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SPIR-V: Aggressively prune unreachable merge, continue target

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More aggressively prune unreachable code as follows.
When no control flow edges reach a merge block or continue target:
- delete their contents so that:
  - a merge block becomes OpLabel, then OpUnreachable
  - a continue target becomes OpLabel, then an OpBranch back to the
    loop header
- any basic block which is dominated by such a merge block or continue
  target is removed as well.
- decorations targeting the removed instructions are removed.

Enables the SPIR-V builder post-processing step the GLSLANG_WEB case.
This commit is contained in:
David Neto 2019-10-21 14:50:31 -04:00
parent b131630e7c
commit 8c3d5b4b6c
44 changed files with 2398 additions and 1423 deletions
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54
Test/baseResults/spv.dead-after-continue.vert.out Normal file
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spv.dead-after-continue.vert
// Module Version 10000
// Generated by (magic number): 80007
// Id's are bound by 29
Capability Shader
1: ExtInstImport "GLSL.std.450"
MemoryModel Logical GLSL450
EntryPoint Vertex 4 "main" 20 28
Source GLSL 450
Name 4 "main"
Name 8 "i"
Name 20 "o"
Name 28 "c"
Decorate 20(o) Location 0
Decorate 28(c) Location 0
2: TypeVoid
3: TypeFunction 2
6: TypeInt 32 1
7: TypePointer Function 6(int)
9: 6(int) Constant 0
16: 6(int) Constant 5
17: TypeBool
19: TypePointer Output 6(int)
20(o): 19(ptr) Variable Output
21: 6(int) Constant 1
23: 6(int) Constant 2
26: 6(int) Constant 3
27: TypePointer Input 6(int)
28(c): 27(ptr) Variable Input
4(main): 2 Function None 3
5: Label
8(i): 7(ptr) Variable Function
Store 8(i) 9
Branch 10
10: Label
LoopMerge 12 13 None
Branch 14
14: Label
15: 6(int) Load 8(i)
18: 17(bool) SLessThan 15 16
BranchConditional 18 11 12
11: Label
Store 20(o) 21
Branch 13
13: Label
24: 6(int) Load 8(i)
25: 6(int) IAdd 24 21
Store 8(i) 25
Branch 10
12: Label
Store 20(o) 26
Return
FunctionEnd