From d2e7196d0a1b33b16b4693a3278ca2f580bf0f0e Mon Sep 17 00:00:00 2001
From: Davide Italiano <davide@freebsd.org>
Date: Fri, 17 Jun 2016 18:07:14 +0000
Subject: [PATCH] [Codegen] Change PICLevel.

We convert `Default` to `NotPIC` so that target independent code
can reason about this correctly.

Differential Revision:  http://reviews.llvm.org/D21394

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273024 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Support/CodeGen.h         | 3 ++-
 lib/IR/Module.cpp                      | 2 +-
 lib/Target/PowerPC/PPCAsmPrinter.cpp   | 6 +++---
 lib/Target/PowerPC/PPCISelDAGToDAG.cpp | 2 +-
 lib/Target/PowerPC/PPCISelLowering.cpp | 4 ++--
 5 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/include/llvm/Support/CodeGen.h b/include/llvm/Support/CodeGen.h
index 554c900e3bb..e19abf8271e 100644
--- a/include/llvm/Support/CodeGen.h
+++ b/include/llvm/Support/CodeGen.h
@@ -29,7 +29,8 @@ namespace llvm {
   }
 
   namespace PICLevel {
-    enum Level { Default=0, Small=1, Large=2 };
+    // This is used to map -fpic/-fPIC.
+    enum Level { NotPIC=0, SmallPIC=1, BigPIC=2 };
   }
 
   namespace PIELevel {
diff --git a/lib/IR/Module.cpp b/lib/IR/Module.cpp
index b15cac40274..f229e2b3702 100644
--- a/lib/IR/Module.cpp
+++ b/lib/IR/Module.cpp
@@ -487,7 +487,7 @@ PICLevel::Level Module::getPICLevel() const {
   auto *Val = cast_or_null<ConstantAsMetadata>(getModuleFlag("PIC Level"));
 
   if (!Val)
-    return PICLevel::Default;
+    return PICLevel::NotPIC;
 
   return static_cast<PICLevel::Level>(
       cast<ConstantInt>(Val->getValue())->getZExtValue());
diff --git a/lib/Target/PowerPC/PPCAsmPrinter.cpp b/lib/Target/PowerPC/PPCAsmPrinter.cpp
index bb1ab2e9889..b43f51df602 100644
--- a/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -601,7 +601,7 @@ void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
     else if (MO.isBlockAddress())
       MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
 
-    if (PL == PICLevel::Small) {
+    if (PL == PICLevel::SmallPIC) {
       const MCExpr *Exp =
         MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_GOT,
                                 OutContext);
@@ -1045,7 +1045,7 @@ void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
       TM.getRelocationModel() != Reloc::PIC_)
     return AsmPrinter::EmitStartOfAsmFile(M);
 
-  if (M.getPICLevel() == PICLevel::Small)
+  if (M.getPICLevel() == PICLevel::SmallPIC)
     return AsmPrinter::EmitStartOfAsmFile(M);
 
   OutStreamer->SwitchSection(OutContext.getELFSection(
@@ -1072,7 +1072,7 @@ void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
   // linux/ppc32 - Normal entry label.
   if (!Subtarget->isPPC64() &&
       (TM.getRelocationModel() != Reloc::PIC_ ||
-       MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
+       MF->getFunction()->getParent()->getPICLevel() == PICLevel::SmallPIC))
     return AsmPrinter::EmitFunctionEntryLabel();
 
   if (!Subtarget->isPPC64()) {
diff --git a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index eeb5a07c251..0e9b2daa0cb 100644
--- a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -319,7 +319,7 @@ SDNode *PPCDAGToDAGISel::getGlobalBaseReg() {
     if (PPCLowering->getPointerTy(CurDAG->getDataLayout()) == MVT::i32) {
       if (PPCSubTarget->isTargetELF()) {
         GlobalBaseReg = PPC::R30;
-        if (M->getPICLevel() == PICLevel::Small) {
+        if (M->getPICLevel() == PICLevel::SmallPIC) {
           BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MoveGOTtoLR));
           BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
           MF->getInfo<PPCFunctionInfo>()->setUsesPICBase(true);
diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index 31197fd8304..22ae871dc6b 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -2172,7 +2172,7 @@ SDValue PPCTargetLowering::LowerGlobalTLSAddress(SDValue Op,
       GOTPtr = DAG.getNode(PPCISD::ADDIS_TLSGD_HA, dl, PtrVT,
                                    GOTReg, TGA);
     } else {
-      if (picLevel == PICLevel::Small)
+      if (picLevel == PICLevel::SmallPIC)
         GOTPtr = DAG.getNode(PPCISD::GlobalBaseReg, dl, PtrVT);
       else
         GOTPtr = DAG.getNode(PPCISD::PPC32_PICGOT, dl, PtrVT);
@@ -2190,7 +2190,7 @@ SDValue PPCTargetLowering::LowerGlobalTLSAddress(SDValue Op,
       GOTPtr = DAG.getNode(PPCISD::ADDIS_TLSLD_HA, dl, PtrVT,
                            GOTReg, TGA);
     } else {
-      if (picLevel == PICLevel::Small)
+      if (picLevel == PICLevel::SmallPIC)
         GOTPtr = DAG.getNode(PPCISD::GlobalBaseReg, dl, PtrVT);
       else
         GOTPtr = DAG.getNode(PPCISD::PPC32_PICGOT, dl, PtrVT);