From: Chad Rosier <mcrosier@codeaurora.org>
Date: Tue, 29 Dec 2015 18:18:07 +0000 (+0000)
Subject: Add command line options to force function/loop alignments.
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=8b2e79cb091f956da7d26f791daf2bf85f7b0867

Add command line options to force function/loop alignments.

These are being added for testing purposes.
http://reviews.llvm.org/D15648

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256571 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/MachineBlockPlacement.cpp b/lib/CodeGen/MachineBlockPlacement.cpp
index fcddf346cf6..f5e30564501 100644
--- a/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/lib/CodeGen/MachineBlockPlacement.cpp
@@ -62,6 +62,11 @@ static cl::opt<unsigned> AlignAllBlock("align-all-blocks",
                                                 "blocks in the function."),
                                        cl::init(0), cl::Hidden);
 
+static cl::opt<unsigned>
+    AlignAllLoops("align-all-loops",
+                  cl::desc("Force the alignment of all loops in the function."),
+                  cl::init(0), cl::Hidden);
+
 // FIXME: Find a good default for this flag and remove the flag.
 static cl::opt<unsigned> ExitBlockBias(
     "block-placement-exit-block-bias",
@@ -1329,6 +1334,11 @@ void MachineBlockPlacement::buildCFGChains(MachineFunction &F) {
     if (!L)
       continue;
 
+    if (AlignAllLoops) {
+      ChainBB->setAlignment(AlignAllLoops);
+      continue;
+    }
+
     unsigned Align = TLI->getPrefLoopAlignment(L);
     if (!Align)
       continue; // Don't care about loop alignment.
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index 80d30a5b131..ca4bb1c6ad4 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -47,6 +47,11 @@ using namespace llvm;
 
 #define DEBUG_TYPE "codegen"
 
+static cl::opt<unsigned>
+    AlignAllFunctions("align-all-functions",
+                      cl::desc("Force the alignment of all functions."),
+                      cl::init(0), cl::Hidden);
+
 void MachineFunctionInitializer::anchor() {}
 
 //===----------------------------------------------------------------------===//
@@ -87,6 +92,9 @@ MachineFunction::MachineFunction(const Function *F, const TargetMachine &TM,
     Alignment = std::max(Alignment,
                          STI->getTargetLowering()->getPrefFunctionAlignment());
 
+  if (AlignAllFunctions)
+    Alignment = AlignAllFunctions;
+
   FunctionNumber = FunctionNum;
   JumpTableInfo = nullptr;