Initial -embed-spirv support (#4974)

* Initial -embed-spirv support

Add support for SPIR-V precompilation using the framework
established for DXIL.

Work on #4883

* SLANG_UNUSED

* Add linkage attributes to exported spirv functions

* Combine DXIL and SPIRV paths

* Whitespace fix

* Merge remaining precompiled spirv/dxil paths

* Change inst accessors to return codegentarget

* Add unit test for precompiled spirv

---------

Co-authored-by: Yong He <yonghe@outlook.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/tests/library/precompiled-module-library-resource.slang b/tests/library/precompiled-module-library-resource.slang
index 3eeab39d8..35b83b72f 100644
--- a/tests/library/precompiled-module-library-resource.slang
+++ b/tests/library/precompiled-module-library-resource.slang
@@ -1,9 +1,11 @@
 // precompiled-module-library-resource.slang
 
-// Compile this library source with -embed-dxil option. Tests that modules can be
-// precompiled to dxil despite having resource parameters or return types.
+// Compile this library source with embedded DXIL and SPIRV options.
+// Tests that modules can be precompiled to downstream IR despite having resource
+// parameters or return types.
 
-//TEST(windows):COMPILE: tests/library/precompiled-module-library-resource.slang -o tests/library/precompiled-module-library-resource.slang-module -embed-dxil -profile lib_6_6 -incomplete-library
+//TEST(windows):COMPILE: tests/library/precompiled-module-library-resource.slang -o tests/library/precompiled-module-library-resource-dxil.slang-module -target dxil -embed-downstream-ir -profile lib_6_6 -incomplete-library
+//TEST:COMPILE: tests/library/precompiled-module-library-resource.slang -o tests/library/precompiled-module-library-resource-spv.slang-module -target spirv -embed-downstream-ir -incomplete-library
 
 module "precompiled-module-library-resource";
 
@@ -26,13 +28,13 @@ public int resource_in_struct_parameter(ResourceStruct rs)
     return rs.buffer[0];
 }
 
-internal int matrix_in_parameter_internal(int1x1 matrix)
+internal float matrix_in_parameter_internal(float2x2 matrix)
 {
     return matrix[0][0];
 }
 
-public int matrix_in_parameter_public(int a)
+public float matrix_in_parameter_public(float a)
 {
-    int1x1 matrix = {a};
+    float2x2 matrix = {a, .2, .3, .4};
     return matrix_in_parameter_internal(matrix);
 }