[LLVMbugs] [Bug 16193] New: Turning on gcc's optimizations halves the run-time of the gas_dyn and induct polyhedron benchmarks

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16193

            Bug ID: 16193
           Summary: Turning on gcc's optimizations halves the run-time of
                    the gas_dyn and induct polyhedron benchmarks
           Product: dragonegg
           Version: 3.2
          Hardware: PC
                OS: Linux
            Status: ASSIGNED
          Severity: normal
          Priority: P
         Component: New Bugs
          Assignee: baldrick at free.fr
          Reporter: baldrick at free.fr
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

gcc-4.8 + LLVM 3.3 dragonegg plugin, -ffast-math -funroll-loops -O3,
x86_apple-darwin12, numbers by Jack Howarth.

gas_dyn runtimes:

LLVM optimizations only: 7.94
LLVM+GCC optimizations: 4.20
Just GCC, no LLVM: 3.59


induct runtimes:

LLVM optimizations only: 24.04
LLVM+GCC optimizations: 11.85
Just GCC, no LLVM: 12.21

The GCC mid-level optimizers are doing something good here, halving the
run-time.

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