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https://github.com/KhronosGroup/glslang
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SPV 1.4: Use OpSelect for trivial typed non-scalar/vector expressions.
This commit is contained in:
John Kessenich
parent
cfea59d357
commit
0c1e71a123
@ -2615,6 +2615,19 @@ bool TGlslangToSpvTraverser::visitAggregate(glslang::TVisit visit, glslang::TInt
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// next layer copies r-values into memory to use the access-chain mechanism
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bool TGlslangToSpvTraverser::visitSelection(glslang::TVisit /* visit */, glslang::TIntermSelection* node)
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{
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// see if OpSelect can handle it
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const auto isOpSelectable = [&]() {
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if (node->getBasicType() == glslang::EbtVoid)
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return false;
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// OpSelect can do all other types starting with SPV 1.4
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if (glslangIntermediate->getSpv().spv < glslang::EShTargetSpv_1_4) {
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// pre-1.4, only scalars and vectors can be handled
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if ((!node->getType().isScalar() && !node->getType().isVector()))
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return false;
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}
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return true;
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};
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// See if it simple and safe, or required, to execute both sides.
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// Crucially, side effects must be either semantically required or avoided,
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// and there are performance trade-offs.
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@ -2633,9 +2646,7 @@ bool TGlslangToSpvTraverser::visitSelection(glslang::TVisit /* visit */, glslang
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// if not required to execute both, decide based on performance/practicality...
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// see if OpSelect can handle it
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if ((!node->getType().isScalar() && !node->getType().isVector()) ||
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node->getBasicType() == glslang::EbtVoid)
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if (!isOpSelectable())
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return false;
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assert(node->getType() == node->getTrueBlock() ->getAsTyped()->getType() &&
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@ -2672,14 +2683,16 @@ bool TGlslangToSpvTraverser::visitSelection(glslang::TVisit /* visit */, glslang
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// emit code to select between trueValue and falseValue
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// see if OpSelect can handle it
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if (node->getType().isScalar() || node->getType().isVector()) {
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if (isOpSelectable()) {
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// Emit OpSelect for this selection.
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// smear condition to vector, if necessary (AST is always scalar)
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if (builder.isVector(trueValue))
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// Before 1.4, smear like for mix(), starting with 1.4, keep it scalar
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if (glslangIntermediate->getSpv().spv < glslang::EShTargetSpv_1_4 && builder.isVector(trueValue)) {
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condition = builder.smearScalar(spv::NoPrecision, condition,
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builder.makeVectorType(builder.makeBoolType(),
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builder.getNumComponents(trueValue)));
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}
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// OpSelect
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result = builder.createTriOp(spv::OpSelect,
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153
Test/baseResults/spv.1.4.OpSelect.frag.out
Executable file
153
Test/baseResults/spv.1.4.OpSelect.frag.out
Executable file
@ -0,0 +1,153 @@
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spv.1.4.OpSelect.frag
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Validation failed
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// Module Version 10400
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// Generated by (magic number): 80007
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// Id's are bound by 98
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Capability Shader
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1: ExtInstImport "GLSL.std.450"
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MemoryModel Logical GLSL450
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EntryPoint Fragment 4 "main" 17 20 82 84
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ExecutionMode 4 OriginUpperLeft
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Source GLSL 450
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Name 4 "main"
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Name 6 "fun1("
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Name 8 "fun2("
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Name 12 "f1"
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Name 14 "f2"
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Name 17 "outv"
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Name 20 "cond"
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Name 30 "iv1"
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Name 34 "iv2"
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Name 53 "m1"
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Name 59 "m2"
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Name 75 "S1"
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MemberName 75(S1) 0 "a"
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MemberName 75(S1) 1 "b"
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Name 77 "fv"
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Name 82 "in1"
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Name 84 "in2"
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Decorate 17(outv) Location 0
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Decorate 20(cond) Flat
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Decorate 20(cond) Location 4
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Decorate 82(in1) Flat
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Decorate 82(in1) Location 0
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Decorate 84(in2) Flat
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Decorate 84(in2) Location 2
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2: TypeVoid
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3: TypeFunction 2
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10: TypeFloat 32
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11: TypePointer Function 10(float)
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13: 10(float) Constant 1065353216
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15: 10(float) Constant 1073741824
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16: TypePointer Output 10(float)
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17(outv): 16(ptr) Variable Output
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18: TypeInt 32 1
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19: TypePointer Input 18(int)
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20(cond): 19(ptr) Variable Input
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22: 18(int) Constant 8
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23: TypeBool
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28: TypeVector 18(int) 4
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29: TypePointer Function 28(ivec4)
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39: 18(int) Constant 0
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44: TypeInt 32 0
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45: 44(int) Constant 2
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50: TypeVector 10(float) 3
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51: TypeMatrix 50(fvec3) 3
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52: TypePointer Function 51
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54: 10(float) Constant 0
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55: 50(fvec3) ConstantComposite 13 54 54
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56: 50(fvec3) ConstantComposite 54 13 54
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57: 50(fvec3) ConstantComposite 54 54 13
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58: 51 ConstantComposite 55 56 57
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60: 50(fvec3) ConstantComposite 15 54 54
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61: 50(fvec3) ConstantComposite 54 15 54
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62: 50(fvec3) ConstantComposite 54 54 15
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63: 51 ConstantComposite 60 61 62
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65: 18(int) Constant 20
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70: 18(int) Constant 2
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71: 44(int) Constant 1
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75(S1): TypeStruct 10(float) 18(int)
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76: TypePointer Function 75(S1)
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79: 18(int) Constant 5
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81: TypePointer Input 75(S1)
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82(in1): 81(ptr) Variable Input
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84(in2): 81(ptr) Variable Input
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4(main): 2 Function None 3
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5: Label
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12(f1): 11(ptr) Variable Function
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14(f2): 11(ptr) Variable Function
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30(iv1): 29(ptr) Variable Function
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34(iv2): 29(ptr) Variable Function
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53(m1): 52(ptr) Variable Function
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59(m2): 52(ptr) Variable Function
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77(fv): 76(ptr) Variable Function
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Store 12(f1) 13
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Store 14(f2) 15
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21: 18(int) Load 20(cond)
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24: 23(bool) SLessThan 21 22
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25: 10(float) Load 12(f1)
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26: 10(float) Load 14(f2)
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27: 10(float) Select 24 25 26
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Store 17(outv) 27
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31: 10(float) Load 12(f1)
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32: 18(int) ConvertFToS 31
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33: 28(ivec4) CompositeConstruct 32 32 32 32
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Store 30(iv1) 33
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35: 10(float) Load 14(f2)
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36: 18(int) ConvertFToS 35
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37: 28(ivec4) CompositeConstruct 36 36 36 36
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Store 34(iv2) 37
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38: 18(int) Load 20(cond)
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40: 23(bool) SGreaterThan 38 39
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41: 28(ivec4) Load 30(iv1)
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42: 28(ivec4) Load 34(iv2)
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43: 28(ivec4) Select 40 41 42
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46: 18(int) CompositeExtract 43 2
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47: 10(float) ConvertSToF 46
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48: 10(float) Load 17(outv)
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49: 10(float) FMul 48 47
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Store 17(outv) 49
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Store 53(m1) 58
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Store 59(m2) 63
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64: 18(int) Load 20(cond)
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66: 23(bool) SLessThan 64 65
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67: 51 Load 53(m1)
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68: 51 Load 59(m2)
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69: 51 Select 66 67 68
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72: 10(float) CompositeExtract 69 2 1
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73: 10(float) Load 17(outv)
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74: 10(float) FMul 73 72
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Store 17(outv) 74
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78: 18(int) Load 20(cond)
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80: 23(bool) SGreaterThan 78 79
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83: 75(S1) Load 82(in1)
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85: 75(S1) Load 84(in2)
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86: 75(S1) Select 80 83 85
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Store 77(fv) 86
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87: 11(ptr) AccessChain 77(fv) 39
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88: 10(float) Load 87
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89: 10(float) Load 17(outv)
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90: 10(float) FMul 89 88
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Store 17(outv) 90
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91: 18(int) Load 20(cond)
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92: 23(bool) SGreaterThan 91 39
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SelectionMerge 94 None
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BranchConditional 92 93 96
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93: Label
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95: 2 FunctionCall 6(fun1()
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Branch 94
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96: Label
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97: 2 FunctionCall 8(fun2()
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Branch 94
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94: Label
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Return
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FunctionEnd
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6(fun1(): 2 Function None 3
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7: Label
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Return
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FunctionEnd
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8(fun2(): 2 Function None 3
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9: Label
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Return
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FunctionEnd
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37
Test/spv.1.4.OpSelect.frag
Executable file
37
Test/spv.1.4.OpSelect.frag
Executable file
@ -0,0 +1,37 @@
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#version 450
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struct S1 {
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float a;
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int b;
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};
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layout(location = 0) flat in S1 in1;
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layout(location = 2) flat in S1 in2;
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layout(location = 4) flat in int cond;
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layout(location = 0) out float outv;
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void fun1(){}
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void fun2(){}
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void main()
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{
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// glslang will only make OpSelect for very trivial looking expressions
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float f1 = 1.0;
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float f2 = 2.0;
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outv = cond < 8 ? f1 : f2; // in all versions
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ivec4 iv1 = ivec4(f1);
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ivec4 iv2 = ivec4(f2);
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outv *= (cond > 0 ? iv1 : iv2).z; // in all versions, but in 1.4 as scalar condition, not smeared ala mix()
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mat3 m1 = mat3(1.0);
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mat3 m2 = mat3(2.0);
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outv *= (cond < 20 ? m1 : m2)[2][1]; // in 1.4, but not before
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S1 fv = cond > 5 ? in1 : in2; // in 1.4, but not before
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outv *= fv.a;
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cond > 0 ? fun1() : fun2(); // not allowed by any version
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}
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1
gtests/Spv.FromFile.cpp
Normal file → Executable file
1
gtests/Spv.FromFile.cpp
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@ -466,6 +466,7 @@ INSTANTIATE_TEST_CASE_P(
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Glsl, CompileToSpirv14Test,
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::testing::ValuesIn(std::vector<std::string>({
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"spv.1.4.OpEntryPoint.frag",
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"spv.1.4.OpSelect.frag",
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})),
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FileNameAsCustomTestSuffix
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);
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