From 98ded765c2dc2f256e9f11502ca302f2b24f31e8 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 8 Mar 2007 01:25:25 +0000
Subject: [PATCH] For Darwin, put constant data into .const, .const_data,
 .literal{4|8|16} sections.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35017 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMAsmPrinter.cpp        | 25 ++++++++++++++++++++++--
 lib/Target/ARM/ARMTargetAsmInfo.cpp     |  3 +++
 lib/Target/PowerPC/PPCAsmPrinter.cpp    | 26 +++++++++++++++++++++++--
 lib/Target/PowerPC/PPCTargetAsmInfo.cpp |  3 +++
 4 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
index 4654ef4d3e1..fc65144f57e 100644
--- a/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -743,7 +743,8 @@ bool ARMAsmPrinter::doFinalization(Module &M) {
 
     std::string name = Mang->getValueName(I);
     Constant *C = I->getInitializer();
-    unsigned Size = TD->getTypeSize(C->getType());
+    const Type *Type = C->getType();
+    unsigned Size = TD->getTypeSize(Type);
     unsigned Align = TD->getPreferredAlignmentLog(I);
 
     if (I->hasHiddenVisibility())
@@ -829,8 +830,28 @@ bool ARMAsmPrinter::doFinalization(Module &M) {
       } else {
         if (C->isNullValue() && !NoZerosInBSS && TAI->getBSSSection())
           SwitchToDataSection(TAI->getBSSSection(), I);
-        else
+        else if (!I->isConstant())
           SwitchToDataSection(TAI->getDataSection(), I);
+        else {
+          // Read-only data.
+          bool isIntFPLiteral = Type->isInteger()  || Type->isFloatingPoint();
+          if (C->ContainsRelocations() && Subtarget->isTargetDarwin() &&
+              TM.getRelocationModel() != Reloc::Static)
+            SwitchToDataSection("\t.const_data\n");
+          else if (isIntFPLiteral && Size == 4 &&
+                   TAI->getFourByteConstantSection())
+            SwitchToDataSection(TAI->getFourByteConstantSection(), I);
+          else if (isIntFPLiteral && Size == 8 &&
+                   TAI->getEightByteConstantSection())
+            SwitchToDataSection(TAI->getEightByteConstantSection(), I);
+          else if (isIntFPLiteral && Size == 16 &&
+                   TAI->getSixteenByteConstantSection())
+            SwitchToDataSection(TAI->getSixteenByteConstantSection(), I);
+          else if (TAI->getReadOnlySection())
+            SwitchToDataSection(TAI->getReadOnlySection(), I);
+          else
+            SwitchToDataSection(TAI->getDataSection(), I);
+        }
       }
 
       break;
diff --git a/lib/Target/ARM/ARMTargetAsmInfo.cpp b/lib/Target/ARM/ARMTargetAsmInfo.cpp
index ff6de2eee40..dfb78e8db9a 100644
--- a/lib/Target/ARM/ARMTargetAsmInfo.cpp
+++ b/lib/Target/ARM/ARMTargetAsmInfo.cpp
@@ -27,6 +27,9 @@ ARMTargetAsmInfo::ARMTargetAsmInfo(const ARMTargetMachine &TM) {
     HiddenDirective = "\t.private_extern\t";
     JumpTableDataSection = ".const";
     CStringSection = "\t.cstring";
+    FourByteConstantSection = "\t.literal4\n";
+    EightByteConstantSection = "\t.literal8\n";
+    ReadOnlySection = "\t.const\n";
     HasDotTypeDotSizeDirective = false;
     if (TM.getRelocationModel() == Reloc::Static) {
       StaticCtorsSection = ".constructor";
diff --git a/lib/Target/PowerPC/PPCAsmPrinter.cpp b/lib/Target/PowerPC/PPCAsmPrinter.cpp
index f6b5d483e36..e16303e888d 100644
--- a/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -893,7 +893,8 @@ bool DarwinAsmPrinter::doFinalization(Module &M) {
         O << Directive << name << "\n";
     
     Constant *C = I->getInitializer();
-    unsigned Size = TD->getTypeSize(C->getType());
+    const Type *Type = C->getType();
+    unsigned Size = TD->getTypeSize(Type);
     unsigned Align = TD->getPreferredAlignmentLog(I);
 
     if (C->isNullValue() && /* FIXME: Verify correct */
@@ -937,7 +938,28 @@ bool DarwinAsmPrinter::doFinalization(Module &M) {
           }
         }
 
-        SwitchToDataSection("\t.data", I);
+        if (!I->isConstant())
+          SwitchToDataSection(TAI->getDataSection(), I);
+        else {
+          // Read-only data.
+          bool isIntFPLiteral = Type->isInteger()  || Type->isFloatingPoint();
+          if (C->ContainsRelocations() &&
+              TM.getRelocationModel() != Reloc::Static)
+            SwitchToDataSection("\t.const_data\n");
+          else if (isIntFPLiteral && Size == 4 &&
+                   TAI->getFourByteConstantSection())
+            SwitchToDataSection(TAI->getFourByteConstantSection(), I);
+          else if (isIntFPLiteral && Size == 8 &&
+                   TAI->getEightByteConstantSection())
+            SwitchToDataSection(TAI->getEightByteConstantSection(), I);
+          else if (isIntFPLiteral && Size == 16 &&
+                   TAI->getSixteenByteConstantSection())
+            SwitchToDataSection(TAI->getSixteenByteConstantSection(), I);
+          else if (TAI->getReadOnlySection())
+            SwitchToDataSection(TAI->getReadOnlySection(), I);
+          else
+            SwitchToDataSection(TAI->getDataSection(), I);
+        }
         break;
       default:
         cerr << "Unknown linkage type!";
diff --git a/lib/Target/PowerPC/PPCTargetAsmInfo.cpp b/lib/Target/PowerPC/PPCTargetAsmInfo.cpp
index bdda9909f4a..01c78b71efa 100644
--- a/lib/Target/PowerPC/PPCTargetAsmInfo.cpp
+++ b/lib/Target/PowerPC/PPCTargetAsmInfo.cpp
@@ -57,6 +57,9 @@ DarwinTargetAsmInfo::DarwinTargetAsmInfo(const PPCTargetMachine &TM)
   JumpTableDataSection = ".const";
   GlobalDirective = "\t.globl\t";
   CStringSection = "\t.cstring";
+  FourByteConstantSection = "\t.literal4\n";
+  EightByteConstantSection = "\t.literal8\n";
+  ReadOnlySection = "\t.const\n";
   if (TM.getRelocationModel() == Reloc::Static) {
     StaticCtorsSection = ".constructor";
     StaticDtorsSection = ".destructor";