[DirectX][ShaderFlags] Add analysis for WaveOps flag

- add Shader Flag analysis for the `WaveOps` flag in DXILShaderFlags.cpp
- add testing of all currenlty supported wave ops in wave-ops.ll

Author: inbelic

llvm/lib/Target/DirectX/DXILShaderFlags.cpp

@@ -30,6 +30,39 @@
 using namespace llvm;
 using namespace llvm::dxil;
 
+static bool checkWaveOps(Intrinsic::ID IID) {
+  switch (IID) {
+  default: return false;
+  case Intrinsic::dx_wave_is_first_lane:
+  case Intrinsic::dx_wave_getlaneindex:
+  case Intrinsic::dx_wave_any:
+  case Intrinsic::dx_wave_all:
+  case Intrinsic::dx_wave_readlane:
+  case Intrinsic::dx_wave_active_countbits:
+  // Wave Active Op Variants
+  case Intrinsic::dx_wave_reduce_sum:
+  case Intrinsic::dx_wave_reduce_usum:
+  case Intrinsic::dx_wave_reduce_max:
+  case Intrinsic::dx_wave_reduce_umax:
+
+  // Currently unsupported intrinsics
+  // case Intrinsic::dx_WaveGetLaneCount:
+  // case Intrinsic::dx_WaveActiveAllEqual:
+  // case Intrinsic::dx_WaveActiveBallot:
+  // case Intrinsic::dx_WaveReadLaneFirst:
+  // case Intrinsic::dx_WaveActiveBit:
+  // case Intrinsic::dx_WavePrefixOp:
+  // case Intrinsic::dx_QuadReadLaneAt:
+  // case Intrinsic::dx_QuadOp:
+  // case Intrinsic::dx_WavePrefixBitCount:
+  // case Intrinsic::dx_WaveMatch:
+  // case Intrinsic::dx_WaveMultiPrefixOp:
+  // case Intrinsic::dx_WaveMultiPrefixBitCount:
+  // case Intrinsic::dx_QuadVote:
+    return true;
+  }
+}
+
 /// Update the shader flags mask based on the given instruction.
 /// \param CSF Shader flags mask to update.
 /// \param I Instruction to check.
@@ -92,6 +125,8 @@ void ModuleShaderFlags::updateFunctionFlags(ComputedShaderFlags &CSF,
 
     // TODO: Set DX11_1_DoubleExtensions if I is a call to DXIL intrinsic
     // DXIL::Opcode::Fma https://github.com/llvm/llvm-project/issues/114554
+
+    CSF.WaveOps |= checkWaveOps(CI->getIntrinsicID());
   }
 }
 

llvm/test/CodeGen/DirectX/ShaderFlags/wave-ops.ll

@@ -0,0 +1,79 @@
+; RUN: opt -S --passes="print-dx-shader-flags" 2>&1 %s | FileCheck %s
+;
+; CHECK: ; Shader Flags Value: [[WAVE_FLAG:0x00080000]]
+; CHECK: ; Note: shader requires additional functionality:
+; CHECK-NEXT: ;       Wave level operations
+; CHECK-NEXT: ; Note: extra DXIL module flags:
+; CHECK-NEXT: {{^;$}}
+
+target triple = "dxil-pc-shadermodel6.7-library"
+
+define noundef i1 @wave_is_first_lane() {
+entry:
+  ; CHECK: Function wave_is_first_lane : [[WAVE_FLAG]]
+  %ret = call i1 @llvm.dx.wave.is.first.lane()
+  ret i1 %ret
+}
+
+define noundef i32 @wave_getlaneindex() {
+entry:
+  ; CHECK: Function wave_getlaneindex : [[WAVE_FLAG]]
+  %ret = call i32 @llvm.dx.wave.getlaneindex()
+  ret i32 %ret
+}
+
+define noundef i1 @wave_any(i1 %x) {
+entry:
+  ; CHECK: Function wave_any : [[WAVE_FLAG]]
+  %ret = call i1 @llvm.dx.wave.any(i1 %x)
+  ret i1 %ret
+}
+
+define noundef i1 @wave_all(i1 %x) {
+entry:
+  ; CHECK: Function wave_all : [[WAVE_FLAG]]
+  %ret = call i1 @llvm.dx.wave.all(i1 %x)
+  ret i1 %ret
+}
+
+define noundef i1 @wave_readlane(i1 %x, i32 %idx) {
+entry:
+  ; CHECK: Function wave_readlane : [[WAVE_FLAG]]
+  %ret = call i1 @llvm.dx.wave.readlane.i1(i1 %x, i32 %idx)
+  ret i1 %ret
+}
+
+define noundef i32 @wave_reduce_sum(i32 noundef %x) {
+entry:
+  ; CHECK: Function wave_reduce_sum : [[WAVE_FLAG]]
+  %ret = call i32 @llvm.dx.wave.reduce.sum.i32(i32 %x)
+  ret i32 %ret
+}
+
+define noundef i32 @wave_reduce_usum(i32 noundef %x) {
+entry:
+  ; CHECK: Function wave_reduce_usum : [[WAVE_FLAG]]
+  %ret = call i32 @llvm.dx.wave.reduce.usum.i32(i32 %x)
+  ret i32 %ret
+}
+
+define noundef i32 @wave_reduce_max(i32 noundef %x) {
+entry:
+  ; CHECK: Function wave_reduce_max : [[WAVE_FLAG]]
+  %ret = call i32 @llvm.dx.wave.reduce.max.i32(i32 %x)
+  ret i32 %ret
+}
+
+define noundef i32 @wave_reduce_umax(i32 noundef %x) {
+entry:
+  ; CHECK: Function wave_reduce_umax : [[WAVE_FLAG]]
+  %ret = call i32 @llvm.dx.wave.reduce.umax.i32(i32 %x)
+  ret i32 %ret
+}
+
+define void @wave_active_countbits(i1 %expr) {
+entry:
+  ; CHECK: Function wave_active_countbits : [[WAVE_FLAG]]
+  %0 = call i32 @llvm.dx.wave.active.countbits(i1 %expr)
+  ret void
+}