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))
