[HLSL] Adding HLSL `clip` function. (#114588)

Adding HLSL `clip` function.
 - adding llvm intrinsic
 - adding sema checks
 - adding dxil lowering
 - ading spirv lowering
 - adding sema tests
 - adding codegen tests
 - adding lowering tests

Closes #99093

---------

Co-authored-by: Joao Saffran <jderezende@microsoft.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.cpp b/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.cpp
index 0308c56..551c36d 100644
--- a/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.cpp
@@ -633,7 +633,8 @@ void RequirementHandler::initAvailableCapabilities(const SPIRVSubtarget &ST) {
   if (ST.isAtLeastSPIRVVer(VersionTuple(1, 6)))
     addAvailableCaps({Capability::DotProduct, Capability::DotProductInputAll,
                       Capability::DotProductInput4x8Bit,
-                      Capability::DotProductInput4x8BitPacked});
+                      Capability::DotProductInput4x8BitPacked,
+                      Capability::DemoteToHelperInvocation});
 
   // Add capabilities enabled by extensions.
   for (auto Extension : ST.getAllAvailableExtensions()) {
@@ -1419,6 +1420,19 @@ void addInstrRequirements(const MachineInstr &MI,
       Reqs.addCapability(SPIRV::Capability::SplitBarrierINTEL);
     }
     break;
+  case SPIRV::OpKill: {
+    Reqs.addCapability(SPIRV::Capability::Shader);
+  } break;
+  case SPIRV::OpDemoteToHelperInvocation:
+    Reqs.addCapability(SPIRV::Capability::DemoteToHelperInvocation);
+
+    if (ST.canUseExtension(
+            SPIRV::Extension::SPV_EXT_demote_to_helper_invocation)) {
+      if (!ST.isAtLeastSPIRVVer(llvm::VersionTuple(1, 6)))
+        Reqs.addExtension(
+            SPIRV::Extension::SPV_EXT_demote_to_helper_invocation);
+    }
+    break;
   case SPIRV::OpSDot:
   case SPIRV::OpUDot:
     AddDotProductRequirements(MI, Reqs, ST);