GlobalISel: Add MIRBuilder wrappers for bitcount instructions

Various expansions use these.

llvm-svn: 361018

2 files changed, 52 insertions, 0 deletions

diff --git a/llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h b/llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
index f48843441ff..e45a07d231b 100644
--- a/llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
+++ b/llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
@@ -1256,6 +1256,31 @@ public:
     return buildInstr(TargetOpcode::G_XOR, {Dst}, {Src0, NegOne});
   }
 
+  /// Build and insert \p Res = G_CTPOP \p Op0, \p Src0
+  MachineInstrBuilder buildCTPOP(const DstOp &Dst, const SrcOp &Src0) {
+    return buildInstr(TargetOpcode::G_CTPOP, {Dst}, {Src0});
+  }
+
+  /// Build and insert \p Res = G_CTLZ \p Op0, \p Src0
+  MachineInstrBuilder buildCTLZ(const DstOp &Dst, const SrcOp &Src0) {
+    return buildInstr(TargetOpcode::G_CTLZ, {Dst}, {Src0});
+  }
+
+  /// Build and insert \p Res = G_CTLZ_ZERO_UNDEF \p Op0, \p Src0
+  MachineInstrBuilder buildCTLZ_ZERO_UNDEF(const DstOp &Dst, const SrcOp &Src0) {
+    return buildInstr(TargetOpcode::G_CTLZ_ZERO_UNDEF, {Dst}, {Src0});
+  }
+
+  /// Build and insert \p Res = G_CTTZ \p Op0, \p Src0
+  MachineInstrBuilder buildCTTZ(const DstOp &Dst, const SrcOp &Src0) {
+    return buildInstr(TargetOpcode::G_CTTZ, {Dst}, {Src0});
+  }
+
+  /// Build and insert \p Res = G_CTTZ_ZERO_UNDEF \p Op0, \p Src0
+  MachineInstrBuilder buildCTTZ_ZERO_UNDEF(const DstOp &Dst, const SrcOp &Src0) {
+    return buildInstr(TargetOpcode::G_CTTZ_ZERO_UNDEF, {Dst}, {Src0});
+  }
+
   /// Build and insert \p Res = G_FADD \p Op0, \p Op1
   MachineInstrBuilder buildFAdd(const DstOp &Dst, const SrcOp &Src0,
                                 const SrcOp &Src1) {
diff --git a/llvm/unittests/CodeGen/GlobalISel/MachineIRBuilderTest.cpp b/llvm/unittests/CodeGen/GlobalISel/MachineIRBuilderTest.cpp
index aec6d46b3c0..c696620958d 100644
--- a/llvm/unittests/CodeGen/GlobalISel/MachineIRBuilderTest.cpp
+++ b/llvm/unittests/CodeGen/GlobalISel/MachineIRBuilderTest.cpp
@@ -202,3 +202,30 @@ TEST_F(GISelMITest, BuildXor) {
 
   EXPECT_TRUE(CheckMachineFunction(*MF, CheckStr)) << *MF;
 }
+
+TEST_F(GISelMITest, BuildBitCounts) {
+  if (!TM)
+    return;
+
+  LLT S32 = LLT::scalar(32);
+  SmallVector<unsigned, 4> Copies;
+  collectCopies(Copies, MF);
+
+  B.buildCTPOP(S32, Copies[0]);
+  B.buildCTLZ(S32, Copies[0]);
+  B.buildCTLZ_ZERO_UNDEF(S32, Copies[1]);
+  B.buildCTTZ(S32, Copies[0]);
+  B.buildCTTZ_ZERO_UNDEF(S32, Copies[1]);
+
+  auto CheckStr = R"(
+  ; CHECK: [[COPY0:%[0-9]+]]:_(s64) = COPY $x0
+  ; CHECK: [[COPY1:%[0-9]+]]:_(s64) = COPY $x1
+  ; CHECK: [[CTPOP:%[0-9]+]]:_(s32) = G_CTPOP [[COPY0]]:_
+  ; CHECK: [[CTLZ0:%[0-9]+]]:_(s32) = G_CTLZ [[COPY0]]:_
+  ; CHECK: [[CTLZ_UNDEF0:%[0-9]+]]:_(s32) = G_CTLZ_ZERO_UNDEF [[COPY1]]:_
+  ; CHECK: [[CTTZ:%[0-9]+]]:_(s32) = G_CTTZ [[COPY0]]:_
+  ; CHECK: [[CTTZ_UNDEF0:%[0-9]+]]:_(s32) = G_CTTZ_ZERO_UNDEF [[COPY1]]:_
+  )";
+
+  EXPECT_TRUE(CheckMachineFunction(*MF, CheckStr)) << *MF;
+}