[PATCH] D22084: AMDGPU: Fold out no-op kill intrinsics

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added reviewers: tstellarAMD, mareko, nhaehnle.
arsenm added a subscriber: llvm-commits.
Herald added subscribers: kzhuravl, arsenm.

http://reviews.llvm.org/D22084

Files:
  lib/Target/AMDGPU/SIISelLowering.cpp
  test/CodeGen/AMDGPU/skip-if-dead.ll

Index: test/CodeGen/AMDGPU/skip-if-dead.ll
===================================================================
--- test/CodeGen/AMDGPU/skip-if-dead.ll
+++ test/CodeGen/AMDGPU/skip-if-dead.ll
@@ -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)
Index: lib/Target/AMDGPU/SIISelLowering.cpp
===================================================================
--- lib/Target/AMDGPU/SIISelLowering.cpp
+++ lib/Target/AMDGPU/SIISelLowering.cpp
@@ -1960,6 +1960,14 @@
     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();
   }


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