[CIR][ThroughMLIR] Add TanOp Lowering (llvm#1540)

Adds implementation for TanOp's lowering via ThroughMLIR.

Author: goxul

clang/lib/CIR/Lowering/ThroughMLIR/LowerCIRToMLIR.cpp

@@ -316,6 +316,18 @@ class CIRCosOpLowering : public mlir::OpConversionPattern<cir::CosOp> {
   }
 };
 
+class CIRTanOpLowering : public mlir::OpConversionPattern<cir::TanOp> {
+public:
+  using OpConversionPattern<cir::TanOp>::OpConversionPattern;
+
+  mlir::LogicalResult
+  matchAndRewrite(cir::TanOp op, OpAdaptor adaptor,
+                  mlir::ConversionPatternRewriter &rewriter) const override {
+    rewriter.replaceOpWithNewOp<mlir::math::TanOp>(op, adaptor.getSrc());
+    return mlir::LogicalResult::success();
+  }
+};
+
 class CIRSqrtOpLowering : public mlir::OpConversionPattern<cir::SqrtOp> {
 public:
   using mlir::OpConversionPattern<cir::SqrtOp>::OpConversionPattern;
@@ -1446,8 +1458,8 @@ void populateCIRToMLIRConversionPatterns(mlir::RewritePatternSet &patterns,
            CIRBitClrsbOpLowering, CIRBitFfsOpLowering, CIRBitParityOpLowering,
            CIRIfOpLowering, CIRVectorCreateLowering, CIRVectorInsertLowering,
            CIRVectorExtractLowering, CIRVectorCmpOpLowering, CIRACosOpLowering,
-           CIRASinOpLowering, CIRUnreachableOpLowering>(converter,
-                                                        patterns.getContext());
+           CIRASinOpLowering, CIRUnreachableOpLowering, CIRTanOpLowering>(
+          converter, patterns.getContext());
 }
 
 static mlir::TypeConverter prepareTypeConverter() {

clang/test/CIR/Lowering/ThroughMLIR/tan.cir

@@ -0,0 +1,30 @@
+// RUN: cir-opt %s -cir-to-mlir -o %t.mlir
+// RUN: FileCheck %s --input-file %t.mlir
+
+module {
+  cir.func @foo() {
+    %1 = cir.const #cir.fp<1.0> : !cir.float
+    %2 = cir.const #cir.fp<2.0> : !cir.double
+    %3 = cir.const #cir.fp<3.0> : !cir.long_double<!cir.f80>
+    %4 = cir.const #cir.fp<4.0> : !cir.long_double<!cir.double>
+    %5 = cir.tan %1 : !cir.float
+    %6 = cir.tan %2 : !cir.double
+    %7 = cir.tan %3 : !cir.long_double<!cir.f80>
+    %8 = cir.tan %4 : !cir.long_double<!cir.double>
+    cir.return
+  }
+}
+
+// CHECK:      module {
+// CHECK-NEXT:   func.func @foo() {
+// CHECK-NEXT:     %[[C0:.+]] = arith.constant 1.000000e+00 : f32
+// CHECK-NEXT:     %[[C1:.+]] = arith.constant 2.000000e+00 : f64
+// CHECK-NEXT:     %[[C2:.+]] = arith.constant 3.000000e+00 : f80
+// CHECK-NEXT:     %[[C3:.+]] = arith.constant 4.000000e+00 : f64
+// CHECK-NEXT:     %{{.+}} = math.tan %[[C0]] : f32
+// CHECK-NEXT:     %{{.+}} = math.tan %[[C1]] : f64
+// CHECK-NEXT:     %{{.+}} = math.tan %[[C2]] : f80
+// CHECK-NEXT:     %{{.+}} = math.tan %[[C3]] : f64
+// CHECK-NEXT:     return
+// CHECK-NEXT:   }
+// CHECK-NEXT: }