[Bug c++/36686] New: [4.3 regression] qt-4.3.4 compile failure with message "unable to find a register to spill in class 'R0_REGS'"

[Bug c++/36686] New: [4.3 regression] qt-4.3.4 compile failure with message "unable to find a register to spill in class 'R0_REGS'"

[masaki dot chikama at gmail dot com]

gcc-4.3.0 fails to compile with this message when compiling 
qt-4.3.4. gcc-4.1.3 can compile without fail.
They are both natively running on sh4 board.

The message is very similar with Bug #36684. They may have the same root cause.


g++ -c -include .pch/release-shared/QtGui -pipe -fno-exceptions -pthread
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -O2 -g -mieee
-fvisibility=hidden -fvisibility-inlines-hidden -Wall -W -D_REENTRANT -fPIC
-DQT_SHARED -DQT_BUILD_GUI_LIB -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS
-DQT_44_API_QSQLQUERY_FINISH -DQT3_SUPPORT -DQT_MOC_COMPAT
-DQT_RASTER_IMAGEENGINE -DQT_NO_STYLE_MAC -DQT_NO_STYLE_WINDOWSVISTA
-DQT_NO_STYLE_WINDOWSXP -DQ_INTERNAL_QAPP_SRC -DQT_NO_DEBUG -DQT_CORE_LIB
-D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I../../mkspecs/linux-g++ -I.
-I../../include/QtCore -I../../include/QtCore -I../../include
-I../../include/QtGui -I/usr/include/freetype2 -I../3rdparty/harfbuzz/src
-Idialogs -I.moc/release-shared -I/usr/X11R6/include -I.uic/release-shared -o
.obj/release-shared/qcolordialog.o dialogs/qcolordialog.cpp
In file included from dialogs/qcolordialog.cpp:1717:
dialogs/qcolordialog.cpp: In member function 'virtual QSize
QColorPicker::sizeHint() const':
dialogs/qcolordialog.cpp:834: error: unable to find a register to spill in
class 'R0_REGS'
dialogs/qcolordialog.cpp:834: error: this is the insn:
(insn:HI 25 53 26 2 dialogs/qcolordialog.cpp:833 (set (reg:SI 1 r1 [orig:178
pHeight ] [178])
        (mem/c/i:SI (plus:SI (reg/f:SI 1 r1 [175])
                (reg:SI 12 r12)) [11 pHeight+0 S4 A32])) 172 {movsi_ie}
(expr_list:REG_DEAD (reg/f:SI 1 r1 [175])
        (nil)))
dialogs/qcolordialog.cpp:834: confused by earlier errors, bailing out
make[1]: *** [.obj/release-shared/qcolordialog.o] Error 1
make[1]: Leaving directory
`/builddir/build/BUILD/qt-x11-opensource-src-4.3.4/src/gui'


# /usr/bin/gcc -v
Using built-in specs.
Target: sh4-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla
--enable-bootstrap --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions
--enable-languages=c,c++,objc,obj-c++,java,fortran --enable-java-awt=gtk
--disable-dssi --enable-plugin
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre
--enable-libgcj-multifile --enable-java-maintainer-mode
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib
--build=sh4-redhat-linux
Thread model: posix
gcc version 4.3.0 20080404 (Red Hat 4.3.0-6.fs1.1) (GCC)


-- 
           Summary: [4.3 regression] qt-4.3.4 compile failure with message
                    "unable to find a register to spill in class 'R0_REGS'"
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: masaki dot chikama at gmail dot com
 GCC build triplet: sh4-redhat-linux
  GCC host triplet: sh4-redhat-linux
GCC target triplet: sh4-redhat-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36686

[Bug c++/36686] [4.3 regression] qt-4.3.4 compile failure with message "unable to find a register to spill in class 'R0_REGS'"

[masaki dot chikama at gmail dot com]

------- Comment #1 from masaki dot chikama at gmail dot com  2008-07-01 10:13 -------
Created an attachment (id=15839)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15839&action=view)
preprocessed file generated by adding -save-temps


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36686

[Bug target/36686] [4.3 regression] qt-4.3.4 compile failure with message "unable to find a register to spill in class 'R0_REGS'"

[kkojima at gcc dot gnu dot org]

------- Comment #2 from kkojima at gcc dot gnu dot org  2008-07-02 00:20 -------
Could you please send the testcase without using precompiled headers?
See http://gcc.gnu.org/bugs.html#pch.

I also suspect this is a duplicate of PR36684.  Does -fno-schedule-insns
get rid of this error?


-- 

kkojima at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kkojima at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |WAITING
          Component|c++                         |target
   GCC host triplet|sh4-redhat-linux            |
 GCC target triplet|sh4-redhat-linux            |sh4-*-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36686

[Bug target/36686] [4.3 regression] qt-4.3.4 compile failure with message "unable to find a register to spill in class 'R0_REGS'"

[masaki dot chikama at gmail dot com]

------- Comment #3 from masaki dot chikama at gmail dot com  2008-07-02 03:14 -------
>Could you please send the testcase without using precompiled headers?
Do you mean that I should redo without "-include .pch/release-shared/QtGui" ?
I'll attach in next post.

>Does -fno-schedule-insns get rid of this error?
Yes. It passed without failure.
Is this a workaround or right fix ?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36686

[Bug target/36686] [4.3 regression] qt-4.3.4 compile failure with message "unable to find a register to spill in class 'R0_REGS'"

[masaki dot chikama at gmail dot com]

------- Comment #4 from masaki dot chikama at gmail dot com  2008-07-02 03:20 -------
Created an attachment (id=15842)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15842&action=view)
preprocessed file without precompiled headers

gzipped beacuse plain text file's size is 1.5MB


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36686

[Bug target/36686] [4.3 regression] qt-4.3.4 compile failure with message "unable to find a register to spill in class 'R0_REGS'"

[kkojima at gcc dot gnu dot org]

------- Comment #5 from kkojima at gcc dot gnu dot org  2008-07-02 03:47 -------
Thanks for the updated testcase.  I've confirmed that this PR is
a duplicate of PR36684 as you suggested.

> Is this a workaround or right fix ?

SH backend enables first insn scheduling pass for SH4 when
the estimated R0 register pressure is low.  PR36684 reveals that
it doesn't work well for PIC which will make many implicit R0 uses.
It seems that there is no easy way to compute accurate R0 register
pressure in that case.  Also this optimization doesn't make much
difference in performance for such case.  So disabling it for PIC
would be a reasonable fix, I guess.  I'll prepare such patch for
PR36684.


*** This bug has been marked as a duplicate of 36684 ***


-- 

kkojima at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
           Keywords|                            |ice-on-valid-code
      Known to fail|                            |4.3.1 4.4.0
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36686

[Bug target/36686] [4.3 regression] qt-4.3.4 compile failure with message "unable to find a register to spill in class 'R0_REGS'"

[masaki dot chikama at gmail dot com]

------- Comment #6 from masaki dot chikama at gmail dot com  2008-07-02 04:06 -------
Thank you.
I'll learn more about background of this problem 
along with your comment.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36686