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re PR ipa/65236 (IPA ICF causes miscompilation in Chromium built with -Os) 

PR ipa/65236
	* g++.dg/ipa/ipa-icf-6.C: New testcase.
	* cgraphunit.c (cgraph_node::expand_thunk): Enable return slot
	opt.

From-SVN: r221077
This commit is contained in:
Jan Hubicka 2015-02-28 21:32:15 +01:00 committed by Jan Hubicka
parent f083b434c2
commit b7aa4a3ab3
4 changed files with 56 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2015-02-28 Jan Hubicka <hubicka@ucw.cz>
PR ipa/65236
* cgraphunit.c (cgraph_node::expand_thunk): Enable return slot
opt.
2015-02-28 Xingxing Pan <xxingpan@marvell.com>
* config/aarch64/aarch64.md: (mov<mode>_aarch64): Change type

8
gcc/cgraphunit.c
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@ -1680,6 +1680,14 @@ cgraph_node::expand_thunk (bool output_asm_thunks, bool force_gimple_thunk)
callees->call_stmt = call;
gimple_call_set_from_thunk (call, true);
gimple_call_set_with_bounds (call, instrumentation_clone);
/* Return slot optimization is always possible and in fact requred to
return values with DECL_BY_REFERENCE. */
if (aggregate_value_p (resdecl, TREE_TYPE (thunk_fndecl))
&& (!is_gimple_reg_type (TREE_TYPE (resdecl))
|| DECL_BY_REFERENCE (resdecl)))
gimple_call_set_return_slot_opt (call, true);
if (restmp && !alias_is_noreturn)
{
gimple_call_set_lhs (call, restmp);

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2015-02-28 Jan Hubicka <hubicka@ucw.cz>
PR ipa/65236
* g++.dg/ipa/ipa-icf-6.C: New testcase.
2015-02-27 Pat Haugen <pthaugen@us.ibm.com>
* gcc.dg/vect/pr59354.c: Move vector producing code to separate function.

37
gcc/testsuite/g++.dg/ipa/ipa-icf-6.C Normal file
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@ -0,0 +1,37 @@
/* { dg-do run } */
/* { dg-options "-O3 -fdump-ipa-icf" } */
struct A {
A() {ptr=&b;}
A(const A &a) {ptr = &b;}
void test() { if (ptr != &b) __builtin_abort ();}
int b;
int *ptr;
};
A test1(A a)
{
a.test();
return a;
}
A test2(A a)
{
a.test();
return a;
}
__attribute__ ((noinline))
static void
test_me (A (*t)(A))
{
struct A a, b=t(a);
b.test ();
}
int
main()
{
test_me (test1);
test_me (test2);
return 0;
}
/* { dg-final { scan-ipa-dump-times "Unified; Wrapper has been created" 1 "icf" } } */
/* { dg-final { cleanup-ipa-dump "icf" } } */