Add intrinsic for `IsHelperLane()` in HLSL (#4471)

Add InHelperLane() intrinsic for HLSL, GLSL, Metal and Spirv.

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/hlsl-intrinsic/helper-lane.slang b/tests/hlsl-intrinsic/helper-lane.slang
new file mode 100644
index 000000000..316bda5f9
--- /dev/null
+++ b/tests/hlsl-intrinsic/helper-lane.slang
@@ -0,0 +1,20 @@
+//TEST:SIMPLE(filecheck=HLSL): -entry main -target hlsl -stage fragment
+//TEST:SIMPLE(filecheck=GLSL): -entry main -target glsl -stage fragment
+//TEST:SIMPLE(filecheck=METAL): -entry main -target metal -stage fragment
+//TEST:SIMPLE(filecheck=SPIRV): -entry main -target spirv -stage fragment
+//TEST:SIMPLE(filecheck=SPIRV): -entry main -target spirv-asm -stage fragment
+
+float4 main() : SV_Target
+{
+    //HLSL: IsHelperLane()
+
+    //GLSL: GL_EXT_demote_to_helper_invocation
+    //GLSL: gl_HelperInvocation()
+
+    //METAL: simd_is_helper_thread()
+
+    //SPIRV: DemoteToHelperInvocation
+    //SPIRV: SPV_EXT_demote_to_helper_invocation
+    //SPIRV: OpIsHelperInvocationEXT
+    return float4(IsHelperLane());
+}