[Bug inline-asm/13850] New: Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'can't find a register in class `GENERAL_REGS' while reloading `asm'

[Bug inline-asm/13850] New: Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'can't find a register in class `GENERAL_REGS' while reloading `asm'

[bero at arklinux dot org]

The attached sample code (test case stripped out of ffmpeg, reduced to what's 
necessary to trigger the error) fails to build w/ the ssa branch, works 
perfectly in 3.3.x, and from a quick look, the code seems to be ok.

-- 
           Summary: Fails to compile ffmpeg on x86: can't find a register in
                    class `GENERAL_REGS' while reloading `asm'can't find a
                    register in class `GENERAL_REGS' while reloading `asm'
           Product: gcc
           Version: tree-ssa
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: inline-asm
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bero at arklinux dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug inline-asm/13850] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'can't find a register in class `GENERAL_REGS' while reloading `asm'

[bero at arklinux dot org]

------- Additional Comments From bero at arklinux dot org  2004-01-24 22:33 -------
Created an attachment (id=5569)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=5569&action=view)
test case

test case

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug inline-asm/13850] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-01-24 22:41 -------
What is the command line you used?

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code, RTL
            Summary|Fails to compile ffmpeg on  |Fails to compile ffmpeg on
                   |x86: can't find a register  |x86: can't find a register
                   |in class `GENERAL_REGS'     |in class `GENERAL_REGS'
                   |while reloading `asm'can't  |while reloading `asm'
                   |find a register in class    |
                   |`GENERAL_REGS' while        |
                   |reloading `asm'             |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug inline-asm/13850] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[bero at arklinux dot org]

------- Additional Comments From bero at arklinux dot org  2004-01-24 22:42 -------
The simplest is just 
 
gcc-ssa -c -o test.o dsputil_mmx.c 
 
Adding flags like -O2 or -fomit-frame-pointer doesn't change anything. 

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug inline-asm/13850] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-01-24 22:44 -------
Also i686 is known have problems like this because of how many little registers they have.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
 GCC target triplet|                            |i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug inline-asm/13850] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[bero at arklinux dot org]

------- Additional Comments From bero at arklinux dot org  2004-01-24 22:58 -------
True... Unfortunately we can't fix the CPUs. ;) 
 
Another note: 
It works with gcc 3.3.x only at -O1 and higher. 
 
 
[bero@build-athlon i386]$ gcc --version 2>&1 |head -n 1 
gcc (GCC) 3.3.3 20040111 (Ark Linux 1.0 3.3.3-0.20040111.1ark) 
[bero@build-athlon i386]$ gcc-ssa --version 2>&1 |head -n 1 
gcc-ssa (GCC) 3.5-tree-ssa 20040120 (Ark Linux 3.5-0.ssa20040120.1ark) 
[bero@build-athlon i386]$ gcc -O0 -c -o test.o dsputil_mmx.c 
dsputil_mmx.c: In function `h263_h_loop_filter_mmx': 
dsputil_mmx.c:45: error: can't find a register in class `GENERAL_REGS' while 
reloading `asm' 
[bero@build-athlon i386]$ gcc -O1 -c -o test.o dsputil_mmx.c 
[bero@build-athlon i386]$ gcc-ssa -O0 -c -o test.o dsputil_mmx.c 
dsputil_mmx.c: In function `h263_h_loop_filter_mmx': 
dsputil_mmx.c:45: error: can't find a register in class `GENERAL_REGS' while 
reloading `asm' 
[bero@build-athlon i386]$ gcc-ssa -O1 -c -o test.o dsputil_mmx.c 
dsputil_mmx.c: In function `h263_h_loop_filter_mmx': 
dsputil_mmx.c:45: error: can't find a register in class `GENERAL_REGS' while 
reloading `asm' 
[bero@build-athlon i386]$ gcc-ssa -O99 -c -o test.o dsputil_mmx.c 
dsputil_mmx.c: In function `h263_h_loop_filter_mmx': 
dsputil_mmx.c:45: error: can't find a register in class `GENERAL_REGS' while 
reloading `asm' 
 

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug optimization/13850] [tree-ssa] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-01-25 01:48 -------
Really the code should not be using inline-asm but that is different story.  I think the problem is 
that the tree-ssa is finding some common sub expressions and combining them which is causing 
reload (the register spiller) to fail to find registers/offsets for the contstraints.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
          Component|inline-asm                  |optimization
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-01-25 01:48:41
               date|                            |
            Summary|Fails to compile ffmpeg on  |[tree-ssa] Fails to compile
                   |x86: can't find a register  |ffmpeg on x86: can't find a
                   |in class `GENERAL_REGS'     |register in class
                   |while reloading `asm'       |`GENERAL_REGS' while
                   |                            |reloading `asm'
   Target Milestone|---                         |tree-ssa


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug optimization/13850] [tree-ssa] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[rth at gcc dot gnu dot org]

------- Additional Comments From rth at gcc dot gnu dot org  2004-02-04 02:54 -------
Yes, all of this is quite silly, and should be using <mmintrin.h> instead.

That said, I compute 4 required registers here, so we should have been ok.
The bug appears to be that CSE isn't interested in generating more complex
addressing modes for the memories here.  Not sure why...

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug optimization/13850] [tree-ssa] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[bero at arklinux dot org]

------- Additional Comments From bero at arklinux dot org  2004-02-04 03:21 -------
FWIF, the code is so silly because I've stripped out all parts not related to 
the problem. 
 
It's much more complex (and actually makes a bit of sense) if you don't remove 
the 30 lines between those that trigger the error. ;) 

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug optimization/13850] [tree-ssa] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[rth at redhat dot com]

------- Additional Comments From rth at redhat dot com  2004-02-04 03:46 -------
Subject: Re:  [tree-ssa] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

On Wed, Feb 04, 2004 at 03:21:11AM -0000, bero at arklinux dot org wrote:
> It's much more complex (and actually makes a bit of sense) if you don't
> remove the 30 lines between those that trigger the error. ;) 

No, I've looked at the real code as well.  It *still* ought to be
using <mmintrin.h>.  Either that or quit using C at all and use
the assembler directly.


r~


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug optimization/13850] [tree-ssa] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-03-12 05:01 -------
Minor as the inline-asm should not be used here.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |minor
   Last reconfirmed|2004-01-25 01:48:41         |2004-03-12 05:01:37
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug optimization/13850] [tree-ssa] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[mog dot johnny at gmx dot net]

------- Additional Comments From mog dot johnny at gmx dot net  2004-03-12 23:44 -------
I am having the same problem. 
But with these  
CFLAGS="-O -march=athlon-xp -funroll-loops -pipe" 
 
it works. O6 and O3 and O2 don't work. 
 
Johnny 
 
PS: don't hesitate to send me test code, or ask questions about my system. 
Maybe I am providing ssh access, if we cant't trace the bug otherwise. 

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug rtl-optimization/13850] [3.5 Regression] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[v dot merkatz at gmx dot net]

------- Additional Comments From v dot merkatz at gmx dot net  2004-06-06 11:54 -------
testcase also fails here with gcc 3.4.0

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |v dot merkatz at gmx dot net


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug rtl-optimization/13850] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-07-02 19:23 -------
Not a regression.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[3.5 Regression] Fails to   |Fails to compile ffmpeg on
                   |compile ffmpeg on x86: can't|x86: can't find a register
                   |find a register in class    |in class `GENERAL_REGS'
                   |`GENERAL_REGS' while        |while reloading `asm'
                   |reloading `asm'             |
   Target Milestone|3.5.0                       |---


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug rtl-optimization/13850] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[jbernardo at sourcemage dot org]

------- Additional Comments From jbernardo at sourcemage dot org  2004-07-25 16:00 -------
Same error message compiling util-linux on a athlon64. I can attach the compile
log, if you want.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug rtl-optimization/13850] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[jbernardo at sourcemage dot org]

------- Additional Comments From jbernardo at sourcemage dot org  2004-07-25 16:04 -------
Forgot to add that I see that message with gcc 3.4.1, and I didn't have any
problem with gcc 3.3.4

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850

[Bug rtl-optimization/13850] Fails to compile ffmpeg on x86: can't find a register in class `GENERAL_REGS' while reloading `asm'

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-08-06 07:00 -------


*** This bug has been marked as a duplicate of 11203 ***

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13850