Re-enable slang-test for WGSL (shader-slang#5120)

My previous commit disabled the WGSL test by a mistake. This commit fixes the mistake and run the slang-test for WGSL tests.

frexp and modf were still not working for the vector types.

source/slang/hlsl.meta.slang

@@ -8686,6 +8686,7 @@ vector<T, N> fract(vector<T, N> x)
 // Split float into mantissa and exponent
 __generic<T : __BuiltinFloatingPointType>
 [__readNone]
+[ForceInline]
 [require(cpp_cuda_glsl_hlsl_metal_spirv_wgsl, sm_4_0_version)]
 T frexp(T x, out int exp)
 {
@@ -8708,14 +8709,16 @@ T frexp(T x, out int exp)
 
 __generic<T : __BuiltinFloatingPointType>
 [__readNone]
+[ForceInline]
 [require(wgsl)]
 void __wgsl_frexp(T x, out T fract, out int exp)
 {
-    __intrinsic_asm "{ var s = frexp($0); $1 = s.fract; $2 = s.exp; }";
+    __intrinsic_asm "{ var s = frexp($0); (*($1)) = s.fract; (*($2)) = s.exp; }";
 }
 
 __generic<T : __BuiltinFloatingPointType, let N : int>
 [__readNone]
+[ForceInline]
 [require(cpp_cuda_glsl_hlsl_metal_spirv_wgsl, sm_4_0_version)]
 vector<T, N> frexp(vector<T, N> x, out vector<int, N> exp)
 {
@@ -8727,13 +8730,27 @@ vector<T, N> frexp(vector<T, N> x, out vector<int, N> exp)
     case spirv: return spirv_asm {
         result:$$vector<T, N> = OpExtInst glsl450 Frexp $x &exp
     };
+    case wgsl:
+        vector<T,N> fract;
+        __wgsl_frexp<T>(x, fract, exp);
+        return fract;
     default:
         VECTOR_MAP_BINARY(T, N, frexp, x, exp);
     }
 }
 
+__generic<T : __BuiltinFloatingPointType, let N : int>
+[__readNone]
+[ForceInline]
+[require(wgsl)]
+void __wgsl_frexp(vector<T, N> x, out vector<T, N> fract, out vector<int, N> exp)
+{
+    __intrinsic_asm "{ var s = frexp($0); (*($1)) = s.fract; (*($2)) = s.exp; }";
+}
+
 __generic<T : __BuiltinFloatingPointType, let N : int, let M : int, let L : int>
 [__readNone]
+[ForceInline]
 [require(cpp_cuda_glsl_hlsl_metal_spirv_wgsl, sm_4_0_version)]
 matrix<T, N, M> frexp(matrix<T, N, M> x, out matrix<int, N, M, L> exp)
 {
@@ -11099,6 +11116,7 @@ vector<T,N> fmedian3(vector<T,N> x, vector<T,N> y, vector<T,N> z)
 // split into integer and fractional parts (both with same sign)
 __generic<T : __BuiltinFloatingPointType>
 [__readNone]
+[ForceInline]
 [require(cpp_cuda_glsl_hlsl_metal_spirv_wgsl, sm_4_0_version)]
 T modf(T x, out T ip)
 {
@@ -11121,14 +11139,16 @@ T modf(T x, out T ip)
 
 __generic<T : __BuiltinFloatingPointType>
 [__readNone]
+[ForceInline]
 [require(wgsl)]
 void __wgsl_modf(T x, out T fract, out T whole)
 {
-    __intrinsic_asm "{ var s = modf($0); $1 = s.fract; $2 = s.whole; }";
+    __intrinsic_asm "{ var s = modf($0); (*($1)) = s.fract; (*($2)) = s.whole; }";
 }
 
 __generic<T : __BuiltinFloatingPointType, let N : int>
 [__readNone]
+[ForceInline]
 [require(cpp_cuda_glsl_hlsl_metal_spirv_wgsl, sm_4_0_version)]
 vector<T,N> modf(vector<T,N> x, out vector<T,N> ip)
 {
@@ -11140,13 +11160,27 @@ vector<T,N> modf(vector<T,N> x, out vector<T,N> ip)
     case spirv: return spirv_asm {
         result:$$vector<T,N> = OpExtInst glsl450 Modf $x &ip
     };
+    case wgsl:
+        vector<T,N> fract;
+        __wgsl_modf<T>(x, fract, ip);
+        return fract;
     default:
         VECTOR_MAP_BINARY(T, N, modf, x, ip);
     }
 }
 
+__generic<T : __BuiltinFloatingPointType, let N : int>
+[__readNone]
+[ForceInline]
+[require(wgsl)]
+void __wgsl_modf(vector<T,N> x, out vector<T,N> fract, out vector<T,N> whole)
+{
+    __intrinsic_asm "{ var s = modf($0); (*($1)) = s.fract; (*($2)) = s.whole; }";
+}
+
 __generic<T : __BuiltinFloatingPointType, let N : int, let M : int, let L : int>
 [__readNone]
+[ForceInline]
 [require(cpp_cuda_glsl_hlsl_metal_spirv_wgsl, sm_4_0_version)]
 matrix<T,N,M> modf(matrix<T,N,M> x, out matrix<T,N,M,L> ip)
 {
@@ -20624,4 +20658,4 @@ extension<T, L : IBufferDataLayout> RWStructuredBuffer<T, L> : IRWArray<T>
 extension<T, L : IBufferDataLayout> RasterizerOrderedStructuredBuffer<T, L> : IRWArray<T>
 {
     int getCount() { uint count; uint stride; this.GetDimensions(count, stride); return count; }
-}
+}

tools/slang-test/slang-test-main.cpp

@@ -968,6 +968,7 @@ static PassThroughFlags _getPassThroughFlagsForTarget(SlangCompileTarget target)
         case SLANG_HOST_CPP_SOURCE:
         case SLANG_CUDA_SOURCE:
         case SLANG_METAL:
+        case SLANG_WGSL:
         {
             return 0;
         }
@@ -993,11 +994,6 @@ static PassThroughFlags _getPassThroughFlagsForTarget(SlangCompileTarget target)
             return PassThroughFlag::Metal;
         }
 
-	case SLANG_WGSL:
-	{
-            return PassThroughFlag::WGSL;
-	}
-
         case SLANG_SHADER_HOST_CALLABLE:
         case SLANG_HOST_HOST_CALLABLE: