The following testcase is miscompiled on ppc and ppc64 at -Os.
In E::~E() GCSE changes:
(insn 3 6 4 0 (set (reg/f:DI 121 [ this ])
(reg:DI 3 3 [ this ])) 297 {*movdi_internal64} (nil)
(nil))
...
(insn 22 46 23 1 (set (reg/f:DI 125)
(plus:DI (reg/f:DI 121 [ this ])
(const_int 16 [0x10]))) 208 {*adddi3_internal1} (nil)
(nil))
...
(insn 30 29 31 2 (set (reg/f:DI 129)
(plus:DI (reg/f:DI 121 [ this ])
(const_int 16 [0x10]))) 208 {*adddi3_internal1} (nil)
(nil))
(each insn in a different bb, the last in EH bb) into:
(insn 57 6 3 0 (set (reg/f:DI 130)
(plus:DI (reg/f:DI 121 [ this ])
(const_int 16 [0x10]))) 208 {*adddi3_internal1} (nil)
(nil))
(insn 3 57 4 0 (set (reg/f:DI 121 [ this ])
(reg:DI 3 3 [ this ])) 297 {*movdi_internal64} (nil)
(nil))
and using pseudo 130 in place of 125 and 129.
--
Summary: GCSE? caused miscompilation
Product: gcc
Version: 4.0.2
Status: UNCONFIRMED
Severity: critical
Priority: P2
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jakub at redhat dot com
CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: powerpc{,64}-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23299
