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<div class="moz-cite-prefix">On 08/15/2018 09:28 AM, Jonas Paulsson
via llvm-dev wrote:<br>
</div>
<blockquote type="cite"
cite="mid:388b9f97-9038-e0e5-e464-c129907b9602@linux.vnet.ibm.com">
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<p><br>
</p>
Hi Eli,<br>
<br>
<div class="moz-cite-prefix">On 2018-08-14 20:03, Friedman, Eli
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:81bc4b4e-3a90-01b4-c736-3abe51dd4dc4@codeaurora.org">On
8/14/2018 6:57 AM, Jonas Paulsson via llvm-dev wrote: <br>
<blockquote type="cite">Hi, <br>
<br>
I am trying to compare the loop vectorizers effectiveness for
different targets relative to each other. That way, I am
hoping to find loops that are not vectorized - but could be -
on my target by finding other targets doing this successfully.
With some luck, there might be something in the Target files
that could be fixed with improved vectorization as a result...
<br>
<br>
I would like to do this with the optimization remarks enabled:
-Rpass=loop-vectorize, etc. Since cross-compiling benchmarks
seems tricky to me at the moment, my idea was to first run the
front end, and then run the optimizers for different targets.
However, when I pass -save-temps to clang there are no remarks
emitted at all any more... So in effect I can only get the
remarks for the target I am on :-/ <br>
<br>
I wonder if there is a reason for this, or if it's something
that could be fixed? <br>
<br>
</blockquote>
<br>
I think it's just a bug; if you pass -### to clang, you can see
how -save-temps actually invokes clang four times, and -Rpass
only gets passed to the first invocation. <br>
<br>
</blockquote>
<br>
Strange - I see -Rpass in all the invocations... It just doesn't
seem to have any effect with -save-temps... Am I doing something
wrong?<br>
</blockquote>
<br>
I don't think so. I ran into this a couple of weeks ago myself, and
then forgot to file a bug report.<br>
<br>
-Hal<br>
<br>
<blockquote type="cite"
cite="mid:388b9f97-9038-e0e5-e464-c129907b9602@linux.vnet.ibm.com">
<br>
<br>
<tt>"/home/ijonpan/llvm/build/llvm-dev-2/bin/clang" -c -o toke.o
-DSPEC_CPU -DNDEBUG -DPERL_CORE -O3 -march=z14 -DSPEC_CPU
-DNDEBUG -DPERL_CORE -DSPEC_CPU_LINUX -DSPEC_CPU_BIGENDIAN
-D_GNU_SOURCE -DSPEC_CPU_LP64 -fno-strict-aliasing
-std=gnu90 toke.c -Rpass=loop-vectorize -save-temps -###
</tt><tt><br>
</tt><tt>clang version 8.0.0 (<a class="moz-txt-link-freetext"
href="https://git.llvm.org/git/clang.git/"
moz-do-not-send="true">https://git.llvm.org/git/clang.git/</a>
731b1c80ca380ee4d0e68704f8185bb523ce7b23) (<a
class="moz-txt-link-freetext"
href="https://git.llvm.org/git/llvm.git/"
moz-do-not-send="true">https://git.llvm.org/git/llvm.git/</a>
a3a6a7d1b9744ce5ad40394792adc25e63bc9904)</tt><tt><br>
</tt><tt>Target: s390x-ibm-linux</tt><tt><br>
</tt><tt>Thread model: posix</tt><tt><br>
</tt><tt>InstalledDir: /home/ijonpan/llvm/build/llvm-dev-2/bin</tt><tt><br>
</tt><tt> "/home/ijonpan/llvm/build/llvm-dev-2/bin/clang-8" "-cc1"
"-triple" "s390x-ibm-linux" "-E" "-save-temps=cwd"
"-disable-free" "-main-file-name" "toke.c" "-mrelocation-model"
"static" "-mthread-model" "posix" "-relaxed-aliasing"
"-fmath-errno" "-masm-verbose" "-mconstructor-aliases"
"-fuse-init-array" "-target-cpu" "z14" "-dwarf-column-info"
"-debugger-tuning=gdb" "-momit-leaf-frame-pointer"
"-coverage-notes-file"
"/home/ijonpan/minispec-2006/spec-llvm/400.perlbench/build/toke.gcno"
"-resource-dir"
"/home/ijonpan/llvm/build/llvm-dev-2/lib/clang/8.0.0" "-D"
"SPEC_CPU" "-D" "NDEBUG" "-D" "PERL_CORE" "-D" "SPEC_CPU" "-D"
"NDEBUG" "-D" "PERL_CORE" "-D" "SPEC_CPU_LINUX" "-D"
"SPEC_CPU_BIGENDIAN" "-D" "_GNU_SOURCE" "-D" "SPEC_CPU_LP64"
"-internal-isystem" "/usr/local/include" "-internal-isystem"
"/home/ijonpan/llvm/build/llvm-dev-2/lib/clang/8.0.0/include"
"-internal-externc-isystem" "/include"
"-internal-externc-isystem" "/usr/include" "-O3" <b>"-Rpass=loop-vectorize"</b>
"-std=gnu90" "-fdebug-compilation-dir"
"/home/ijonpan/minispec-2006/spec-llvm/400.perlbench/build"
"-ferror-limit" "19" "-fmessage-length" "225" "-fno-signed-char"
"-fobjc-runtime=gcc" "-fdiagnostics-show-option"
"-fcolor-diagnostics" "-vectorize-loops" "-vectorize-slp" "-o"
"toke.i" "-x" "c" "toke.c" "-faddrsig"</tt><tt><br>
</tt><tt> "/home/ijonpan/llvm/build/llvm-dev-2/bin/clang-8" "-cc1"
"-triple" "s390x-ibm-linux" "-emit-llvm-bc"
"-emit-llvm-uselists" "-save-temps=cwd" "-disable-free"
"-main-file-name" "toke.c" "-mrelocation-model" "static"
"-mthread-model" "posix" "-relaxed-aliasing" "-fmath-errno"
"-masm-verbose" "-mconstructor-aliases" "-fuse-init-array"
"-target-cpu" "z14" "-dwarf-column-info" "-debugger-tuning=gdb"
"-momit-leaf-frame-pointer" "-coverage-notes-file"
"/home/ijonpan/minispec-2006/spec-llvm/400.perlbench/build/toke.gcno"
"-resource-dir"
"/home/ijonpan/llvm/build/llvm-dev-2/lib/clang/8.0.0" "-O3" <b>"-Rpass=loop-vectorize"</b>
"-std=gnu90" "-fdebug-compilation-dir"
"/home/ijonpan/minispec-2006/spec-llvm/400.perlbench/build"
"-ferror-limit" "19" "-fmessage-length" "225" "-fno-signed-char"
"-fobjc-runtime=gcc" "-fdiagnostics-show-option"
"-fcolor-diagnostics" "-vectorize-loops" "-vectorize-slp"
"-disable-llvm-passes" "-o" "toke.bc" "-x" "cpp-output" "toke.i"
"-faddrsig"</tt><tt><br>
</tt><tt> "/home/ijonpan/llvm/build/llvm-dev-2/bin/clang-8" "-cc1"
"-triple" "s390x-ibm-linux" "-S" "-save-temps=cwd"
"-disable-free" "-main-file-name" "toke.c" "-mrelocation-model"
"static" "-mthread-model" "posix" "-relaxed-aliasing"
"-fmath-errno" "-masm-verbose" "-mconstructor-aliases"
"-fuse-init-array" "-target-cpu" "z14" "-dwarf-column-info"
"-debugger-tuning=gdb" "-momit-leaf-frame-pointer"
"-coverage-notes-file"
"/home/ijonpan/minispec-2006/spec-llvm/400.perlbench/build/toke.gcno"
"-resource-dir"
"/home/ijonpan/llvm/build/llvm-dev-2/lib/clang/8.0.0" "-O3" <b>"-Rpass=loop-vectorize"</b>
"-std=gnu90" "-fdebug-compilation-dir"
"/home/ijonpan/minispec-2006/spec-llvm/400.perlbench/build"
"-ferror-limit" "19" "-fmessage-length" "225" "-fno-signed-char"
"-fobjc-runtime=gcc" "-fdiagnostics-show-option"
"-fcolor-diagnostics" "-vectorize-loops" "-vectorize-slp" "-o"
"toke.s" "-x" "ir" "toke.bc" "-faddrsig"</tt><tt><br>
</tt><tt> "/home/ijonpan/llvm/build/llvm-dev-2/bin/clang-8"
"-cc1as" "-triple" "s390x-ibm-linux" "-filetype" "obj"
"-main-file-name" "toke.c" "-target-cpu" "z14"
"-dwarf-version=4" "-mrelocation-model" "static" "-o" "toke.o"
"toke.s"</tt><tt><br>
</tt><br>
<tt><br>
<br>
</tt><tt>"/home/ijonpan/llvm/build/llvm-dev-2/bin/clang" -c -o
toke.o -DSPEC_CPU -DNDEBUG -DPERL_CORE -O3 -march=z14
-DSPEC_CPU -DNDEBUG -DPERL_CORE -DSPEC_CPU_LINUX
-DSPEC_CPU_BIGENDIAN -D_GNU_SOURCE -DSPEC_CPU_LP64
-fno-strict-aliasing -std=gnu90 toke.c
-Rpass=loop-vectorize </tt><tt><br>
</tt><tt>toke.c:1483:4: remark: vectorized loop (vectorization
width: 4, interleaved count: 1) [-Rpass=loop-vectorize]</tt><tt><br>
</tt><tt> for (c = (U8 *) SvPVX(sv); c <
(U8 *)d; c++) {</tt><tt><br>
</tt><tt> ^</tt><tt><br>
</tt><tt>toke.c:1291:7: remark: vectorized loop (vectorization
width: 16, interleaved count: 1) [-Rpass=loop-vectorize]</tt><tt><br>
</tt><tt> for (i = min; i <= max; i++)</tt><tt><br>
</tt><tt> ^</tt><tt><br>
</tt><tt>toke.c:1345:3: remark: vectorized loop (vectorization
width: 16, interleaved count: 1) [-Rpass=loop-vectorize]</tt><tt><br>
</tt><tt> while (s < regparse)</tt><tt><br>
</tt><tt><br>
<br>
</tt><tt><br>
</tt><tt>"/home/ijonpan/llvm/build/llvm-dev-2/bin/clang" -c -o
toke.o -DSPEC_CPU -DNDEBUG -DPERL_CORE -O3 -march=z14
-DSPEC_CPU -DNDEBUG -DPERL_CORE -DSPEC_CPU_LINUX
-DSPEC_CPU_BIGENDIAN -D_GNU_SOURCE -DSPEC_CPU_LP64
-fno-strict-aliasing -std=gnu90 toke.c
-Rpass=loop-vectorize -save-temps</tt><tt><br>
</tt><tt>(no output)</tt><br>
<br>
<br>
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</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
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