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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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40
Test/baseResults/spv.dead-after-switch-break.vert.out Normal file
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spv.dead-after-switch-break.vert
// Module Version 10000
// Generated by (magic number): 80007
// Id's are bound by 21
Capability Shader
1: ExtInstImport "GLSL.std.450"
MemoryModel Logical GLSL450
EntryPoint Vertex 4 "main" 8 14
Source GLSL 450
Name 4 "main"
Name 8 "c"
Name 14 "o"
Decorate 8(c) Location 0
Decorate 14(o) Location 0
2: TypeVoid
3: TypeFunction 2
6: TypeInt 32 1
7: TypePointer Input 6(int)
8(c): 7(ptr) Variable Input
13: TypePointer Output 6(int)
14(o): 13(ptr) Variable Output
15: 6(int) Constant 1
17: 6(int) Constant 2
20: 6(int) Constant 3
4(main): 2 Function None 3
5: Label
9: 6(int) Load 8(c)
SelectionMerge 12 None
Switch 9 11
case 0: 10
11: Label
Branch 12
10: Label
Store 14(o) 15
Branch 12
12: Label
Store 14(o) 20
Return
FunctionEnd