[llvm-bugs] [Bug 25981] New: -O3 on AMD Phenom causes long compilation time

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Thu Dec 31 01:36:19 PST 2015


            Bug ID: 25981
           Summary: -O3 on AMD Phenom causes long compilation time
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dcb314 at hotmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15538
  --> https://llvm.org/bugs/attachment.cgi?id=15538&action=edit
C source code

The attached file, when compiled with clang trunk revision 256486,
fails to compile in 20 minutes CPU time on a 3.5GHz AMD Phenom.

-O2 takes 2.4 seconds.

clang version 3.8 with -O3 takes 1.8 seconds.

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