diff options
author | Jakub Jelinek <jakub@redhat.com> | 2020-08-10 17:53:46 +0200 |
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committer | Giuliano Belinassi <giuliano.belinassi@usp.br> | 2020-08-17 15:07:55 -0300 |
commit | c2574d63c52a690a703b802142ffaeca115fad84 (patch) | |
tree | 29871e9d718d9ed5404eb6c7d5edc4245b0833a0 /gcc/testsuite | |
parent | 53cf2ed28ca11ff19b73ab73065e20c9d3c47861 (diff) |
c++: Fix constexpr evaluation of SPACESHIP_EXPR [PR96497]
The following valid testcase is rejected, because cxx_eval_binary_expression
is called on the SPACESHIP_EXPR with lval = true, as the address of the
spaceship needs to be passed to a method call.
After recursing on the operands and calling genericize_spaceship which turns
it into a TARGET_EXPR with initialization, we call cxx_eval_constant_expression
on it which succeeds, but then we fall through into code that will
VERIFY_CONSTANT (r) which FAILs because it is an address of a variable. Rather
than avoiding that for lval = true and SPACESHIP_EXPR, the patch just tail
calls cxx_eval_constant_expression - I believe that call should perform all
the needed verifications.
2020-08-10 Jakub Jelinek <jakub@redhat.com>
PR c++/96497
* constexpr.c (cxx_eval_binary_expression): For SPACESHIP_EXPR, tail
call cxx_eval_constant_expression after genericize_spaceship to avoid
undesirable further VERIFY_CONSTANT.
* g++.dg/cpp2a/spaceship-constexpr3.C: New test.
Diffstat (limited to 'gcc/testsuite')
-rw-r--r-- | gcc/testsuite/g++.dg/cpp2a/spaceship-constexpr3.C | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/cpp2a/spaceship-constexpr3.C b/gcc/testsuite/g++.dg/cpp2a/spaceship-constexpr3.C new file mode 100644 index 00000000000..95f03e6e231 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp2a/spaceship-constexpr3.C @@ -0,0 +1,7 @@ +// PR c++/96497 +// { dg-do compile { target c++20 } } + +#include <compare> + +static_assert(std::partial_ordering(std::strong_ordering::less) < 0); +static_assert(std::partial_ordering(1 <=> 2) < 0); |