[Bug bootstrap/12269] New: Mainline failed to bootstrap on Linux/ia64

[Bug bootstrap/12269] New: Mainline failed to bootstrap on Linux/ia64

[hjl at lucon dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12269

           Summary: Mainline failed to bootstrap on Linux/ia64
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hjl at lucon dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: ia64-unknown-linux-gnu
  GCC host triplet: ia64-unknown-linux-gnu
GCC target triplet: ia64-unknown-linux-gnu

As of Sat Sep 13 17:04:10 UTC 2003, mainline failed to bootstrap. I
got

./xgcc -B./ -B/usr/gcc-3.4/ia64-unknown-linux-gnu/bin/ -isystem /usr/gcc-
3.4/ia64-unknown-linux-gnu/include -isystem /usr/gcc-3.4/ia64-unknown-linux-
gnu/sys-include -L/export/build/gnu/gcc/build-ia64-linux/gcc/../ld -O2  -
DIN_GCC    -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -
isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -
D__GCC_FLOAT_NOT_NEEDED  -c -o crtfastmath.o \
        /net/gnu/export/gnu/src/gcc/gcc/gcc/config/ia64/crtfastmath.c
/net/gnu/export/gnu/src/gcc/gcc/gcc/config/ia64/crtfastmath.c: In function 
`__ia64_set_fast_math':

/net/gnu/export/gnu/src/gcc/gcc/gcc/config/ia64/crtfastmath.c:37: internal 
compiler error: in find_basic_blocks_1, at cfgbuild.c:576
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
make[4]: *** [crtfastmath.o] Error 1
make[4]: *** Waiting for unfinished jobs....

The last working one is Tue Sep  9 00:38:56 UTC 2003.

[Bug bootstrap/12269] Mainline failed to bootstrap on Linux/ia64

[hjl at lucon dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12269


hjl at lucon dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |rth at gcc dot gnu dot org
                   |dot org                     |
             Status|UNCONFIRMED                 |ASSIGNED


------- Additional Comments From hjl at lucon dot org  2003-09-14 02:53 -------
Richard, I have verified that your change

http://gcc.gnu.org/ml/gcc-cvs/2003-09/msg00306.html

caused this bug. Could you please look into it? Thanks.

[Bug bootstrap/12269] Mainline failed to bootstrap on Linux/ia64

[hjl at lucon dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12269


hjl at lucon dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|rth at gcc dot gnu dot org  |unassigned at gcc dot gnu
                   |                            |dot org
             Status|ASSIGNED                    |NEW


------- Additional Comments From hjl at lucon dot org  2003-09-14 02:55 -------
Oops. I was wrong. It is not that change which caused this problem.

[Bug bootstrap/12269] Mainline failed to bootstrap on Linux/ia64

[hjl at lucon dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12269


hjl at lucon dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |sayle at gcc dot gnu dot org
                   |dot org                     |
             Status|NEW                         |ASSIGNED


------- Additional Comments From hjl at lucon dot org  2003-09-14 05:31 -------
Roger, your patch

http://gcc.gnu.org/ml/gcc-patches/2003-09/msg00706.html

caused this problem. The stage1 compiler is miscompiled by your patch.
Could you please look into it? Thanks.

[Bug bootstrap/12269] Mainline failed to bootstrap on Linux/ia64

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12269



------- Additional Comments From pinskia at gcc dot gnu dot org  2003-09-14 05:51 -------
If it is caused by the patch which you say it is, then it is most likely a sharing problem rather than 
the patch itself and by looking at the patch I really think this is a rtl sharing problem.  I wish there 
was a way to prove it was.

[Bug bootstrap/12269] Mainline failed to bootstrap on Linux/ia64

[roger at eyesopen dot com]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12269



------- Additional Comments From roger at eyesopen dot com  2003-09-15 02:42 -------
I believe a suitable testcase for the underlying failure is the miscompilation
of gcc.c-torture/execute/builtins/string-3-lib.c, which is the only regression
in the C testsuite for ia64-linux.  Indeed something is clearly going very in
combine.c which eliminates the "n < 2" comparison entirely.

[Bug bootstrap/12269] Mainline failed to bootstrap on Linux/ia64

[cvs-commit at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12269



------- Additional Comments From cvs-commit at gcc dot gnu dot org  2003-09-16 17:16 -------
Subject: Bug 12269

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	sayle@gcc.gnu.org	2003-09-16 17:16:25

Modified files:
	gcc            : ChangeLog simplify-rtx.c cfgloopanal.c 

Log message:
	PR bootstrap/12269
	* simplify-rtx.c (simplify_gen_relational): Allow the cmp_mode
	argument to be VOIDmode, taking the mode of the comparison from
	the operands.  Only call simplify_relational_operation if we
	know the mode of the comparison.  Honor FLOAT_STORE_FLAG_VALUE
	if comparison has a floating point result.  Ensure that the
	result is always of the specified mode.
	(simplify_replace_rtx): Simplify call to simplify_gen_relational.
	(simplify_unary_operation): Ensure the correct mode and cmp_mode
	are always passed to simplify_gen_relational.  Simplify NOT of
	comparison operator in any mode, not just BImode.
	(simplify_ternary_operation): Correct tests on the return value
	of simplify_relational_operation to use const_true_rtx, not
	const1_rtx.  Abort if it ever returns a non-constant result.
	
	* cfgloopanal.c (count_strange_loop_iterations): Use the function
	simplify_relational_operation, not simplify_gen_relational, if
	we're only interested in constant comparisons and will ignore
	non-constant results.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.1070&r2=2.1071
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/simplify-rtx.c.diff?cvsroot=gcc&r1=1.158&r2=1.159
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cfgloopanal.c.diff?cvsroot=gcc&r1=1.12&r2=1.13

[Bug bootstrap/12269] Mainline failed to bootstrap on Linux/ia64

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12269


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


------- Additional Comments From pinskia at gcc dot gnu dot org  2003-09-16 18:43 -------
Fixed by the patch.

[Bug bootstrap/12269] Mainline failed to bootstrap on Linux/ia64

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12269


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |3.4