[Bug tree-optimization/49135] ICE in gcc.c-torture/execute/920302-1.c on arm

["ramana at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49135

--- Comment #6 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> 2011-06-03 22:18:04 UTC ---
combine puts 2 and 2 together . 

(insn 11 10 12 (set (reg/f:SI 154)
        (mem/u/c/i:SI (symbol_ref/u:SI ("*.LC0") [flags 0x2]) [4 S4 A32]))
/home/ramana/cos/git/gcc/gcc/testsuite/gcc.c-torture/execute/920302-1.c:14 -1
     (expr_list:REG_EQUAL (label_ref:SI 0)  
        (nil)))

(insn 12 11 13 (set (reg:HI 153)
        (subreg:HI (reg/f:SI 154) 0))
/home/ramana/cos/git/gcc/gcc/testsuite/gcc.c-torture/execute/920302-1.c:14 -1
     (nil))

(insn 13 12 0 (set (reg:SI 142 [ D.2035 ])  
        (zero_extend:SI (reg:HI 153)))
/home/ramana/cos/git/gcc/gcc/testsuite/gcc.c-torture/execute/920302-1.c:14 -1
     (nil))



Trying 11 -> 12:
Successfully matched this instruction:
(set (reg/f:HI 153)
    (mem/u/c/i:HI (symbol_ref/u:SI ("*.LC0") [flags 0x2]) [4 S2 A32]))
deferring deletion of insn with uid = 11.
modifying insn i3    12 r153:HI=[`*.LC0']
deferring rescan insn with uid = 12.

Trying 12 -> 13:
Successfully matched this instruction:
(set (reg:SI 142 [ D.2035 ])
    (zero_extend:SI (mem/u/c/i:HI (symbol_ref/u:SI ("*.LC0") [flags 0x2]) [4 S2
A32])))
deferring deletion of insn with uid = 12.
modifying insn i3    13 r142:SI=zero_extend([`*.LC0'])
deferring rescan insn with uid = 13.

---


(insn 13 12 15 3 (set (reg:SI 142 [ D.2035 ])
        (zero_extend:SI (mem/u/c/i:HI (symbol_ref/u:SI ("*.LC0") [flags 0x2])
[4 S2 A32])))
/home/ramana/cos/git/gcc/gcc/testsuite/gcc.c-torture/execute/920302-1.c:14 150
{*arm_zero_extendhisi2_v6}
     (nil))