Hi,
this fixes an ICE introduced on the mainline by my fix for PR middle-end/97078
where I changed use_register_for_decl to return true at -O0 for a parameter of
a thunk. It turns out that we need to do the same for a result in this case.
Tested on x86-64/Linux, OK for the mainline?
2020-12-03 Eric Botcazou
PR middle-end/98082
* function.c (use_register_for_decl): Also return true for a result
if cfun->tail_call_marked is true.
2020-12-03 Eric Botcazou
* g++.dg/cpp2a/pr98082.C: New test.
--
Eric Botcazoudiff --git a/gcc/function.c b/gcc/function.c
index 59fd72b0e82..af9618e18df 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -2206,13 +2206,15 @@ use_register_for_decl (const_tree decl)
/* Otherwise, if RESULT_DECL is DECL_BY_REFERENCE, it will take
the function_result_decl's assignment. Since it's a pointer,
we can short-circuit a number of the tests below, and we must
- duplicat e them because we don't have the
- function_result_decl to test. */
+ duplicate them because we don't have the function_result_decl
+ to test. */
if (!targetm.calls.allocate_stack_slots_for_args ())
return true;
/* We don't set DECL_IGNORED_P for the function_result_decl. */
if (optimize)
return true;
+ if (cfun->tail_call_marked)
+ return true;
/* We don't set DECL_REGISTER for the function_result_decl. */
return false;
}
/* PR middle-end/98082 */
/* Reported by Martin Liska */
/* { dg-do compile { target c++20 } } */
/* { dg-options "-fipa-icf" } */
class GoodIter {
public:
GoodIter();
GoodIter(GoodIter &);
};
GoodIter operator-(int, GoodIter) { return GoodIter(); }
GoodIter operator+(int, GoodIter) { return GoodIter(); }
