1+ /* ===================== begin_copyright_notice ==================================
2+
3+ Copyright (c) 2017 Intel Corporation
4+
5+ Permission is hereby granted, free of charge, to any person obtaining a
6+ copy of this software and associated documentation files (the
7+ "Software"), to deal in the Software without restriction, including
8+ without limitation the rights to use, copy, modify, merge, publish,
9+ distribute, sublicense, and/or sell copies of the Software, and to
10+ permit persons to whom the Software is furnished to do so, subject to
11+ the following conditions:
12+
13+ The above copyright notice and this permission notice shall be included
14+ in all copies or substantial portions of the Software.
15+
16+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17+ OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
19+ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
20+ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
21+ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
22+ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23+
24+
25+ ======================= end_copyright_notice ==================================*/
26+
27+ #include " Compiler/IGCPassSupport.h"
28+ #include " common/LLVMWarningsPush.hpp"
29+ #include " llvm/IR/InstIterator.h"
30+ #include " common/LLVMWarningsPop.hpp"
31+ #include " GenISAIntrinsics/GenIntrinsicInst.h"
32+ #include " Compiler/CodeGenPublicEnums.h"
33+ #include " Compiler/CISACodeGen/helper.h"
34+
35+ #include < llvm/IR/PassManager.h>
36+
37+ using namespace IGC ;
38+ using namespace llvm ;
39+
40+ class RemoveNonPositionOutput : public llvm ::FunctionPass
41+ {
42+ public:
43+ static char ID;
44+
45+ RemoveNonPositionOutput ();
46+
47+ ~RemoveNonPositionOutput () {}
48+
49+ virtual void getAnalysisUsage (llvm::AnalysisUsage &AU) const override
50+ {
51+ AU.setPreservesCFG ();
52+ }
53+
54+ virtual bool runOnFunction (llvm::Function &F) override ;
55+
56+ virtual llvm::StringRef getPassName () const override
57+ {
58+ return " remove non-position output in vertex shader"
59+ }
60+ };
61+
62+ llvm::FunctionPass* createRemoveNonPositionOutputPass ()
63+ {
64+ return new RemoveNonPositionOutput ();
65+ }
66+
67+ // Register pass to igc-opt
68+ #define PASS_FLAG_POSH " igc-remove-nonposition-output"
69+ #define PASS_DESCRIPTION_POSH " Custom Pass for Position-Only Shader"
70+ #define PASS_CFG_ONLY_POSH false
71+ #define PASS_ANALYSIS_POSH false
72+ IGC_INITIALIZE_PASS_BEGIN (RemoveNonPositionOutput, PASS_FLAG_POSH, PASS_DESCRIPTION_POSH, PASS_CFG_ONLY_POSH, PASS_ANALYSIS_POSH)
73+ IGC_INITIALIZE_PASS_END(RemoveNonPositionOutput, PASS_FLAG_POSH, PASS_DESCRIPTION_POSH, PASS_CFG_ONLY_POSH, PASS_ANALYSIS_POSH)
74+
75+ char RemoveNonPositionOutput::ID = 0;
76+
77+ RemoveNonPositionOutput::RemoveNonPositionOutput () : FunctionPass(ID)
78+ {
79+ initializeRemoveNonPositionOutputPass (*PassRegistry::getPassRegistry ());
80+ }
81+
82+ bool RemoveNonPositionOutput::runOnFunction (Function &F)
83+ {
84+ // Initialize the worklist to all of the instructions ready to process...
85+ SmallVector<Instruction*, 10 > instructionToRemove;
86+ for (inst_iterator II = inst_begin (F), E = inst_end (F); II != E; ++II)
87+ {
88+ if (GenIntrinsicInst *inst = dyn_cast<GenIntrinsicInst>(&*II))
89+ {
90+ if (inst->getIntrinsicID () == GenISAIntrinsic::GenISA_OUTPUT)
91+ {
92+ const ShaderOutputType usage = static_cast <ShaderOutputType>(
93+ llvm::cast<llvm::ConstantInt>(inst->getOperand (4 ))->getZExtValue ());
94+ if (usage != SHADER_OUTPUT_TYPE_POSITION &&
95+ usage != SHADER_OUTPUT_TYPE_POINTWIDTH &&
96+ usage != SHADER_OUTPUT_TYPE_VIEWPORT_ARRAY_INDEX &&
97+ usage != SHADER_OUTPUT_TYPE_CLIPDISTANCE_LO &&
98+ usage != SHADER_OUTPUT_TYPE_CLIPDISTANCE_HI)
99+ {
100+ instructionToRemove.push_back (inst);
101+ }
102+ }
103+ }
104+ }
105+ bool changed = false ;
106+ uint num = instructionToRemove.size ();
107+ for (uint i = 0 ; i < num; ++i)
108+ {
109+ instructionToRemove[i]->eraseFromParent ();
110+ changed = true ;
111+ }
112+ return changed;
113+ }
0 commit comments