[PATCH] D62627: [NFC] Do not run CGProfilePass when -fno-integrated-as is on

Zhizhou Yang via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Wed May 29 13:56:39 PDT 2019

zhizhouy created this revision.
zhizhouy added reviewers: Bigcheese, xur, george.burgess.iv.
Herald added subscribers: llvm-commits, dexonsmith, hiraditya.
Herald added a project: LLVM.

CGProfilePass is run by default in certain new pass manager optimization pipeline. Assemblers other than llvm-as (such as gnu-as) cannot recognize the .cgprofile entries generated and emitted from this pass, causing build time error.

This patch adds a new opt option "enable-call-graph-profile-sort" (on by default) and we turn it off when "-fno-integrated-as" is specified in clang.

Since CGProfilePass only exists in new pass manager, it's a bit awkward that we will pass a nop -mllvm option if legacy pass manager is used.
-DENABLE_EXPERIMENTAL_NEW_PASS_MANAGER when building LLVM will be a good solution to make this consistent.
Further opinions are welcome.




Index: llvm/lib/Passes/PassBuilder.cpp
--- llvm/lib/Passes/PassBuilder.cpp
+++ llvm/lib/Passes/PassBuilder.cpp
@@ -212,6 +212,10 @@
     EnableCHR("enable-chr-npm", cl::init(true), cl::Hidden,
               cl::desc("Enable control height reduction optimization (CHR)"));
+static cl::opt<bool> EnableCallGraphProfileSort(
+    "enable-call-graph-profile-sort", cl::init(true), cl::Hidden,
+    cl::desc("Enable call graph profile pass for the new PM (default = on)"));
 extern cl::opt<bool> EnableHotColdSplit;
 extern cl::opt<bool> EnableOrderFileInstrumentation;
@@ -939,7 +943,8 @@
   // Add the core optimizing pipeline.
-  MPM.addPass(CGProfilePass());
+  if (EnableCallGraphProfileSort)
+    MPM.addPass(CGProfilePass());
   // Now we need to do some global optimization transforms.
   // FIXME: It would seem like these should come first in the optimization
Index: clang/lib/Driver/ToolChains/Clang.cpp
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -3995,8 +3995,13 @@
-  if (!TC.useIntegratedAs())
+  if (!TC.useIntegratedAs()) {
+    // .cgprofile can only be parsed by llvm-as, do not run CGProfilePass if
+    // integrated-as is not used.
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back("-enable-call-graph-profile-sort=false");
+  }
   if (Args.hasArg(options::OPT_fdebug_pass_structure)) {

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