[llvm] r358641 - Elaborate why we have an option on by default for enabling chr.

[Eric Christopher via llvm-commits]

Author: echristo
Date: Wed Apr 17 23:17:40 2019
New Revision: 358641

URL: http://llvm.org/viewvc/llvm-project?rev=358641&view=rev
Log:
Elaborate why we have an option on by default for enabling chr.

Modified:
    llvm/trunk/lib/Passes/PassBuilder.cpp
    llvm/trunk/lib/Transforms/IPO/PassManagerBuilder.cpp

Modified: llvm/trunk/lib/Passes/PassBuilder.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Passes/PassBuilder.cpp?rev=358641&r1=358640&r2=358641&view=diff
==============================================================================
--- llvm/trunk/lib/Passes/PassBuilder.cpp (original)
+++ llvm/trunk/lib/Passes/PassBuilder.cpp Wed Apr 17 23:17:40 2019
@@ -209,6 +209,8 @@ static cl::opt<bool> EnableSyntheticCoun
 static Regex DefaultAliasRegex(
     "^(default|thinlto-pre-link|thinlto|lto-pre-link|lto)<(O[0123sz])>$");
 
+// This option is used in simplifying testing SampleFDO optimizations for
+// profile loading.
 static cl::opt<bool>
     EnableCHR("enable-chr-npm", cl::init(true), cl::Hidden,
               cl::desc("Enable control height reduction optimization (CHR)"));

Modified: llvm/trunk/lib/Transforms/IPO/PassManagerBuilder.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/IPO/PassManagerBuilder.cpp?rev=358641&r1=358640&r2=358641&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/IPO/PassManagerBuilder.cpp (original)
+++ llvm/trunk/lib/Transforms/IPO/PassManagerBuilder.cpp Wed Apr 17 23:17:40 2019
@@ -139,6 +139,8 @@ static cl::opt<bool> EnableGVNSink(
     "enable-gvn-sink", cl::init(false), cl::Hidden,
     cl::desc("Enable the GVN sinking pass (default = off)"));
 
+// This option is used in simplifying testing SampleFDO optimizations for
+// profile loading.
 static cl::opt<bool>
     EnableCHR("enable-chr", cl::init(true), cl::Hidden,
               cl::desc("Enable control height reduction optimization (CHR)"));