AMDGPU: Refactor treatment of denormal mode

Start moving towards treating this as a property of the calling
convention, and not the subtarget. The default denormal mode should
not be part of the subtarget, and be moved into a separate function
attribute.

This patch is still NFC. The denormal mode remains as a subtarget
feature for now, but make the necessary changes to switch to using an
attribute.

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUMachineFunction.h b/llvm/lib/Target/AMDGPU/AMDGPUMachineFunction.h
index 9818ab1ef14..1933e41c66f 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUMachineFunction.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUMachineFunction.h
@@ -11,6 +11,7 @@
 
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/CodeGen/MachineFunction.h"
+#include "Utils/AMDGPUBaseInfo.h"
 
 namespace llvm {
 
@@ -28,6 +29,9 @@ protected:
   /// Number of bytes in the LDS that are being used.
   unsigned LDSSize;
 
+  // State of MODE register, assumed FP mode.
+  AMDGPU::SIModeRegisterDefaults Mode;
+
   // Kernels + shaders. i.e. functions called by the driver and not called
   // by other functions.
   bool IsEntryFunction;
@@ -53,6 +57,10 @@ public:
     return LDSSize;
   }
 
+  AMDGPU::SIModeRegisterDefaults getMode() const {
+    return Mode;
+  }
+
   bool isEntryFunction() const {
     return IsEntryFunction;
   }