From 07043279f60622243d16d8a3f60805960482083c Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Tue, 21 Feb 2012 20:46:00 +0000
Subject: [PATCH] Proper support for a bastardized darwin-eabi hybird ABI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151083 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMAsmPrinter.cpp       | 4 +---
 lib/Target/ARM/ARMISelLowering.cpp     | 2 +-
 lib/Target/ARM/ARMSelectionDAGInfo.cpp | 4 ++--
 lib/Target/ARM/ARMSubtarget.cpp        | 5 +++--
 test/CodeGen/ARM/memfunc.ll            | 3 +++
 5 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
index 2297390f664..8d934207273 100644
--- a/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -599,10 +599,8 @@ void ARMAsmPrinter::EmitStartOfAsmFile(Module &M) {
   OutStreamer.EmitAssemblerFlag(MCAF_SyntaxUnified);
 
   // Emit ARM Build Attributes
-  if (Subtarget->isTargetELF()) {
-
+  if (Subtarget->isTargetELF())
     emitAttributes();
-  }
 }
 
 
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 40e1e2248e5..370d3aacdaf 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -261,7 +261,7 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
   setLibcallName(RTLIB::SRL_I128, 0);
   setLibcallName(RTLIB::SRA_I128, 0);
 
-  if (Subtarget->isAAPCS_ABI()) {
+  if (Subtarget->isAAPCS_ABI() && !Subtarget->isTargetDarwin()) {
     // Double-precision floating-point arithmetic helper functions
     // RTABI chapter 4.1.2, Table 2
     setLibcallName(RTLIB::ADD_F64, "__aeabi_dadd");
diff --git a/lib/Target/ARM/ARMSelectionDAGInfo.cpp b/lib/Target/ARM/ARMSelectionDAGInfo.cpp
index 36d58de77e9..3113b62c1f7 100644
--- a/lib/Target/ARM/ARMSelectionDAGInfo.cpp
+++ b/lib/Target/ARM/ARMSelectionDAGInfo.cpp
@@ -145,8 +145,8 @@ EmitTargetCodeForMemset(SelectionDAG &DAG, DebugLoc dl,
                         SDValue Src, SDValue Size,
                         unsigned Align, bool isVolatile,
                         MachinePointerInfo DstPtrInfo) const {
-  // Use default for non AAPCS subtargets
-  if (!Subtarget->isAAPCS_ABI())
+  // Use default for non AAPCS (or Darwin) subtargets
+  if (!Subtarget->isAAPCS_ABI() || Subtarget->isTargetDarwin())
     return SDValue();
 
   const ARMTargetLowering &TLI =
diff --git a/lib/Target/ARM/ARMSubtarget.cpp b/lib/Target/ARM/ARMSubtarget.cpp
index 3609cb4f0df..64b2b620eb4 100644
--- a/lib/Target/ARM/ARMSubtarget.cpp
+++ b/lib/Target/ARM/ARMSubtarget.cpp
@@ -105,6 +105,8 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &CPU,
   computeIssueWidth();
 
   if (TT.find("eabi") != std::string::npos)
+    // FIXME: We might want to separate AAPCS and EABI. Some systems, e.g.
+    // Darwin-EABI conforms to AACPS but not the rest of EABI.
     TargetABI = ARM_ABI_AAPCS;
 
   if (isAAPCS_ABI())
@@ -115,8 +117,7 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &CPU,
   else {
     IsR9Reserved = ReserveR9 | !HasV6Ops;
     UseMovt = DarwinUseMOVT && hasV6T2Ops();
-    const Triple &T = getTargetTriple();
-    SupportsTailCall = !T.isOSVersionLT(5, 0);
+    SupportsTailCall = !getTargetTriple().isOSVersionLT(5, 0);
   }
 
   if (!isThumb() || hasThumb2())
diff --git a/test/CodeGen/ARM/memfunc.ll b/test/CodeGen/ARM/memfunc.ll
index aeda02282b9..fe0056c42a1 100644
--- a/test/CodeGen/ARM/memfunc.ll
+++ b/test/CodeGen/ARM/memfunc.ll
@@ -1,4 +1,5 @@
 ; RUN: llc < %s -mtriple=armv7-apple-ios -o - | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv7m-darwin-eabi -o - | FileCheck %s --check-prefix=DARWIN
 ; RUN: llc < %s -mtriple=arm-none-eabi -o - | FileCheck --check-prefix=EABI %s
 
 @from = common global [500 x i32] zeroinitializer, align 4
@@ -18,6 +19,8 @@ entry:
         ; EABI memset swaps arguments
         ; CHECK: mov r1, #0
         ; CHECK: memset
+        ; DARWIN: movs r1, #0
+        ; DARWIN: memset
         ; EABI: mov r2, #0
         ; EABI: __aeabi_memset
         call void @llvm.memset.p0i8.i32(i8* bitcast ([500 x i32]* @from to i8*), i8 0, i32 500, i32 0, i1 false)