From 1123135dbfa776bbe4c2120a16098d81e0850a76 Mon Sep 17 00:00:00 2001
From: Richard Osborne <richard@xmos.com>
Date: Tue, 18 Aug 2009 21:14:31 +0000
Subject: [PATCH] Add support for mergeable sections back into the XCore
 backend.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79368 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/XCore/XCoreTargetObjectFile.cpp | 23 +++++++++++++++++-----
 test/CodeGen/XCore/constants.ll            |  2 +-
 test/CodeGen/XCore/globals.ll              |  2 +-
 3 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/lib/Target/XCore/XCoreTargetObjectFile.cpp b/lib/Target/XCore/XCoreTargetObjectFile.cpp
index 91cb11533df..c1990d6d0fc 100644
--- a/lib/Target/XCore/XCoreTargetObjectFile.cpp
+++ b/lib/Target/XCore/XCoreTargetObjectFile.cpp
@@ -28,11 +28,24 @@ void XCoreTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM){
                            MCSectionXCore::SHF_DP_SECTION,
                            SectionKind::getBSS(), false, getContext());
   
-  // For now, disable lowering of mergable sections, just drop everything into
-  // ReadOnly.
-  MergeableConst4Section = 0;
-  MergeableConst8Section = 0;
-  MergeableConst16Section = 0;
+  MergeableConst4Section = 
+    MCSectionXCore::Create(".cp.rodata.cst4", MCSectionELF::SHT_PROGBITS,
+                           MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE |
+                           MCSectionXCore::SHF_CP_SECTION,
+                           SectionKind::getMergeableConst4(), false,
+                           getContext());
+  MergeableConst8Section = 
+    MCSectionXCore::Create(".cp.rodata.cst8", MCSectionELF::SHT_PROGBITS,
+                           MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE |
+                           MCSectionXCore::SHF_CP_SECTION,
+                           SectionKind::getMergeableConst8(), false,
+                           getContext());
+  MergeableConst16Section = 
+    MCSectionXCore::Create(".cp.rodata.cst16", MCSectionELF::SHT_PROGBITS,
+                           MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE |
+                           MCSectionXCore::SHF_CP_SECTION,
+                           SectionKind::getMergeableConst16(), false,
+                           getContext());
   
   // TLS globals are lowered in the backend to arrays indexed by the current
   // thread id. After lowering they require no special handling by the linker
diff --git a/test/CodeGen/XCore/constants.ll b/test/CodeGen/XCore/constants.ll
index 2aee6a26c4e..8ba8b5c6a76 100644
--- a/test/CodeGen/XCore/constants.ll
+++ b/test/CodeGen/XCore/constants.ll
@@ -1,6 +1,6 @@
 ; RUN: llvm-as < %s | llc -march=xcore -mcpu=xs1b-generic | FileCheck %s
 
-; CHECK: .section .cp.rodata,"ac",@progbits
+; CHECK: .section .cp.rodata.cst4,"aMc",@progbits,4
 ; CHECK: .LCPI1_0:
 ; CHECK: .long 12345678
 ; CHECK: f:
diff --git a/test/CodeGen/XCore/globals.ll b/test/CodeGen/XCore/globals.ll
index 8cb2ef36694..9bc0f53de71 100644
--- a/test/CodeGen/XCore/globals.ll
+++ b/test/CodeGen/XCore/globals.ll
@@ -68,7 +68,7 @@ entry:
 ; CHECK: G2:
 
 @G3 = constant i32 9401
-; CHECK: .section .cp.rodata,"ac",@progbits
+; CHECK: .section .cp.rodata.cst4,"aMc",@progbits,4
 ; CHECK: G3:
 
 @G4 = global i32* @G1
-- 
2.34.1