Re: inline-asm/10123: inconsistent operand constraints cause ICE at -O0

Re: inline-asm/10123: inconsistent operand constraints cause ICE at -O0

[Jonah Graham]

The following reply was made to PR inline-asm/10123; it has been noted by GNATS.

From: "Jonah Graham" <gccmail@whalesolutions.ca>
To: <gccmail@whalesolutions.ca>, <gcc-gnats@gcc.gnu.org>,
   <gcc-bugs@gcc.gnu.org>, <nobody@gcc.gnu.org>, <gcc-prs@gcc.gnu.org>
Cc:  
Subject: Re: inline-asm/10123: inconsistent operand constraints cause ICE at -O0
Date: Mon, 17 Mar 2003 21:02:42 -0000

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&p
 r=10123
 
 Earlier I filed the above bug report, but now I think that 10012 and 9910
 are still the same issue. All three of them try assigning to the 'e'
 constraint, which is a constant type extra constraint on x86.
 
 Perhaps two of the three can be closed. Probably mine (10123) and 10012 as
 there is much less information in them.
 
 
 
 
 
 

Re: inline-asm/10123: inconsistent operand constraints cause ICE at -O0

[bangerth]

Synopsis: inconsistent operand constraints cause ICE at -O0

State-Changed-From-To: open->closed
State-Changed-By: bangerth
State-Changed-When: Tue Mar 18 00:35:27 2003
State-Changed-Why:
    On request of submitter

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10123

inline-asm/10123: inconsistent operand constraints cause ICE at -O0

[gccmail]

>Number:         10123
>Category:       inline-asm
>Synopsis:       inconsistent operand constraints cause ICE at -O0
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          ice-on-illegal-code
>Submitter-Id:   net
>Arrival-Date:   Mon Mar 17 14:56:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Jonah Graham
>Release:        gcc version 3.3 20030303 (prerelease)
>Organization:
>Environment:
i686-pc-cygwin
>Description:
When a register constraint that is an EXTRA_CONSTRAINT for the machine and the extra constraint only accepts a constant, an ICE occurs in instantiate_virtual_regs_1, at function.c:4087, but only when compiled with -O0. An example is 'e' on x86. (This run is from 3.3, but it also occurs in 3.1.) 

int main(int argc, char **argv)
{
        asm volatile ("" : "=e" (argc) : );
        return 0;
}

$ ./xgcc -B. -v
Reading specs from ./specs
Configured with: /cygdrive/q/csp/taz/gcc-20030303/configure --enable-languages=c
Thread model: single
gcc version 3.3 20030303 (prerelease)

>How-To-Repeat:
$ cat extra_constraint.c
int main(int argc, char **argv)
{
        asm volatile ("" : "=e" (argc) : );
        return 0;
}

$ cat immed_constraint.c
int main(int argc, char **argv)
{
        asm volatile ("" : "=I" (argc) : );
        return 0;
}

$ ./xgcc -B. -O0 extra_constraint.c
extra_constraint.c: In function `main':
extra_constraint.c:5: internal compiler error: in instantiate_virtual_regs_1, at function.c:4087
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

$ ./xgcc -B. -O1 extra_constraint.c
extra_constraint.c: In function `main':
extra_constraint.c:3: error: inconsistent operand constraints in an `asm'

$ ./xgcc -B. -O0 immed_constraint.c
immed_constraint.c: In function `main':
immed_constraint.c:3: error: inconsistent operand constraints in an `asm'
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: