ARM64/ARM64EC runtime assertions in `P0811R3_midpoint_lerp`
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ARM64
ARM64EC
test
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Description
With the latest available Windows 11 SDK (10.0.26100.4188), P0811R3_midpoint_lerp fails assert(check_feexcept(0)) at runtime on ARM64:
Click to expand test logs for the 2 failing configurations:
C:\GitHub\STL\out\ARM64>python %STL%\tools\scripts\print_failures.py testing_ARM64.log
code: FAIL
name: std :: tests/P0811R3_midpoint_lerp:34
output: Build setup steps:
Build steps:
Command: "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\bin\HostARM64\ARM64\cl.EXE" "C:\GitHub\STL\tests\std\tests\P0811R3_midpoint_lerp\test.cpp" "-IC:\GitHub\STL\out\ARM64\out\inc" "-IC:\GitHub\STL\llvm-project\libcxx\test\support" "-IC:\GitHub\STL\tests\std\include" "/nologo" "/Od" "/W4" "/w14061" "/w14242" "/w14265" "/w14582" "/w14583" "/w14587" "/w14588" "/w14749" "/w14841" "/w14842" "/w15038" "/w15214" "/w15215" "/w15216" "/w15217" "/w15262" "/sdl" "/WX" "/D_ENABLE_STL_INTERNAL_CHECK" "/bigobj" "/FIforce_include.hpp" "/w14365" "/w14668" "/w15267" "/D_ENFORCE_FACET_SPECIALIZATIONS=1" "/w14640" "/Zc:threadSafeInit-" "/EHsc" "/MTd" "/D_ITERATOR_DEBUG_LEVEL=0" "/std:c++latest" "/permissive-" "/fp:strict" "/Od" "-FeC:\GitHub\STL\out\ARM64\tests\std\tests\P0811R3_midpoint_lerp\Output\34\P0811R3_midpoint_lerp.exe" "-link" "-LIBPATH:C:\GitHub\STL\out\ARM64\out\lib\arm64" "-LIBPATH:C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\lib\arm64" "/MANIFEST:EMBED"
Exit Code: 0 (0x0)
Standard Output:
--
test.cpp
--
Intellisense response file steps:
Test setup steps:
Test steps:
Test step failed unexpectedly.
Command: "C:\GitHub\STL\out\ARM64\tests\std\tests\P0811R3_midpoint_lerp\Output\34\P0811R3_midpoint_lerp.exe"
Exit Code: 3 (0x3)
Standard Error:
--
Assertion failed: check_feexcept(0), file C:\GitHub\STL\tests\std\tests\P0811R3_midpoint_lerp\test.cpp, line 1052
abort() has been called--
==================================================
code: FAIL
name: std :: tests/P0811R3_midpoint_lerp:35
output: Build setup steps:
Build steps:
Command: "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\bin\HostARM64\ARM64\cl.EXE" "C:\GitHub\STL\tests\std\tests\P0811R3_midpoint_lerp\test.cpp" "-IC:\GitHub\STL\out\ARM64\out\inc" "-IC:\GitHub\STL\llvm-project\libcxx\test\support" "-IC:\GitHub\STL\tests\std\include" "/nologo" "/Od" "/W4" "/w14061" "/w14242" "/w14265" "/w14582" "/w14583" "/w14587" "/w14588" "/w14749" "/w14841" "/w14842" "/w15038" "/w15214" "/w15215" "/w15216" "/w15217" "/w15262" "/sdl" "/WX" "/D_ENABLE_STL_INTERNAL_CHECK" "/bigobj" "/FIforce_include.hpp" "/w14365" "/w14668" "/w15267" "/D_ENFORCE_FACET_SPECIALIZATIONS=1" "/w14640" "/Zc:threadSafeInit-" "/EHsc" "/MTd" "/D_ITERATOR_DEBUG_LEVEL=0" "/std:c++latest" "/permissive-" "/fp:strict" "/O2" "-FeC:\GitHub\STL\out\ARM64\tests\std\tests\P0811R3_midpoint_lerp\Output\35\P0811R3_midpoint_lerp.exe" "-link" "-LIBPATH:C:\GitHub\STL\out\ARM64\out\lib\arm64" "-LIBPATH:C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\lib\arm64" "/MANIFEST:EMBED"
Exit Code: 0 (0x0)
Standard Output:
--
test.cpp
--
Standard Error:
--
cl : Command line warning D9025 : overriding '/Od' with '/O2'
--
Intellisense response file steps:
Test setup steps:
Test steps:
Test step failed unexpectedly.
Command: "C:\GitHub\STL\out\ARM64\tests\std\tests\P0811R3_midpoint_lerp\Output\35\P0811R3_midpoint_lerp.exe"
Exit Code: 3 (0x3)
Standard Error:
--
Assertion failed: check_feexcept(0), file C:\GitHub\STL\tests\std\tests\P0811R3_midpoint_lerp\test.cpp, line 1052
abort() has been called--
I'm going to skip these asserts for ARM64, but we should investigate the root cause.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with tests/std/tests/P0811R3_midpoint_lerp/test.cpp, especially lines 1048-1053 and the check_feexcept(0) assertions. Reproduce test configurations 34 and 35 on ARM64 with the reported Windows 11 SDK and compare their behavior with other configurations. Done means identifying the ARM64/ARM64EC root cause and determining the appropriate test handling rather than only skipping the assertions.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- testing-qa
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100