5, Modrm, Mem, 0, 0}, /* %st0 <-- mem qword */
{"fildq", 1, 0xdf, 5, Modrm, Mem, 0, 0}, /* %st0 <-- mem qword */
{"fldt", 1, 0xdb, 5, Modrm, Mem, 0, 0}, /* %st0 <-- mem efloat */
{"fbld", 1, 0xdf, 4, Modrm, Mem, 0, 0}, /* %st0 <-- mem bcd */
@@ -491,6 +492,7 @@
{"fstpl", 1, 0xdd, 3, Modrm, Mem, 0, 0}, /* %st0 --> mem double */
{"fstpl", 1, 0xddd8, _, ShortForm, FloatReg, 0, 0}, /* register */
{"fistps", 1, 0xdf, 3, Modrm, Mem, 0, 0}, /* %st0 --> mem dword */
+{"fistpll", 1, 0xdf, 7, Modrm, Mem, 0, 0}, /* %st0 --> mem qword */
{"fistpq", 1, 0xdf, 7, Modrm, Mem, 0, 0}, /* %st0 --> mem qword */
{"fstpt", 1, 0xdb, 7, Modrm, Mem, 0, 0}, /* %st0 --> mem efloat */
{"fbstp", 1, 0xdf, 6, Modrm, Mem, 0, 0}, /* %st0 --> mem bcd */
John
--
John Polstra jdp@polstra.com
John D. Polstra & Co., Inc. Seattle, Washington USA
"Self-knowledge is always bad news." -- John Barth
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