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Date: Fri, 30 Jan 2004 04:07:00 -0000
From: "lucier at math dot purdue dot edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20040130040702.13926.lucier@math.purdue.edu>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug target/13926] New: GCC generates jumps that are too large to fit in word displacement field
X-Bugzilla-Reason: CC
X-SW-Source: 2004-01/txt/msg03826.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

This is reported against 3.3.1 since that's what I have readily available now,
but I believe it also occurs in 3.4 and mainline.

With the following file:

http://www.math.purdue.edu/~lucier/bugzilla/5/_meroon.i.gz

while trying to instrument it using gcov, I get the following error:

banach-2% gcc -I/export/mdd0/users/lucier/local/gambit/include -m64 -fPIC -O0 -f
no-math-errno -fno-trapping-math -mtune=ultrasparc -c -D___DYNAMIC -D___SINGLE_H
OST -D___OPTIMIZE_SPACE -ftest-coverage -fprofile-arcs -save-temps _meroon.c
/usr/ccs/bin/as: "_meroon.s", line 450662: error: word displacement will not fit
in 19 bits
/usr/ccs/bin/as: "_meroon.s", line 35282: error: word displacement will not fit
in 19 bits
/usr/ccs/bin/as: "_meroon.s", line 35341: error: word displacement will not fit
in 19 bits
/usr/ccs/bin/as: "_meroon.s", line 35391: error: word displacement will not fit
in 19 bits
/usr/ccs/bin/as: "_meroon.s", line 35416: error: word displacement will not fit
in 19 bits
/usr/ccs/bin/as: "_meroon.s", line 35466: error: word displacement will not fit
in 19 bits
<repeated a few thousand times>

Basically, gcc on sparc64 generates predicated jumps over 2MB instead of using
an indirect jump.

(Perhaps this is the largest function ever occuring in a bugzilla report ;-)

Brad

-- 
           Summary: GCC generates jumps that are too large to fit in word
                    displacement field
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: lucier at math dot purdue dot edu
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: sparc-sun-solaris2.8
  GCC host triplet: sparc-sun-solaris2.8
GCC target triplet: sparc-sun-solaris2.8


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13926