[llvm-bugs] [Bug 49102] New: [NewPM] Compile time regression on SIMD

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49102

            Bug ID: 49102
           Summary: [NewPM] Compile time regression on SIMD
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Core LLVM classes
          Assignee: unassignedbugs at nondot.org
          Reporter: alonzakai at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 24500
  --> https://bugs.llvm.org/attachment.cgi?id=24500&action=edit
testcase

The attached testcase is from test_avx in emscripten. With the old pass manager
on -O3 it took around 8 seconds to compile, but with the new pass manager it
runs for over 7 minutes (a timeout on our CI was how we noticed).

STR:

clang b.cpp -f[no-]legacy-pass-manager -msimd128 -target wasm32 -c -O3

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