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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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3
Test/baseResults/spv.functionCall.frag.out
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@ -105,8 +105,7 @@ WARNING: 0:5: varying deprecated in version 130; may be removed in future releas
44: Label
ReturnValue 45
41: Label
47: 6(float) Undef
ReturnValue 47
Unreachable
FunctionEnd
18(missingReturn(): 6(float) Function None 15
19: Label