[X86][Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - add AVX512 integer comparison intrinsics to be used in constexpr

[RKSimon]

The core integer comparison intrinsics could be used in constexpr:

_mm_cmp_epi8_mask _mm_cmp_epu8_mask
_mm_cmp_epi16_mask _mm_cmp_epu16_mask
_mm_cmp_epi32_mask _mm_cmp_epu32_mask
_mm_cmp_epi64_mask _mm_cmp_epu64_mask

_mm256_cmp_epi8_mask _mm256_cmp_epu8_mask
_mm256_cmp_epi16_mask _mm256_cmp_epu16_mask
_mm256_cmp_epi32_mask _mm256_cmp_epu32_mask
_mm256_cmp_epi64_mask _mm256_cmp_epu64_mask

_mm512_cmp_epi8_mask _mm512_cmp_epu8_mask
_mm512_cmp_epi16_mask _mm512_cmp_epu16_mask
_mm512_cmp_epi32_mask _mm512_cmp_epu32_mask
_mm512_cmp_epi64_mask _mm512_cmp_epu64_mask

These need to handle the comparison modes detailed in the Intel Intrinsics Guide:

0: OP := _MM_CMPINT_EQ
1: OP := _MM_CMPINT_LT
2: OP := _MM_CMPINT_LE
3: OP := _MM_CMPINT_FALSE
4: OP := _MM_CMPINT_NE
5: OP := _MM_CMPINT_NLT
6: OP := _MM_CMPINT_NLE
7: OP := _MM_CMPINT_TRUE

There are a LOT of wrappers to these intrinsics (e.g. eq/ge/gt/le/lt/neq variants) - ideally we need test coverage for all of them. To avoid incredible boredom you should probably write a script to autogen the TEST_CONSTEXPR lines somehow that you then copy+paste into the relevant locations.

[llvmbot]

@llvm/issue-subscribers-backend-x86

Author: Simon Pilgrim (RKSimon)

The core integer comparison intrinsics could be used in constexpr: ``` _mm512_cmp_epi8_mask _mm512_cmp_epu8_mask _mm512_cmp_epi16_mask _mm512_cmp_epu16_mask _mm512_cmp_epi32_mask _mm512_cmp_epu32_mask _mm512_cmp_epi64_mask _mm512_cmp_epu64_mask ``` These need to handle the comparison modes detaieds in the Intel Intrinsics Guide: ``` 0: OP := _MM_CMPINT_EQ 1: OP := _MM_CMPINT_LT 2: OP := _MM_CMPINT_LE 3: OP := _MM_CMPINT_FALSE 4: OP := _MM_CMPINT_NE 5: OP := _MM_CMPINT_NLT 6: OP := _MM_CMPINT_NLE 7: OP := _MM_CMPINT_TRUE ``` There are a LOT of wrappers to these intrinsics (e.g. eq/ge/gt/le/lt/neq variants) - ideally we need test coverage for all of them. To avoid incredible boredom you should probably write a script to autogen these somehow.

[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-good-first-issue

Author: Simon Pilgrim (RKSimon)

The core integer comparison intrinsics could be used in constexpr: ``` _mm512_cmp_epi8_mask _mm512_cmp_epu8_mask _mm512_cmp_epi16_mask _mm512_cmp_epu16_mask _mm512_cmp_epi32_mask _mm512_cmp_epu32_mask _mm512_cmp_epi64_mask _mm512_cmp_epu64_mask ``` These need to handle the comparison modes detaieds in the Intel Intrinsics Guide: ``` 0: OP := _MM_CMPINT_EQ 1: OP := _MM_CMPINT_LT 2: OP := _MM_CMPINT_LE 3: OP := _MM_CMPINT_FALSE 4: OP := _MM_CMPINT_NE 5: OP := _MM_CMPINT_NLT 6: OP := _MM_CMPINT_NLE 7: OP := _MM_CMPINT_TRUE ``` There are a LOT of wrappers to these intrinsics (e.g. eq/ge/gt/le/lt/neq variants) - ideally we need test coverage for all of them. To avoid incredible boredom you should probably write a script to autogen these somehow.

[shri-acha]

@RKSimon hey, i'm working on this issue, could I be assigned please?

[sskzakaria]

@shri-acha Hey, I was working on implementing these same comparisons in #162071, lmk if you want to work on this together.