[Clang][X86] Add -fexperimental-new-constant-interpreter test coverage to the x86 builtins constexpr test files

[RKSimon]

Similar to #154758 where this was added to the top of avx512f-builtins.c - we need to ensure that the new interpreter can handle all the x86 intrinsics that have been converted to constexpr.

Any CodeGen\X86*builtins.c file that includes "builtin_test_helpers.h" or uses the TEST_CONSTEXPR macro needs to be tested on the new interpreter as well as the current ExprConstant.cpp system.

There is likely to be fallout as either we're missing coverage (or maybe even uncovered a bug) so you might find yourself triaging or raising/fixing additional blocking issues.

[llvmbot]

Hi!

This issue may be a good introductory issue for people new to working on LLVM. If you would like to work on this issue, your first steps are:

1. Check that no other contributor is working on this issue. If someone is assigned to the issue or claimed to be working on it, ping the person. After one week without a response, the assignee may be changed.
2. Leave a comment indicating that you are working on the issue, or just create a pull request after following the steps below. Mention this issue in the description of the pull request.
3. Fix the issue locally.
4. Run the test suite locally. Remember that the subdirectories under test/ create fine-grained testing targets, so you can e.g. use make check-clang-ast to only run Clang's AST tests.
5. Create a Git commit.
6. Run git clang-format HEAD~1 to format your changes.
7. Open a pull request to the upstream repository on GitHub. Detailed instructions can be found in GitHub's documentation. Mention this issue in the description of the pull request.

If you have any further questions about this issue, don't hesitate to ask via a comment in the thread below.

[llvmbot]

@llvm/issue-subscribers-backend-x86

Author: Simon Pilgrim (RKSimon)

Similar to #154758 where this was added to the top of avx512f-builtins.c - we need to ensure that the new interpreter can handle all the x86 intrinsics that have been converted to constexpr.

Any CodeGen\X86*builtins.c file that includes "builtin_test_helpers.h" or uses the TEST_CONSTEXPR macro needs to be tested on the new interpreter as well as the current ExprConstant.cpp system.

There is likely to be fallout as either we're missing coverage (or maybe even uncovered a bug) so you might find yourself triaging or raising/fixing additional blocking issues.

[llvmbot]

@llvm/issue-subscribers-good-first-issue

Author: Simon Pilgrim (RKSimon)

Similar to #154758 where this was added to the top of avx512f-builtins.c - we need to ensure that the new interpreter can handle all the x86 intrinsics that have been converted to constexpr.

Any CodeGen\X86*builtins.c file that includes "builtin_test_helpers.h" or uses the TEST_CONSTEXPR macro needs to be tested on the new interpreter as well as the current ExprConstant.cpp system.

There is likely to be fallout as either we're missing coverage (or maybe even uncovered a bug) so you might find yourself triaging or raising/fixing additional blocking issues.