[Bug rtl-optimization/49927] [4.7 Regression] ice in spill_failure, at reload1.c:2120

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49927

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-08-01 10:07:57 UTC ---
Caused by http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=176536
Shorter testcase:
char a[1][1];
long long b;

void
foo (void)
{
  --a[b][b];
}

I'd say it is a mistake to allow subregs of DImode pseudos in the addresses for
-m32, it makes sense only for TARGET_64BIT when DImode is just a single general
register.  Because otherwise the subregs of DImode registers in addresses
increase register pressure on the insn in question, especially if in the
address there is more than one.