spirv-opt: (WIP) Eliminate Dead Input Component Pass (#4720)

This adds the --eliminate-dead-input-components pass which currently
removes trailing unused components from input arrays.

Fixes #4532

1 files changed, 7 insertions, 0 deletions

diff --git a/include/spirv-tools/optimizer.hpp b/include/spirv-tools/optimizer.hpp
index 2273e85df..fbbd9bc07 100644
--- a/include/spirv-tools/optimizer.hpp
+++ b/include/spirv-tools/optimizer.hpp
@@ -886,6 +886,13 @@ Optimizer::PassToken CreateAmdExtToKhrPass();
 // propagated into their final positions.
 Optimizer::PassToken CreateInterpolateFixupPass();
 
+// Removes unused components from composite input variables. Current
+// implementation just removes trailing unused components from input arrays.
+// The pass performs best after maximizing dead code removal. A subsequent dead
+// code elimination pass would be beneficial in removing newly unused component
+// types.
+Optimizer::PassToken CreateEliminateDeadInputComponentsPass();
+
 // Creates a convert-to-sampled-image pass to convert images and/or
 // samplers with given pairs of descriptor set and binding to sampled image.
 // If a pair of an image and a sampler have the same pair of descriptor set and