[llvm-bugs] [Bug 50724] New: Optimizer taking ~forever

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50724

            Bug ID: 50724
           Summary: Optimizer taking ~forever
           Product: clang
           Version: 12.0
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dave at boostpro.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Created attachment 24956
  --> https://bugs.llvm.org/attachment.cgi?id=24956&action=edit
Single source file

/tmp » clang++ --version
Apple clang version 12.0.5 (clang-1205.0.22.9)
Target: x86_64-apple-darwin20.5.0
Thread model: posix

'clang++' '-O0' -std=c++11 'gen.cpp' '-o' 'gen.cpp.out'  1.16s user 0.07s
system 98% cpu 1.241 total
'clang++' '-O1' -std=c++11 'gen.cpp' '-o' 'gen.cpp.out'  11.30s user 0.27s
system 99% cpu 11.579 total
'clang++' '-O2' -std=c++11 'gen.cpp' '-o' 'gen.cpp.out'  288.87s user 8.46s
system 99% cpu 4:57.36 total

The attached program takes a really long time to optimize; I think clang should
do better.

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