commit 2e6496026f41d2c05ff038d14df9972f8a27fb94
author Evan Cheng <evan.cheng@apple.com> Fri May 20 00:54:37 2011 +0000
committer Evan Cheng <evan.cheng@apple.com> Fri May 20 00:54:37 2011 +0000
tree 3dde6780a871b0e1bba1d4d27f38e6937fea0298
parent 5a4b3d8c8f52ee225ffc65c7d6cebc78b1ec7808

Revert r131664 and fix it in instcombine instead. rdar://9467055

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131708 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMISelLowering.cpp

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index e9a9963..2c90aa2 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -1182,7 +1182,7 @@
   bool IsStructRet    = (Outs.empty()) ? false : Outs[0].Flags.isSRet();
   bool IsSibCall = false;
   // Temporarily disable tail calls so things don't break.
-  if (!EnableARMTailCalls)
+  if (!EnableARMTailCalls && !Subtarget->supportsTailCall())
     isTailCall = false;
   if (isTailCall) {
     // Check if it's really possible to do a tail call.

lib/Target/ARM/ARMSubtarget.cpp

diff --git a/lib/Target/ARM/ARMSubtarget.cpp b/lib/Target/ARM/ARMSubtarget.cpp
index c6f266b..0509d58 100644
--- a/lib/Target/ARM/ARMSubtarget.cpp
+++ b/lib/Target/ARM/ARMSubtarget.cpp
@@ -46,6 +46,7 @@
   , PostRAScheduler(false)
   , IsR9Reserved(ReserveR9)
   , UseMovt(false)
+  , SupportsTailCall(false)
   , HasFP16(false)
   , HasD16(false)
   , HasHardwareDivide(false)
@@ -153,6 +154,8 @@
   else {
     IsR9Reserved = ReserveR9 | (ARMArchVersion < V6);
     UseMovt = DarwinUseMOVT && hasV6T2Ops();
+    const Triple &T = getTargetTriple();
+    SupportsTailCall = T.getOS() == Triple::IOS && !T.isOSVersionLT(5, 0);
   }
 
   if (!isThumb() || hasThumb2())

lib/Target/ARM/ARMSubtarget.h

diff --git a/lib/Target/ARM/ARMSubtarget.h b/lib/Target/ARM/ARMSubtarget.h
index 0271c87..c149410 100644
--- a/lib/Target/ARM/ARMSubtarget.h
+++ b/lib/Target/ARM/ARMSubtarget.h
@@ -87,6 +87,11 @@
   /// imms (including global addresses).
   bool UseMovt;
 
+  /// SupportsTailCall - True if the OS supports tail call. The dynamic linker
+  /// must be able to synthesize call stubs for interworking between ARM and
+  /// Thumb.
+  bool SupportsTailCall;
+
   /// HasFP16 - True if subtarget supports half-precision FP (We support VFP+HF
   /// only so far)
   bool HasFP16;
@@ -217,6 +222,7 @@
   bool isR9Reserved() const { return IsR9Reserved; }
 
   bool useMovt() const { return UseMovt && hasV6T2Ops(); }
+  bool supportsTailCall() const { return SupportsTailCall; }
 
   bool allowsUnalignedMem() const { return AllowsUnalignedMem; }
 

lib/Target/X86/X86ISelLowering.cpp

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 88f5d31..e5156f8 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -10939,19 +10939,6 @@
     KnownZero |= APInt::getHighBitsSet(Mask.getBitWidth(),
                                        Mask.getBitWidth() - 1);
     break;
-
-  case ISD::INTRINSIC_WO_CHAIN: {
-    unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
-    switch (IntNo) {
-      default: break;
-      case Intrinsic::x86_sse42_crc64_8:
-      case Intrinsic::x86_sse42_crc64_64:
-        // crc32 with 64-bit destination zeros high 32-bit.
-        KnownZero |= APInt::getHighBitsSet(64, 32);
-        break;
-    }
-    break;
-  }
   }
 }