[llvm] r275253 - AMDGPU: Fold out no-op kill intrinsics

[Matt Arsenault via llvm-commits]

Author: arsenm
Date: Wed Jul 13 01:04:22 2016
New Revision: 275253

URL: http://llvm.org/viewvc/llvm-project?rev=275253&view=rev
Log:
AMDGPU: Fold out no-op kill intrinsics

Modified:
    llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp
    llvm/trunk/test/CodeGen/AMDGPU/skip-if-dead.ll

Modified: llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp?rev=275253&r1=275252&r2=275253&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp Wed Jul 13 01:04:22 2016
@@ -1961,6 +1961,14 @@ SDValue SITargetLowering::LowerINTRINSIC
     return DAG.getMemIntrinsicNode(AMDGPUISD::TBUFFER_STORE_FORMAT, DL,
                                    Op->getVTList(), Ops, VT, MMO);
   }
+  case AMDGPUIntrinsic::AMDGPU_kill: {
+    if (const ConstantFPSDNode *K = dyn_cast<ConstantFPSDNode>(Op.getOperand(2))) {
+      if (!K->isNegative())
+        return Chain;
+    }
+
+    return Op;
+  }
   default:
     return SDValue();
   }

Modified: llvm/trunk/test/CodeGen/AMDGPU/skip-if-dead.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AMDGPU/skip-if-dead.ll?rev=275253&r1=275252&r2=275253&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/AMDGPU/skip-if-dead.ll (original)
+++ llvm/trunk/test/CodeGen/AMDGPU/skip-if-dead.ll Wed Jul 13 01:04:22 2016
@@ -2,7 +2,6 @@
 
 ; CHECK-LABEL: {{^}}test_kill_depth_0_imm_pos:
 ; CHECK-NEXT: ; BB#0:
-; CHECK-NEXT: ; BB#1:
 ; CHECK-NEXT: s_endpgm
 define amdgpu_ps void @test_kill_depth_0_imm_pos() #0 {
   call void @llvm.AMDGPU.kill(float 0.0)