[Bug c/32874] New: Strange global register allocation, depends on order of functions

[Bug c/32874] New: Strange global register allocation, depends on order of functions

[ecd at brainaid dot de]

I have 3 global register variables, 1 pointer to a struct and 2 unsigned
integers. Next I have 2 functions, each working on the pointer and on one of
the integers. The generated output looks strange in the first place, and is
dependant on the order of the two functions in the input .c file.


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           Summary: Strange global register allocation, depends on order of
                    functions
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ecd at brainaid dot de
 GCC build triplet: sparc-linux-gnu
  GCC host triplet: sparc-linux-gnu
GCC target triplet: sparc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32874

[Bug c/32874] Strange global register allocation, depends on order of functions

[ecd at brainaid dot de]

------- Comment #1 from ecd at brainaid dot de  2007-07-24 08:51 -------
Created an attachment (id=13955)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13955&action=view)
Input file to trigger the problem


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32874

[Bug c/32874] Strange global register allocation, depends on order of functions

[ecd at brainaid dot de]

------- Comment #2 from ecd at brainaid dot de  2007-07-24 08:52 -------
Created an attachment (id=13956)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13956&action=view)
Input file to trigger the problem with order of functions reversed


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32874

[Bug c/32874] Strange global register allocation, depends on order of functions

[ecd at brainaid dot de]

------- Comment #3 from ecd at brainaid dot de  2007-07-24 08:52 -------
Created an attachment (id=13957)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13957&action=view)
Output number 1


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32874

[Bug c/32874] Strange global register allocation, depends on order of functions

[ecd at brainaid dot de]

------- Comment #4 from ecd at brainaid dot de  2007-07-24 08:53 -------
Created an attachment (id=13958)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13958&action=view)
Output number 2 (function order reversed)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32874

[Bug c/32874] Strange global register allocation, depends on order of functions

[ecd at brainaid dot de]

------- Comment #5 from ecd at brainaid dot de  2007-07-24 08:54 -------
Command line to compile the samples:

gcc -Wall -O2   -ffixed-i0 -ffixed-i1 -ffixed-i2 -ffixed-i3    
-fno-strict-aliasing    -fno-delayed-branch     -fno-reorder-blocks    
-fno-optimize-sibling-calls -Wa,-Av9a -I. -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
-D_LARGEFILE_SOURCE -save-temps -da      -c op.c -o op.o

gcc -v output:

Using built-in specs.
Target: sparc-linux-gnu
Configured with: ../src/configure -v
--enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr
--enable-shared --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix --enable-nls
--program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu
--enable-libstdcxx-debug --enable-mpfr --with-cpu=v8 --enable-checking=release
sparc-linux-gnu
Thread model: posix
gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32874

[Bug middle-end/32874] Strange global register allocation, depends on order of functions

[ebotcazou at gcc dot gnu dot org]

------- Comment #6 from ebotcazou at gcc dot gnu dot org  2010-09-20 22:20 -------
Not a bug.


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ebotcazou at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ebotcazou at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |WONTFIX


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32874