From 41003af292ecb0807519eb29c9a25769110c40cb Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault@amd.com>
Date: Mon, 30 Nov 2015 21:16:07 +0000
Subject: [PATCH] AMDGPU: Error if too many user SGPRs used

llvm-svn: 254332
---
 llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp | 5 +++++
 llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h    | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp b/llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
index b96c48f0561d..87a0cf20d176 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
@@ -401,6 +401,11 @@ void AMDGPUAsmPrinter::getSIProgramInfo(SIProgramInfo &ProgInfo,
     ProgInfo.NumSGPR = AMDGPUSubtarget::FIXED_SGPR_COUNT_FOR_INIT_BUG;
   }
 
+  if (MFI->NumUserSGPRs > STM.getMaxNumUserSGPRs()) {
+    LLVMContext &Ctx = MF.getFunction()->getContext();
+    Ctx.emitError("too many user SGPRs used");
+  }
+
   ProgInfo.VGPRBlocks = (ProgInfo.NumVGPR - 1) / 4;
   ProgInfo.SGPRBlocks = (ProgInfo.NumSGPR - 1) / 8;
   // Set the value to initialize FP_ROUND and FP_DENORM parts of the mode
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h b/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
index 9921630326b4..971b5179b13c 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
@@ -303,6 +303,9 @@ public:
     return isAmdHsaOS() ? 0 : 36;
   }
 
+  unsigned getMaxNumUserSGPRs() const {
+    return 16;
+  }
 };
 
 } // End namespace llvm