Add pass to reaplce invalid opcodes

Creates a pass that will remove instructions that are invalid for the
current shader stage.  For the instruction to be considered for replacement

1) The opcode must be valid for a shader modules.
2) The opcode must be invalid for the current shader stage.
3) All entry points to the module must be for the same shader stage.
4) The function containing the instruction must be reachable from an entry point.

Fixes #1247.

1 files changed, 4 insertions, 0 deletions

diff --git a/include/spirv-tools/optimizer.hpp b/include/spirv-tools/optimizer.hpp
index a8d8da0c..b866bc69 100644
--- a/include/spirv-tools/optimizer.hpp
+++ b/include/spirv-tools/optimizer.hpp
@@ -500,6 +500,10 @@ Optimizer::PassToken CreateWorkaround1209Pass();
 // Creates a pass that converts if-then-else like assignments into OpSelect.
 Optimizer::PassToken CreateIfConversionPass();
 
+// Creates a pass that will replace instructions that are not valid for the
+// current shader stage by constants.  Has no effect on non-shader modules.
+Optimizer::PassToken CreateReplaceInvalidOpcodePass();
+
 }  // namespace spvtools
 
 #endif  // SPIRV_TOOLS_OPTIMIZER_HPP_