From 3ee7d15284f188672e9e429e9e5cf7b870698677 Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Tue, 17 Jan 2012 23:09:00 +0000
Subject: [PATCH] Implement ARMBaseRegisterInfo::getCallPreservedMask().

Move ARM callee-saved lists into ARMCallingConv.td.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148357 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMBaseRegisterInfo.cpp | 24 +++++-------------------
 lib/Target/ARM/ARMBaseRegisterInfo.h   |  1 +
 lib/Target/ARM/ARMCallingConv.td       | 11 +++++++++++
 3 files changed, 17 insertions(+), 19 deletions(-)

diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.cpp b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
index ed7ac276efd..027c47e3ced 100644
--- a/lib/Target/ARM/ARMBaseRegisterInfo.cpp
+++ b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
@@ -63,26 +63,12 @@ ARMBaseRegisterInfo::ARMBaseRegisterInfo(const ARMBaseInstrInfo &tii,
 
 const unsigned*
 ARMBaseRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
-  static const unsigned CalleeSavedRegs[] = {
-    ARM::LR, ARM::R11, ARM::R10, ARM::R9, ARM::R8,
-    ARM::R7, ARM::R6,  ARM::R5,  ARM::R4,
+  return (STI.isTargetIOS()) ? CSR_iOS_SaveList : CSR_AAPCS_SaveList;
+}
 
-    ARM::D15, ARM::D14, ARM::D13, ARM::D12,
-    ARM::D11, ARM::D10, ARM::D9,  ARM::D8,
-    0
-  };
-
-  static const unsigned iOSCalleeSavedRegs[] = {
-    // iOS ABI deviates from ARM standard ABI. R9 is not a callee-saved
-    // register.
-    ARM::LR,  ARM::R7,  ARM::R6, ARM::R5, ARM::R4,
-    ARM::R11, ARM::R10, ARM::R8,
-
-    ARM::D15, ARM::D14, ARM::D13, ARM::D12,
-    ARM::D11, ARM::D10, ARM::D9,  ARM::D8,
-    0
-  };
-  return (STI.isTargetIOS()) ? iOSCalleeSavedRegs : CalleeSavedRegs;
+const uint32_t*
+ARMBaseRegisterInfo::getCallPreservedMask(CallingConv::ID) const {
+  return (STI.isTargetIOS()) ? CSR_iOS_RegMask : CSR_AAPCS_RegMask;
 }
 
 BitVector ARMBaseRegisterInfo::
diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.h b/lib/Target/ARM/ARMBaseRegisterInfo.h
index 317390cdf8c..534f624c54f 100644
--- a/lib/Target/ARM/ARMBaseRegisterInfo.h
+++ b/lib/Target/ARM/ARMBaseRegisterInfo.h
@@ -95,6 +95,7 @@ protected:
 public:
   /// Code Generation virtual methods...
   const unsigned *getCalleeSavedRegs(const MachineFunction *MF = 0) const;
+  const uint32_t *getCallPreservedMask(CallingConv::ID) const;
 
   BitVector getReservedRegs(const MachineFunction &MF) const;
 
diff --git a/lib/Target/ARM/ARMCallingConv.td b/lib/Target/ARM/ARMCallingConv.td
index c22a08eec72..ea491dc6809 100644
--- a/lib/Target/ARM/ARMCallingConv.td
+++ b/lib/Target/ARM/ARMCallingConv.td
@@ -164,3 +164,14 @@ def RetCC_ARM_AAPCS_VFP : CallingConv<[
                                  S9, S10, S11, S12, S13, S14, S15]>>,
   CCDelegateTo<RetCC_ARM_AAPCS_Common>
 ]>;
+
+//===----------------------------------------------------------------------===//
+// Callee-saved register lists.
+//===----------------------------------------------------------------------===//
+
+def CSR_AAPCS : CalleeSavedRegs<(add LR, R11, R10, R9, R8, R7, R6, R5, R4,
+                                     (sequence "D%u", 15, 8))>;
+
+// iOS ABI deviates from ARM standard ABI. R9 is not a callee-saved register.
+// Also save R7-R4 first to match the stack frame fixed spill areas.
+def CSR_iOS : CalleeSavedRegs<(add LR, R7, R6, R5, R4, (sub CSR_AAPCS, R9))>;