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Subject: [Bug rtl-optimization/46088] [4.6 Regression] ICE: SIGSEGV in ix86_binary_operator_ok (i386.c:15025) with -Os -fnon-call-exceptions -fpeel-loops
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46088

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

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

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-11-11 10:59:32 UTC ---
That's normal before reload is completed.  Recog can be called either with
pnum_clobbers NULL, then it will only try to match if all the clobbers are
there, or if pnum_clobbers is non-NULL, it tries to match the insn without the
clobbers and tell the caller how many clobbers would be needed to make the insn
valid, then
add_clobbers may be called to actually add those clobbers.

Unfortunately, the
*ashl<mode>3_cconly
*<shiftrt_insn><mode>3_cconly
patterns (the only two I could find in config/i386/i386.md) reference this
clobber through ix86_binary_operator_ok, which is of course a big no no if the
clobber does not exist.

I guess the easiest fix would be just not to call ix86_binary_operator_ok here,
but some different predicate, like ix86_binary_operator_ok, but which would not
look at operands[0] aka dst, instead assume it is something matching
scratch_operand predicate.