Comparing reduced.cpp.153r.cse1 in r172837 and the previous commit.
--- reduced.cpp.153r.cse1 from gcc trunk r172835 [works]
(insn 18 17 19 2 (parallel [
(set (mem/s:SI (reg/f:SI 138) [5 MEM[(struct A *)0B]+0 S4 A32])
(reg:SI 0 r0))
(set (mem/s:SI (plus:SI (reg/f:SI 138)
(const_int 4 [0x4])) [5 MEM[(struct A *)0B]+4 S4 A32])
(reg:SI 1 r1))
]) reference/reduced.cpp:6 373 {*stm2_ia}
(nil))
--- reduced.cpp.153r.cse1 from gcc trunk r172837 [has ICE]
(insn 24 23 25 2 (parallel [
(set (mem/s:SI (reg/f:SI 141) [5 MEM[(struct A *)0B]+0 S4 A32])
(reg:SI 0 r0))
(set (mem/s:SI (plus:SI (reg/f:SI 141)
(const_int 4 [0x4])) [5 MEM[(struct A *)0B]+4 S4 A32])
(reg/f:SI 26 afp)) <--- r1 changed to afp here
]) reference/reduced.cpp:6 373 {*stm2_ia}
(nil))
This gets re-written later:
-- reduced.cpp.190r.ira from gcc trunk r172837
(insn 24 29 28 2 (parallel [
(set (mem/s:SI (reg/f:SI 4 r4 [141]) [5 MEM[(struct A *)0B]+0 S4 A32
])
(reg:SI 0 r0))
(set (mem/s:SI (plus:SI (reg/f:SI 4 r4 [141])
(const_int 4 [0x4])) [5 MEM[(struct A *)0B]+4 S4 A32])
(plus:SI (reg/f:SI 13 sp) <---\__ was aftp
(const_int 1048 [0x418]))) <---/
]) reference/reduced.cpp:6 373 {*stm2_ia}
(nil))
The (plus:SI (reg/f:SI 13 sp) (const_int 1048 [0x418])) is the invalid operand
which causes the ICE during final.
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https://bugs.launchpad.net/bugs/1251930
Title:
[4.8 regression] internal compiler error while compiling OpenCV 2.4.7
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