* [PATCH] c++: satisfaction value of type const bool [PR104410]
@ 2022-02-07 14:57 Patrick Palka
2022-02-07 20:35 ` Jason Merrill
0 siblings, 1 reply; 2+ messages in thread
From: Patrick Palka @ 2022-02-07 14:57 UTC (permalink / raw)
To: gcc-patches
Here constant evaluation of the atomic constraint use_func_v<T> with T=int
sensibly yields an INTEGER_CST of type const bool, but the assert in
satisfaction_value expects unqualified bool. Let's just relax the
assert to accept cv-qualified bool more generally.
Bootstrapped and regtested on x86_64-pc-linux-gnu, does this look OK for
trunk and 11?
PR c++/104410
gcc/cp/ChangeLog:
* constraint.cc (satisfaction_value): Relax assert to accept
cv-qualified bool.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-pr104410.C: New test.
---
gcc/cp/constraint.cc | 3 ++-
gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C | 6 ++++++
2 files changed, 8 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C
diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
index cc4df4216ef..06ebbd1d19e 100644
--- a/gcc/cp/constraint.cc
+++ b/gcc/cp/constraint.cc
@@ -2818,7 +2818,8 @@ satisfaction_value (tree t)
return t;
gcc_assert (TREE_CODE (t) == INTEGER_CST
- && same_type_p (TREE_TYPE (t), boolean_type_node));
+ && same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (t),
+ boolean_type_node));
if (integer_zerop (t))
return boolean_false_node;
else
diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C b/gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C
new file mode 100644
index 00000000000..dac08e10a0f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C
@@ -0,0 +1,6 @@
+// PR c++/104410
+// { dg-do compile { target c++20 } }
+
+template<class T> constexpr bool use_func_v{};
+template<class T> void f() requires use_func_v<T> || true { }
+template void f<int>();
--
2.35.1.46.g38062e73e0
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] c++: satisfaction value of type const bool [PR104410]
2022-02-07 14:57 [PATCH] c++: satisfaction value of type const bool [PR104410] Patrick Palka
@ 2022-02-07 20:35 ` Jason Merrill
0 siblings, 0 replies; 2+ messages in thread
From: Jason Merrill @ 2022-02-07 20:35 UTC (permalink / raw)
To: Patrick Palka, gcc-patches
On 2/7/22 09:57, Patrick Palka wrote:
> Here constant evaluation of the atomic constraint use_func_v<T> with T=int
> sensibly yields an INTEGER_CST of type const bool, but the assert in
> satisfaction_value expects unqualified bool. Let's just relax the
> assert to accept cv-qualified bool more generally.
>
> Bootstrapped and regtested on x86_64-pc-linux-gnu, does this look OK for
> trunk and 11?
OK for both.
> PR c++/104410
>
> gcc/cp/ChangeLog:
>
> * constraint.cc (satisfaction_value): Relax assert to accept
> cv-qualified bool.
>
> gcc/testsuite/ChangeLog:
>
> * g++.dg/cpp2a/concepts-pr104410.C: New test.
> ---
> gcc/cp/constraint.cc | 3 ++-
> gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C | 6 ++++++
> 2 files changed, 8 insertions(+), 1 deletion(-)
> create mode 100644 gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C
>
> diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
> index cc4df4216ef..06ebbd1d19e 100644
> --- a/gcc/cp/constraint.cc
> +++ b/gcc/cp/constraint.cc
> @@ -2818,7 +2818,8 @@ satisfaction_value (tree t)
> return t;
>
> gcc_assert (TREE_CODE (t) == INTEGER_CST
> - && same_type_p (TREE_TYPE (t), boolean_type_node));
> + && same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (t),
> + boolean_type_node));
> if (integer_zerop (t))
> return boolean_false_node;
> else
> diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C b/gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C
> new file mode 100644
> index 00000000000..dac08e10a0f
> --- /dev/null
> +++ b/gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C
> @@ -0,0 +1,6 @@
> +// PR c++/104410
> +// { dg-do compile { target c++20 } }
> +
> +template<class T> constexpr bool use_func_v{};
> +template<class T> void f() requires use_func_v<T> || true { }
> +template void f<int>();
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