Testcase, compile at -O2. A clone "g.clone.0" is formed which is the same as
"g", only the second argument has been dropped. The bug is that in the
CALL_EXPR the type of the called function is still the original type.
// begin testcase
static __attribute__((noinline)) int g(int i, int j) {
if (j != 0) return 0;
return i;
}
int f(int i) { return g(i, 0); }
// end testcase
Breaking on verify_gimple_call, and waiting until after "Assembling functions:
g.clone.0 float" is printed, notice how the type of the addr_expr is a pointer
to "type <function_type 0x7ffff70c2540 type <integer_type 0x7ffff7e8c540 int>",
while the type of g.clone.0 (see arg 0) is "type <function_type 0x7ffff70c2e40
type <integer_type 0x7ffff7e8c540 int>", and these two types do not match,
though they should.
(gdb) call debug_tree(fn)
<addr_expr 0x7ffff7ff0b00
type <pointer_type 0x7ffff70c26c0
type <function_type 0x7ffff70c2540 type <integer_type 0x7ffff7e8c540
int>
QI
size <integer_cst 0x7ffff7e7b7e0 constant 8>
unit size <integer_cst 0x7ffff7e7b810 constant 1>
align 8 symtab 0 alias set -1 canonical type 0x7ffff70c2540
arg-types <tree_list 0x7ffff70da3c0 value <integer_type
0x7ffff7e8c540 int>
chain <tree_list 0x7ffff70da390 value <integer_type
0x7ffff7e8c540 int>
chain <tree_list 0x7ffff7e999f0 value <void_type
0x7ffff7e9b3c0 void>>>>
pointer_to_this <pointer_type 0x7ffff70c26c0>>
unsigned DI
size <integer_cst 0x7ffff7e7bb70 constant 64>
unit size <integer_cst 0x7ffff7e7bba0 constant 8>
align 64 symtab 0 alias set -1 canonical type 0x7ffff70c26c0>
readonly constant
arg 0 <function_decl 0x7ffff7123200 g.clone.0
type <function_type 0x7ffff70c2e40 type <integer_type 0x7ffff7e8c540
int>
QI size <integer_cst 0x7ffff7e7b7e0 8> unit size <integer_cst
0x7ffff7e7b810 1>
align 8 symtab 0 alias set -1 canonical type 0x7ffff70c2540
arg-types <tree_list 0x7ffff70daa20 value <integer_type
0x7ffff7e8c540 int> chain <tree_list 0x7ffff7e999f0>>
pointer_to_this <pointer_type 0x7ffff70c26c0>>
readonly addressable asm_written used nothrow static decl_5 QI file
clone.c line 1 col 38 align 8 attributes <tree_list 0x7ffff70da3f0> initial
<error_mark 0x7ffff7e86e60> abstract_origin <function_decl 0x7ffff70c1c00 g>
arguments <parm_decl 0x7ffff7e84d80 i type <integer_type 0x7ffff7e8c540
int>
used SI file clone.c line 1 col 44
size <integer_cst 0x7ffff7e7ba80 constant 32>
unit size <integer_cst 0x7ffff7e7b6f0 constant 4>
align 32 context <function_decl 0x7ffff7123200 g.clone.0>
abstract_origin <parm_decl 0x7ffff7e846c0 i>
(reg/v:SI 0 ax [orig:59 i ] [59]) arg-type <integer_type
0x7ffff7e8c540 int>
incoming-rtl (reg:SI 5 di [ i ])>
result <result_decl 0x7ffff70db100 D.2707 type <integer_type
0x7ffff7e8c540 int>
used ignored regdecl SI file clone.c line 1 col 38 size
<integer_cst 0x7ffff7e7ba80 32> unit size <integer_cst 0x7ffff7e7b6f0 4>
align 32 context <function_decl 0x7ffff7123200 g.clone.0>
abstract_origin <result_decl 0x7ffff70db000 D.1606>
(reg:SI 58 [ <retval> ])>
(mem:QI (symbol_ref:DI ("g.clone.0") [flags 0x3] <function_decl
0x7ffff7123200 g.clone.0>) [0 S1 A8])>
clone.c:5:16>
--
Summary: Type of ADDR_EXPR in CALL_EXPR not rebuilt when function
is cloned
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: baldrick at free dot fr
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41355
