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<p style="margin-top:0;margin-bottom:0">Thank you! This solved my issue!</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Craig Topper <craig.topper@gmail.com><br>
<b>Sent:</b> 04 December 2017 17:46:01<br>
<b>To:</b> Kyriakos Georgiou<br>
<b>Cc:</b> cfe-dev@lists.llvm.org<br>
<b>Subject:</b> Re: [cfe-dev] Opt seems to report fewer stats when splitting the compilation to the several stages, rather than using clang</font>
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<div dir="auto">You need to invoke clang with -O2 -Xclang -disable-llvm-optzns instead of -O0</div>
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<div dir="auto">-O0 implies to clang to mark all functions as optnone in the generated IR</div>
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<div>On Mon, Dec 4, 2017 at 4:31 AM Kyriakos Georgiou via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>> wrote:<br>
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<p style="margin-top:0px; margin-bottom:0px"><span style="font-size:12pt">Hi,</span><font color="#333333" face="Segoe UI WestEuropean, Segoe UI, -apple-system, BlinkMacSystemFont, Roboto, Helvetica Neue, sans-serif"><span style="font-size:17px; white-space:nowrap"></span></font></p>
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I am trying to recreate the compilation of using clang and -O2 by splitting the compilation to the several stages using the several llvm tools (clang as front-end, opt, llc..) but the optimiser seems to behave differently if called individually than when called
by clang. I am using the latest llvm version. So I am calling the front end using:</p>
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<div>clang -mllvm -stats -mllvm -debug-pass=Structure -target arm-none-eabi -isystem /usr/local/lpcxpresso_8.2.2_650/lpcxpresso/tools/arm-none-eabi/include -DHAVE_CONFIG_H -I. -I../.. -Wall -I ../../i^Clude -I ../../config/arm/boards/lpcxpresso_1769_xpresso/
-I ../../config/arm/chips/lpc175x_6x/ "-DCALIB_SCALE=0" --static -mthumb -mcpu=cortex-m3 -D__USE_LPCOPEN -D__CODE_RED -D__REDLIB__ -DCHIP_LPC175X_6X -DCORE_M3 -ffunction-sections -fdata-sections -O2 -c -emit-llvm -o adpcm_optimized.bc adpcm.c</div>
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this also gives me the optimizer statistics and the structure of calling the passes.</div>
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then I am using </div>
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<div>clang -mllvm -stats -mllvm -debug-pass=Structure -target arm-none-eabi -isystem /usr/local/lpcxpresso_8.2.2_650/lpcxpresso/tools/arm-none-eabi/include -DHAVE_CONFIG_H -I. -I../.. -Wall -I ../../i^Clude -I ../../config/arm/boards/lpcxpresso_1769_xpresso/
-I ../../config/arm/chips/lpc175x_6x/ "-DCALIB_SCALE=0" --static -mthumb -mcpu=cortex-m3 -D__USE_LPCOPEN -D__CODE_RED -D__REDLIB__ -DCHIP_LPC175X_6X -DCORE_M3 -ffunction-sections -fdata-sections -O0 -c -emit-llvm -o adpcm_no_opt.bc adpcm.c</div>
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<div>and then</div>
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<div><span>opt -stats -O2 -S -debug-pass=Structure adpcm<span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px">_no_opt</span>.bc -o
adpcm.ll</span><br>
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<span style="font-size:12pt">I was expecting the stats coming out of the opt call to be the same as calling clang with -O2. Instead they are very little:
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<div> 18 basicaa - Number of times a GEP is decomposed</div>
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<div> 1 cgscc-passmgr - Maximum CGSCCPassMgr iterations on one SCC</div>
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<div>104 globalopt - Number of globals marked unnamed_addr</div>
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<div> 6 globalsmodref-aa - Number of global vars without address taken</div>
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Am I doing something wrong or missing something? The Structure of calling the passes is still the same, and also the emitted code from the clang with -O2 and the opt with -O2 seems to be the same. So why is the optimiser called individually not reporting
the full stats?</p>
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Thank you,</p>
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Kyriakos<br>
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<div dir="ltr">-- <br>
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<div class="x_gmail_signature">~Craig</div>
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