[llvm-bugs] [Bug 27097] New: Non-determinism when freeing passes

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https://llvm.org/bugs/show_bug.cgi?id=27097

            Bug ID: 27097
           Summary: Non-determinism when freeing passes
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Core LLVM classes
          Assignee: unassignedbugs at nondot.org
          Reporter: hxy9243 at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The output from -debug-pass=Executions provides non-deterministic order when
freeing passes.

Following is the invoking commandline. It's tested on trunk version of LLVM as
of 03/28/2016.


CC=$PATH_TO_CLANG
diff -u <($CC -O3 -mllvm -debug-pass=Executions hello.c 2>&1 | cut -d' ' -f4- )
<($CC -O3 -mllvm -debug-pass=Executions hello.c 2>&1 | cut -d' ' -f4-)

Example output:

--- /proc/self/fd/14    2016-03-28 12:13:01.815417440 -0500
+++ /proc/self/fd/15    2016-03-28 12:13:01.815417440 -0500
@@ -487,8 +487,8 @@
     Executing Pass 'Loop-Closed SSA Form Pass' on Function 'main'...
     Executing Pass 'Scalar Evolution Analysis' on Function 'main'...
     Executing Pass 'Loop Pass Manager' on Function 'main'...
-     Freeing Pass 'Function Alias Analysis Results' on Function 'main'...
      Freeing Pass 'Canonicalize natural loops' on Function 'main'...
+     Freeing Pass 'Function Alias Analysis Results' on Function 'main'...
      Freeing Pass 'Loop-Closed SSA Form Pass' on Function 'main'...
     Executing Pass 'Alignment from assumptions' on Function 'main'...
      Freeing Pass 'Scalar Evolution Analysis' on Function 'main'...

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