[libcxx-commits] [libcxx] [libc++] Optimize std::{, ranges}::{fill, fill_n} for segmented iterators (PR #132665)

Wed Oct 15 16:39:36 PDT 2025

frederick-vs-ja wrote:

There's weird lldb test failure....

```
2025-10-15T14:11:22.1782806Z Exit Code: 1
2025-10-15T14:11:22.1783018Z 
2025-10-15T14:11:22.1783168Z Command Output (stdout):
2025-10-15T14:11:22.1783524Z --
2025-10-15T14:11:22.1784525Z lldb version 22.0.0git (https://github.com/llvm/llvm-project revision 3a44bb8cd476316ee7fa3673cb1d1769b7f8df1a)
2025-10-15T14:11:22.1785503Z   clang revision 3a44bb8cd476316ee7fa3673cb1d1769b7f8df1a
2025-10-15T14:11:22.1786073Z   llvm revision 3a44bb8cd476316ee7fa3673cb1d1769b7f8df1a
2025-10-15T14:11:22.1786848Z Skipping the following test categories: ['msvcstl', 'dsym', 'gmodules', 'debugserver', 'objc']
2025-10-15T14:11:22.1787554Z 
2025-10-15T14:11:22.1787665Z --
2025-10-15T14:11:22.1787958Z Command Output (stderr):
2025-10-15T14:11:22.1788303Z --
2025-10-15T14:11:22.1790024Z UNSUPPORTED: LLDB (/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bootstrapping-build/bin/clang-x86_64) :: test_dsym (TestArrayFromStdModule.TestCase) (test case does not fall in any category of interest for this run) 
2025-10-15T14:11:22.1792485Z FAIL: LLDB (/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bootstrapping-build/bin/clang-x86_64) :: test_dwarf (TestArrayFromStdModule.TestCase)
2025-10-15T14:11:22.1794388Z FAIL: LLDB (/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bootstrapping-build/bin/clang-x86_64) :: test_dwo (TestArrayFromStdModule.TestCase)
2025-10-15T14:11:22.1795529Z ======================================================================
2025-10-15T14:11:22.1796012Z FAIL: test_dwarf (TestArrayFromStdModule.TestCase)
2025-10-15T14:11:22.1796546Z ----------------------------------------------------------------------
2025-10-15T14:11:22.1797068Z Traceback (most recent call last):
2025-10-15T14:11:22.1798424Z   File "/home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 1804, in test_method
2025-10-15T14:11:22.1799484Z     return attrvalue(self)
2025-10-15T14:11:22.1801300Z   File "/home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/packages/Python/lldbsuite/test/decorators.py", line 156, in wrapper
2025-10-15T14:11:22.1802353Z     return func(*args, **kwargs)
2025-10-15T14:11:22.1803361Z   File "/home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/packages/Python/lldbsuite/test/decorators.py", line 156, in wrapper
2025-10-15T14:11:22.1804421Z     return func(*args, **kwargs)
2025-10-15T14:11:22.1805621Z   File "/home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/test/API/commands/expression/import-std-module/array/TestArrayFromStdModule.py", line 45, in test
2025-10-15T14:11:22.1806993Z     self.expect_expr("a.front()", result_type=value_type, result_value="3")
2025-10-15T14:11:22.1808423Z   File "/home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 2572, in expect_expr
2025-10-15T14:11:22.1809623Z     value_check.check_value(self, eval_result, str(eval_result))
2025-10-15T14:11:22.1810964Z   File "/home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 313, in check_value
2025-10-15T14:11:22.1812185Z     test_base.assertEqual(self.expect_value, val.GetValue(), this_error_msg)
2025-10-15T14:11:22.1812996Z AssertionError: '3' != None : $2 = <invalid type>
2025-10-15T14:11:22.1813491Z Checking SBValue: $2 = <invalid type>
2025-10-15T14:11:22.1814291Z Config=x86_64-/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bootstrapping-build/bin/clang
2025-10-15T14:11:22.1815087Z ======================================================================
2025-10-15T14:11:22.1815603Z FAIL: test_dwo (TestArrayFromStdModule.TestCase)
2025-10-15T14:11:22.1816095Z ----------------------------------------------------------------------
2025-10-15T14:11:22.1816692Z Traceback (most recent call last):
2025-10-15T14:11:22.1817627Z   File "/home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 1804, in test_method
2025-10-15T14:11:22.1818498Z     return attrvalue(self)
2025-10-15T14:11:22.1819308Z   File "/home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/packages/Python/lldbsuite/test/decorators.py", line 156, in wrapper
2025-10-15T14:11:22.1820371Z     return func(*args, **kwargs)
2025-10-15T14:11:22.1821383Z   File "/home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/packages/Python/lldbsuite/test/decorators.py", line 156, in wrapper
2025-10-15T14:11:22.1822320Z     return func(*args, **kwargs)
2025-10-15T14:11:22.1824058Z   File "/home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/test/API/commands/expression/import-std-module/array/TestArrayFromStdModule.py", line 45, in test
2025-10-15T14:11:22.1825362Z     self.expect_expr("a.front()", result_type=value_type, result_value="3")
2025-10-15T14:11:22.1826552Z   File "/home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 2572, in expect_expr
2025-10-15T14:11:22.1827748Z     value_check.check_value(self, eval_result, str(eval_result))
2025-10-15T14:11:22.1828783Z   File "/home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 313, in check_value
2025-10-15T14:11:22.1830084Z     test_base.assertEqual(self.expect_value, val.GetValue(), this_error_msg)
2025-10-15T14:11:22.1830698Z AssertionError: '3' != None : $2 = <invalid type>
2025-10-15T14:11:22.1831148Z Checking SBValue: $2 = <invalid type>
2025-10-15T14:11:22.1831920Z Config=x86_64-/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bootstrapping-build/bin/clang
2025-10-15T14:11:22.1833084Z ----------------------------------------------------------------------
2025-10-15T14:11:22.1833739Z Ran 3 tests in 7.151s
2025-10-15T14:11:22.1833944Z 
2025-10-15T14:11:22.1834088Z FAILED (failures=2, skipped=1)
2025-10-15T14:11:22.1834465Z Failures per category:
2025-10-15T14:11:22.1834770Z libc++ - 2
2025-10-15T14:11:22.1835035Z dwarf - 1
2025-10-15T14:11:22.1835291Z expression - 2
2025-10-15T14:11:22.1835573Z std-module - 2
2025-10-15T14:11:22.1835842Z dwo - 1
```

https://github.com/llvm/llvm-project/pull/132665