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SPV return from main: Simplify a legacy design such returns are not jumps to exit block.

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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
2015-09-14 20:58:02 -06:00
parent 5f5b205ce9
commit e770b3e6cf
74 changed files with 9648 additions and 9816 deletions
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62
Test/baseResults/spv.while-simple.vert.out
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@@ -5,7 +5,7 @@ Linked vertex stage:
// Module Version 99
// Generated by (magic number): 51a00bb
// Id's are bound by 24
// Id's are bound by 23
Source ESSL 300
Capability Shader
@@ -13,41 +13,39 @@ Linked vertex stage:
MemoryModel Logical GLSL450
EntryPoint Vertex 4 "main"
Name 4 "main"
Name 9 "i"
Name 22 "gl_VertexID"
Name 23 "gl_InstanceID"
Decorate 22(gl_VertexID) BuiltIn VertexId
Decorate 22(gl_VertexID) NoStaticUse
Decorate 23(gl_InstanceID) BuiltIn InstanceId
Decorate 23(gl_InstanceID) NoStaticUse
Name 8 "i"
Name 21 "gl_VertexID"
Name 22 "gl_InstanceID"
Decorate 21(gl_VertexID) BuiltIn VertexId
Decorate 21(gl_VertexID) NoStaticUse
Decorate 22(gl_InstanceID) BuiltIn InstanceId
Decorate 22(gl_InstanceID) NoStaticUse
2: TypeVoid
3: TypeFunction 2
7: TypeInt 32 1
8: TypePointer Function 7(int)
10: 7(int) Constant 0
15: 7(int) Constant 10
16: TypeBool
19: 7(int) Constant 1
21: TypePointer Input 7(int)
22(gl_VertexID): 21(ptr) Variable Input
23(gl_InstanceID): 21(ptr) Variable Input
6: TypeInt 32 1
7: TypePointer Function 6(int)
9: 6(int) Constant 0
14: 6(int) Constant 10
15: TypeBool
18: 6(int) Constant 1
20: TypePointer Input 6(int)
21(gl_VertexID): 20(ptr) Variable Input
22(gl_InstanceID): 20(ptr) Variable Input
4(main): 2 Function None 3
5: Label
9(i): 8(ptr) Variable Function
Store 9(i) 10
Branch 11
8(i): 7(ptr) Variable Function
Store 8(i) 9
Branch 10
10: Label
13: 6(int) Load 8(i)
16: 15(bool) SLessThan 13 14
LoopMerge 11 None
BranchConditional 16 12 11
12: Label
17: 6(int) Load 8(i)
19: 6(int) IAdd 17 18
Store 8(i) 19
Branch 10
11: Label
14: 7(int) Load 9(i)
17: 16(bool) SLessThan 14 15
LoopMerge 12 None
BranchConditional 17 13 12
13: Label
18: 7(int) Load 9(i)
20: 7(int) IAdd 18 19
Store 9(i) 20
Branch 11
12: Label
Branch 6
6: Label
Return
FunctionEnd