Add new function attribute - noredzone.

Update code generator to use this attribute and remove DisableRedZone target option.
Update llc to set this attribute when -disable-red-zone command line option is used.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72894 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 2 insertions, 6 deletions

diff --git a/lib/Target/PowerPC/PPCRegisterInfo.cpp b/lib/Target/PowerPC/PPCRegisterInfo.cpp
index 5d5beeb..cb31506 100644
--- a/lib/Target/PowerPC/PPCRegisterInfo.cpp
+++ b/lib/Target/PowerPC/PPCRegisterInfo.cpp
@@ -908,6 +908,7 @@ void PPCRegisterInfo::determineFrameLayout(MachineFunction &MF) const {
   // If we are a leaf function, and use up to 224 bytes of stack space,
   // don't have a frame pointer, calls, or dynamic alloca then we do not need
   // to adjust the stack pointer (we fit in the Red Zone).
+  bool DisableRedZone = MF.getFunction()->hasFnAttr(Attribute::NoRedZone);
   if (!DisableRedZone &&
       FrameSize <= 224 &&                          // Fits in red zone.
       !MFI->hasVarSizedObjects() &&                // No dynamic alloca.
diff --git a/lib/Target/TargetMachine.cpp b/lib/Target/TargetMachine.cpp
index 1b042dd..1259dbe 100644
--- a/lib/Target/TargetMachine.cpp
+++ b/lib/Target/TargetMachine.cpp
@@ -41,7 +41,6 @@ namespace llvm {
   bool RealignStack;
   bool DisableJumpTables;
   bool StrongPHIElim;
-  bool DisableRedZone;
   bool AsmVerbosityDefault(false);
 }
 
@@ -163,11 +162,6 @@ EnableStrongPHIElim(cl::Hidden, "strong-phi-elim",
   cl::desc("Use strong PHI elimination."),
   cl::location(StrongPHIElim),
   cl::init(false));
-static cl::opt<bool, true>
-DisableRedZoneOption("disable-red-zone",
-  cl::desc("Do not emit code that uses the red zone."),
-  cl::location(DisableRedZone),
-  cl::init(false));
 
 //---------------------------------------------------------------------------
 // TargetMachine Class
diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp
index 674be29..5d56db5 100644
--- a/lib/Target/X86/X86RegisterInfo.cpp
+++ b/lib/Target/X86/X86RegisterInfo.cpp
@@ -751,6 +751,7 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
   // function, and use up to 128 bytes of stack space, don't have a frame
   // pointer, calls, or dynamic alloca then we do not need to adjust the
   // stack pointer (we fit in the Red Zone).
+  bool DisableRedZone = Fn->hasFnAttr(Attribute::NoRedZone);
   if (Is64Bit && !DisableRedZone &&
       !needsStackRealignment(MF) &&
       !MFI->hasVarSizedObjects() &&                // No dynamic alloca.