[Bug inline-asm/30413] New: %z produces ICE for char operands

[Bug inline-asm/30413] New: %z produces ICE for char operands

[cnovikov at pacbell dot net]

Shell log:

$ cat t14.c
int main() {
        char a,b;
        asm volatile ("mov%z0 %1, %0" : "=r"(a) : "m"(b));
}
$ gcc -o t14 t14.c
t14.c: In function `main':
t14.c:4: internal compiler error: in print_operand, at config/i386/i386.c:7392
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
cnov@wyvern:~/tmp> 

The same works if a and b are int. I also see this bug with GCC 3.3.5 on
i486-linux host/target.


-- 
           Summary: %z produces ICE for char operands
           Product: gcc
           Version: 3.4.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: inline-asm
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: cnovikov at pacbell dot net
  GCC host triplet: i686-pc-cygwin
GCC target triplet: i686-pc-cygwin


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30413

[Bug target/30413] %z produces ICE for char operands

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2007-01-14 06:02 -------
Confirmed, not a regression.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
          Component|inline-asm                  |target
     Ever Confirmed|0                           |1
   GCC host triplet|i686-pc-cygwin              |
 GCC target triplet|i686-pc-cygwin              |i686-*-*
           Keywords|                            |ice-on-invalid-code
      Known to fail|                            |2.95 3.2.3 3.4.0 4.0.0 4.2.0
                   |                            |4.0.4 4.1.2 3.0.4
   Last reconfirmed|0000-00-00 00:00:00         |2007-01-14 06:02:37
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30413

[Bug target/30413] %z produces ICE for char operands

[cnovikov at pacbell dot net]

------- Comment #2 from cnovikov at pacbell dot net  2007-01-14 06:17 -------
(In reply to comment #1)
> Confirmed, not a regression.
> 

You set keywords to "ice-on-invalid-code". In my opinion, the code is valid. %z
is supposed to add an appropriate data width IA-32 insn suffix: l for dwords, w
for words, b for bytes. The expected behavior here is for %z0 to produce "b" in
the assembler output, since "a" is a char.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30413

[Bug target/30413] %z produces ICE for char operands

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2007-01-14 06:34 -------
(In reply to comment #2)
> (In reply to comment #1)
> > Confirmed, not a regression.
> > 
> 
> You set keywords to "ice-on-invalid-code". 

Maybe you are correct but I don't think %zN is documented anywhere.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|ice-on-invalid-code         |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30413

[Bug target/30413] %z produces ICE for char operands

[uros at gcc dot gnu dot org]

------- Comment #4 from uros at gcc dot gnu dot org  2007-01-14 11:14 -------
Subject: Bug 30413

Author: uros
Date: Sun Jan 14 11:14:20 2007
New Revision: 120769

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=120769
Log:
        PR target/30413
        * config/i386/i386.c (print_operand) ['z']: Output 'b' for
        operands of size 1.

testsuite/ChangeLog:

        PR target/30413
        * gcc.target/i386/pr30413.c: New test.


Added:
    trunk/gcc/testsuite/gcc.target/i386/pr30413.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30413

[Bug target/30413] %z produces ICE for char operands

[ubizjak at gmail dot com]

------- Comment #5 from ubizjak at gmail dot com  2007-01-14 11:32 -------
Although %zN is not documented, we advertise it in config/i386/i386.md:

;; The special asm out single letter directives following a '%' are:
;; 'z' mov%z1 would be movl, movw, or movb depending on the mode of
;;     operands[1].

The fix is straightforward and doesn't hurt anything. I have fixed this for
4.3.0.

BTW: The same binary code can be achieved by using plain "mov", as gas figures
out opcode from register name.


-- 

ubizjak at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |ubizjak at gmail dot com
                   |dot org                     |
             Status|NEW                         |ASSIGNED
      Known to work|                            |4.3.0
   Last reconfirmed|2007-01-14 06:02:37         |2007-01-14 11:32:38
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30413

[Bug target/30413] %z produces ICE for char operands

[ubizjak at gmail dot com]

------- Comment #6 from ubizjak at gmail dot com  2007-03-02 15:02 -------
Fixed in mainline. IMO this is not worth to fix on branches due to comment #5.


-- 

ubizjak at gmail dot com changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30413

[Bug target/30413] %z produces ICE for char operands

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30413