[Bug target/37905] New: m68k coldfire uses bad mode when extending long long

[jifl-bugzilla at jifvik dot org]

Compile the following code with: m68k-elf-gcc -c -O2 -mcpu=5272 lltest.c
--save-temps -v

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
long long fred;
void broken(int b)
{
    fred = (long long)b;
}
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

The assembler will correctly report:
lltest.s:9: Error: operands mismatch -- statement `move.l 8(%fp),fred+4'
ignored

This is because this combination of modes ( move.l (d16,Ax),(xxx).L ) is
invalid on coldfires. You'll get the same error if you specify a different cpu.

The problem is in extendsidi2_mem in m68k.md. The change was introduced by
Roman Zippel here: http://gcc.gnu.org/ml/gcc-patches/2007-01/msg02475.html

I was able to work around the problem, and will attach the patch. The patch may
not be ideal in all circumstances but I believe it does fix the problem.

Jifl


-- 
           Summary: m68k coldfire uses bad mode when extending long long
           Product: gcc
           Version: 4.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jifl-bugzilla at jifvik dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: m68k-elf


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37905