Implement `uint2` variant of `asdouble` intrinsic (#4488)

* Implement asdouble2 intrinsic and tests

Fixes #4437

Adds a new asdouble2 intrinsic for all platforms except Metal.
Extends the test for asdouble to test asdouble2 as well.

1 files changed, 14 insertions, 0 deletions

diff --git a/source/slang/hlsl.meta.slang b/source/slang/hlsl.meta.slang
index d9e7b9d66..909bebb0d 100644
--- a/source/slang/hlsl.meta.slang
+++ b/source/slang/hlsl.meta.slang
@@ -5695,6 +5695,20 @@ double asdouble(uint lowbits, uint highbits)
     }
 }
 
+__glsl_extension(GL_ARB_gpu_shader5)
+[__readNone]
+[require(cpp_cuda_glsl_hlsl_spirv, shader5_sm_5_0)]
+double2 asdouble(uint2 lowbits, uint2 highbits)
+{
+    __target_switch
+    {
+    case hlsl:
+        __intrinsic_asm "asdouble($0, $1)";
+    default:
+        return double2(asdouble(lowbits.x, highbits.x), asdouble(lowbits.y, highbits.y));
+    }
+}
+
 // Reinterpret bits as a float (HLSL SM 4.0)
 
 [__readNone]