[LLVMbugs] [Bug 15287] New: surfaceArea.cc from xplor-nih compiles ~30 times to slowly using -O1/-O2/-O3 -funroll-loops -fplugin-arg-dragonegg-llvm-option=-vectorize

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15287

            Bug ID: 15287
           Summary: surfaceArea.cc from xplor-nih compiles ~30 times to
                    slowly using -O1/-O2/-O3 -funroll-loops
                    -fplugin-arg-dragonegg-llvm-option=-vectorize
           Product: new-bugs
           Version: trunk
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: howarth at nitro.med.uc.edu
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The largest remaining vectorization bottleneck in compiling xplor-nih with
-fplugin-arg-dragonegg-llvm-option=-vectorize is in the compilation of
intVar/surfaceArea.cc...

% time de-g++47 -c surfaceArea.cc -O1 -funroll-loops
-fplugin-arg-dragonegg-llvm-option=-vectorize -DX_MMAP_FLAGS=0 -DFORTRAN_INIT
-fno-common -DDARWIN -D_REENTRANT -DNDEBUG
-I/Users/howarth/xplor-nih-2.33/nmrPot/
-I/Users/howarth/xplor-nih-2.33/arch/Darwin_12_x86_64/include
-I/Users/howarth/xplor-nih-2.33/CDSlib -I/Users/howarth/xplor-nih-2.33/common
-I/Users/howarth/xplor-nih-2.33/intVar -I/Users/howarth/xplor-nih-2.33/fortlib
-I/Users/howarth/xplor-nih-2.33/surfD -I/Users/howarth/xplor-nih-2.33
-DCPLUSPLUS -DUSE_CDS_NAMESPACE -I/Users/howarth/xplor-nih-2.33/nmrPot/
-I/Users/howarth/xplor-nih-2.33/arch/Darwin_12_x86_64/include
...
60.843u 0.130s 1:00.98 99.9%    0+0k 0+13io 0pf+0w

% time de-g++47 -c surfaceArea.cc -O1 -funroll-loops -DX_MMAP_FLAGS=0
-DFORTRAN_INIT -fno-common -DDARWIN -D_REENTRANT -DNDEBUG
-I/Users/howarth/xplor-nih-2.33/nmrPot/
-I/Users/howarth/xplor-nih-2.33/arch/Darwin_12_x86_64/include
-I/Users/howarth/xplor-nih-2.33/CDSlib -I/Users/howarth/xplor-nih-2.33/common
-I/Users/howarth/xplor-nih-2.33/intVar -I/Users/howarth/xplor-nih-2.33/fortlib
-I/Users/howarth/xplor-nih-2.33/surfD -I/Users/howarth/xplor-nih-2.33
-DCPLUSPLUS -DUSE_CDS_NAMESPACE -I/Users/howarth/xplor-nih-2.33/nmrPot/
-I/Users/howarth/xplor-nih-2.33/arch/Darwin_12_x86_64/include
...
2.091u 0.120s 0:02.21 100.0%    0+0k 0+3io 0pf+0w

The non-vectorized LLVM IR generated with...

de-g++47 -c surfaceArea.cc -O1 -funroll-loops -DX_MMAP_FLAGS=0 -DFORTRAN_INIT
-fno-common -DDARWIN -D_REENTRANT -DNDEBUG
-I/Users/howarth/xplor-nih-2.33/nmrPot/
-I/Users/howarth/xplor-nih-2.33/arch/Darwin_12_x86_64/include
-I/Users/howarth/xplor-nih-2.33/CDSlib -I/Users/howarth/xplor-nih-2.33/common
-I/Users/howarth/xplor-nih-2.33/intVar -I/Users/howarth/xplor-nih-2.33/fortlib
-I/Users/howarth/xplor-nih-2.33/surfD -I/Users/howarth/xplor-nih-2.33
-DCPLUSPLUS -DUSE_CDS_NAMESPACE -I/Users/howarth/xplor-nih-2.33/nmrPot/
-I/Users/howarth/xplor-nih-2.33/arch/Darwin_12_x86_64/include
-fplugin-arg-dragonegg-emit-ir -S

is attached as surfaceArea.s and can be used to reproduce this problem as
follows...

% time /sw/opt/llvm-3.3/bin/opt -O1 -vectorize surfaceArea.s
...
30.187u 0.048s 0:30.53 98.9%    0+0k 0+0io 950pf+0w

% time /sw/opt/llvm-3.3/bin/opt -O1  surfaceArea.s
...
0.621u 0.011s 0:00.63 100.0%    0+0k 0+0io 0pf+0w

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