Allow CPP/CUDA/Metal to lower/legalize buffer-elements to support column_major/row_major. (#4653)

* Allow CPP/CUDA/Metal to legalize their buffer-elements.

Fixes: #4537

Changes:
1. Matrix inputs require legalization (pack/unpack) to ensure consistent row_major/column_major throughout entire shader, the following enabled legalization pass fixes this.
2. Added missing CUDA intrinsic so CUDA can run more tests.
3. Added a memory packing test since this still fails for cpp/cuda/metal (due to having no memory packing enforcement).

* change memory packing tests to run for targets without packing

---------

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

1 files changed, 6 insertions, 0 deletions

diff --git a/prelude/slang-cuda-prelude.h b/prelude/slang-cuda-prelude.h
index 74a9d0cec..89f33e24b 100644
--- a/prelude/slang-cuda-prelude.h
+++ b/prelude/slang-cuda-prelude.h
@@ -207,6 +207,12 @@ union Union64
     double d;
 };
 
+template<typename T>
+SLANG_FORCE_INLINE SLANG_CUDA_CALL float make_float(T val)
+{
+    return (float)val;
+}
+
 SLANG_FORCE_INLINE SLANG_CUDA_CALL float _slang_fmod(float x, float y)
 {
     return ::fmodf(x, y);