commit 99b3e022c47b681b6c14f0a047d6dd64e232da4b
author Chad Rosier <mcrosier@codeaurora.org> Fri Mar 06 16:15:04 2015 +0000
committer Chad Rosier <mcrosier@codeaurora.org> Fri Mar 06 16:15:04 2015 +0000
tree 6daa2e112543f530885594e1242ccffa28c2357f
parent dcc78ec386d4d83293da2ecd23ca85395655e3a7

Avoid calls to dumpPassInfo and RegionBase<Tr>::getNameStr() in RGPassManager if
-debug-pass is not specified, as the string is only used when dumping pass
information.  There is a big cost of determining the name in
ReginBase<Tr>:getNameStr() if the region's entry or exit block doesn't have a
name.  This is the case for the Release build, as names are not preserved by the
front-end.

RegionPass is mainly used by Polly, resulting in long compile time for one file
of a customer application with the Release build (1m24s) vs Release+Asserts
build (10s) when Polly is used.  With this change, the compile time with the
Release build went down to 8s.

Patch by Sanjin Sijaric <ssijaric@codeaurora.org>!
Phabricator: http://reviews.llvm.org/D8076

llvm-svn: 231485

llvm/lib/Analysis/RegionPass.cpp

diff --git a/llvm/lib/Analysis/RegionPass.cpp b/llvm/lib/Analysis/RegionPass.cpp
index 6fa7b2e..956b12b 100644
--- a/llvm/lib/Analysis/RegionPass.cpp
+++ b/llvm/lib/Analysis/RegionPass.cpp
@@ -83,9 +83,11 @@
     for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
       RegionPass *P = (RegionPass*)getContainedPass(Index);
 
-      dumpPassInfo(P, EXECUTION_MSG, ON_REGION_MSG,
-                   CurrentRegion->getNameStr());
-      dumpRequiredSet(P);
+      if (isPassDebuggingExecutionsOrMore()) {
+        dumpPassInfo(P, EXECUTION_MSG, ON_REGION_MSG,
+                     CurrentRegion->getNameStr());
+        dumpRequiredSet(P);
+      }
 
       initializeAnalysisImpl(P);
 
@@ -96,11 +98,13 @@
         Changed |= P->runOnRegion(CurrentRegion, *this);
       }
 
-      if (Changed)
-        dumpPassInfo(P, MODIFICATION_MSG, ON_REGION_MSG,
-                     skipThisRegion ? "<deleted>" :
-                                    CurrentRegion->getNameStr());
-      dumpPreservedSet(P);
+      if (isPassDebuggingExecutionsOrMore()) {
+        if (Changed)
+          dumpPassInfo(P, MODIFICATION_MSG, ON_REGION_MSG,
+                       skipThisRegion ? "<deleted>" :
+                                      CurrentRegion->getNameStr());
+        dumpPreservedSet(P);
+      }
 
       if (!skipThisRegion) {
         // Manually check that this region is still healthy. This is done
@@ -120,8 +124,8 @@
       removeNotPreservedAnalysis(P);
       recordAvailableAnalysis(P);
       removeDeadPasses(P,
-                       skipThisRegion ? "<deleted>" :
-                                      CurrentRegion->getNameStr(),
+                       (!isPassDebuggingExecutionsOrMore() || skipThisRegion) ?
+                       "<deleted>" :  CurrentRegion->getNameStr(),
                        ON_REGION_MSG);
 
       if (skipThisRegion)