[HLSL] Finish exposing half types and intrinsics always (#132804)

We previously made an implementation error when adding half overloads
for HLSL library functionality. The half type is always defined in HLSL
and half intrinsics should not be conditionally included.
When native 16-bit types are disabled half is a unique 32-bit float type
with lesser promotion rank than float.

Apply pattern #81782 to intrinsics added in #95999.
Closes #132793

Author: spall

clang/lib/Headers/hlsl/hlsl_alias_intrinsics.h

@@ -134,16 +134,18 @@ double4 abs(double4);
 /// \brief Returns the arccosine of the input value, \a Val.
 /// \param Val The input value.
 
-#ifdef __HLSL_ENABLE_16_BIT
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_acos)
 half acos(half);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_acos)
 half2 acos(half2);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_acos)
 half3 acos(half3);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_acos)
 half4 acos(half4);
-#endif
 
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_acos)
 float acos(float);
@@ -447,16 +449,18 @@ double4 asdouble(uint4, uint4);
 /// \brief Returns the arcsine of the input value, \a Val.
 /// \param Val The input value.
 
-#ifdef __HLSL_ENABLE_16_BIT
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_asin)
 half asin(half);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_asin)
 half2 asin(half2);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_asin)
 half3 asin(half3);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_asin)
 half4 asin(half4);
-#endif
 
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_asin)
 float asin(float);
@@ -475,16 +479,18 @@ float4 asin(float4);
 /// \brief Returns the arctangent of the input value, \a Val.
 /// \param Val The input value.
 
-#ifdef __HLSL_ENABLE_16_BIT
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_atan)
 half atan(half);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_atan)
 half2 atan(half2);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_atan)
 half3 atan(half3);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_atan)
 half4 atan(half4);
-#endif
 
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_atan)
 float atan(float);
@@ -505,16 +511,18 @@ float4 atan(float4);
 /// \param y The y-coordinate.
 /// \param x The x-coordinate.
 
-#ifdef __HLSL_ENABLE_16_BIT
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_atan2)
 half atan2(half y, half x);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_atan2)
 half2 atan2(half2 y, half2 x);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_atan2)
 half3 atan2(half3 y, half3 x);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_atan2)
 half4 atan2(half4 y, half4 x);
-#endif
 
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_atan2)
 float atan2(float y, float x);
@@ -721,16 +729,18 @@ float4 cos(float4);
 /// \brief Returns the hyperbolic cosine of the input value, \a Val.
 /// \param Val The input value.
 
-#ifdef __HLSL_ENABLE_16_BIT
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_cosh)
 half cosh(half);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_cosh)
 half2 cosh(half2);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_cosh)
 half3 cosh(half3);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_cosh)
 half4 cosh(half4);
-#endif
 
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_cosh)
 float cosh(float);
@@ -2124,16 +2134,18 @@ float4 sin(float4);
 /// \brief Returns the hyperbolic sine of the input value, \a Val.
 /// \param Val The input value.
 
-#ifdef __HLSL_ENABLE_16_BIT
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_sinh)
 half sinh(half);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_sinh)
 half2 sinh(half2);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_sinh)
 half3 sinh(half3);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_sinh)
 half4 sinh(half4);
-#endif
 
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_sinh)
 float sinh(float);
@@ -2215,16 +2227,18 @@ float4 step(float4, float4);
 /// \brief Returns the tangent of the input value, \a Val.
 /// \param Val The input value.
 
-#ifdef __HLSL_ENABLE_16_BIT
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_tan)
 half tan(half);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_tan)
 half2 tan(half2);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_tan)
 half3 tan(half3);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_tan)
 half4 tan(half4);
-#endif
 
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_tan)
 float tan(float);
@@ -2243,16 +2257,18 @@ float4 tan(float4);
 /// \brief Returns the hyperbolic tangent of the input value, \a Val.
 /// \param Val The input value.
 
-#ifdef __HLSL_ENABLE_16_BIT
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_tanh)
 half tanh(half);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_tanh)
 half2 tanh(half2);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_tanh)
 half3 tanh(half3);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_tanh)
 half4 tanh(half4);
-#endif
 
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_tanh)
 float tanh(float);