[llvm-bugs] [Bug 31382] New: r289696 regressed TSan runtime library codegen

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31382

            Bug ID: 31382
           Summary: r289696 regressed TSan runtime library codegen
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Interprocedural Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: eugeni.stepanov at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17756
  --> https://llvm.org/bugs/attachment.cgi?id=17756&action=edit
unminimized test case

http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-autoconf/builds/2442

with r289696 one particularly hot function in the tsan runtime library has 6
spills instead of 5.

Test case (2.ii attached):
clang++ -std=c++11 -fPIE -O3 -o 1.o -c 2.ii && objdump -drl 1.o | grep -A 10
'__tsan_read1>:'

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