SPV return from main: Simplify a legacy design such returns are not jumps to exit block.
Structured control-flow rules allow leaving the middle of a construct through a return, but not through a jump to a block that does a return. Addresses issue #58.
This commit is contained in:
John Kessenich
@@ -5,7 +5,7 @@ Linked vertex stage:
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// Module Version 99
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// Generated by (magic number): 51a00bb
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// Id's are bound by 52
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// Id's are bound by 51
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Source ESSL 300
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Capability Shader
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@@ -13,96 +13,94 @@ Linked vertex stage:
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MemoryModel Logical GLSL450
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EntryPoint Vertex 4 "main"
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Name 4 "main"
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Name 9 "i"
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Name 25 "A"
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Name 31 "B"
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Name 34 "C"
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Name 40 "D"
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Name 43 "E"
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Name 45 "F"
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Name 47 "G"
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Name 50 "gl_VertexID"
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Name 51 "gl_InstanceID"
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Decorate 50(gl_VertexID) BuiltIn VertexId
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Decorate 50(gl_VertexID) NoStaticUse
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Decorate 51(gl_InstanceID) BuiltIn InstanceId
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Decorate 51(gl_InstanceID) NoStaticUse
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Name 8 "i"
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Name 24 "A"
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Name 30 "B"
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Name 33 "C"
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Name 39 "D"
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Name 42 "E"
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Name 44 "F"
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Name 46 "G"
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Name 49 "gl_VertexID"
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Name 50 "gl_InstanceID"
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Decorate 49(gl_VertexID) BuiltIn VertexId
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Decorate 49(gl_VertexID) NoStaticUse
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Decorate 50(gl_InstanceID) BuiltIn InstanceId
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Decorate 50(gl_InstanceID) NoStaticUse
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2: TypeVoid
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3: TypeFunction 2
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7: TypeInt 32 1
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8: TypePointer Function 7(int)
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10: 7(int) Constant 0
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15: TypeBool
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16: 15(bool) ConstantTrue
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20: 7(int) Constant 1
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22: 7(int) Constant 19
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27: 7(int) Constant 2
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32: 15(bool) ConstantFalse
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36: 7(int) Constant 5
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41: 7(int) Constant 3
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44: 7(int) Constant 42
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46: 7(int) Constant 99
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48: 7(int) Constant 12
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49: TypePointer Input 7(int)
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50(gl_VertexID): 49(ptr) Variable Input
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51(gl_InstanceID): 49(ptr) Variable Input
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6: TypeInt 32 1
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7: TypePointer Function 6(int)
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9: 6(int) Constant 0
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14: TypeBool
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15: 14(bool) ConstantTrue
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19: 6(int) Constant 1
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21: 6(int) Constant 19
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26: 6(int) Constant 2
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31: 14(bool) ConstantFalse
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35: 6(int) Constant 5
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40: 6(int) Constant 3
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43: 6(int) Constant 42
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45: 6(int) Constant 99
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47: 6(int) Constant 12
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48: TypePointer Input 6(int)
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49(gl_VertexID): 48(ptr) Variable Input
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50(gl_InstanceID): 48(ptr) Variable Input
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4(main): 2 Function None 3
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5: Label
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9(i): 8(ptr) Variable Function
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25(A): 8(ptr) Variable Function
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31(B): 8(ptr) Variable Function
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34(C): 8(ptr) Variable Function
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40(D): 8(ptr) Variable Function
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43(E): 8(ptr) Variable Function
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45(F): 8(ptr) Variable Function
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47(G): 8(ptr) Variable Function
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Store 9(i) 10
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Branch 11
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11: Label
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14: 15(bool) Phi 16 5 32 29 32 39
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LoopMerge 12 None
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Branch 17
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17: Label
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SelectionMerge 13 None
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BranchConditional 14 13 18
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18: Label
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19: 7(int) Load 9(i)
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21: 7(int) IAdd 19 20
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Store 9(i) 21
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23: 15(bool) SLessThan 21 22
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SelectionMerge 24 None
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BranchConditional 23 24 12
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24: Label
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Branch 13
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13: Label
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Store 25(A) 10
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26: 7(int) Load 9(i)
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28: 15(bool) IEqual 26 27
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SelectionMerge 30 None
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BranchConditional 28 29 30
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29: Label
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Store 31(B) 20
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Branch 11
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33: Label
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Store 34(C) 27
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Branch 30
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30: Label
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35: 7(int) Load 9(i)
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37: 15(bool) IEqual 35 36
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SelectionMerge 39 None
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BranchConditional 37 38 39
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38: Label
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Store 40(D) 41
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8(i): 7(ptr) Variable Function
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24(A): 7(ptr) Variable Function
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30(B): 7(ptr) Variable Function
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33(C): 7(ptr) Variable Function
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39(D): 7(ptr) Variable Function
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42(E): 7(ptr) Variable Function
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44(F): 7(ptr) Variable Function
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46(G): 7(ptr) Variable Function
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Store 8(i) 9
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Branch 10
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10: Label
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13: 14(bool) Phi 15 5 31 28 31 38
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LoopMerge 11 None
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Branch 16
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16: Label
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SelectionMerge 12 None
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BranchConditional 13 12 17
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17: Label
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18: 6(int) Load 8(i)
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20: 6(int) IAdd 18 19
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Store 8(i) 20
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22: 14(bool) SLessThan 20 21
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SelectionMerge 23 None
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BranchConditional 22 23 11
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23: Label
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Branch 12
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42: Label
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Store 43(E) 44
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Branch 39
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39: Label
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Store 45(F) 46
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Branch 11
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12: Label
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Store 47(G) 48
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Branch 6
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6: Label
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Store 24(A) 9
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25: 6(int) Load 8(i)
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27: 14(bool) IEqual 25 26
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SelectionMerge 29 None
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BranchConditional 27 28 29
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28: Label
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Store 30(B) 19
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Branch 10
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32: Label
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Store 33(C) 26
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Branch 29
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29: Label
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34: 6(int) Load 8(i)
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36: 14(bool) IEqual 34 35
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SelectionMerge 38 None
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BranchConditional 36 37 38
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37: Label
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Store 39(D) 40
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Branch 11
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41: Label
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Store 42(E) 43
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Branch 38
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38: Label
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Store 44(F) 45
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Branch 10
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11: Label
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Store 46(G) 47
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Return
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FunctionEnd
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