ArithToEmitC: Support using opaque types for floating point

mlir/include/mlir/Dialect/EmitC/IR/EmitC.h

@@ -46,6 +46,10 @@ bool isIntegerIndexOrOpaqueType(Type type);
 /// Determines whether \p type is a valid floating-point type in EmitC.
 bool isSupportedFloatType(mlir::Type type);
 
+/// Determines whether \p type is a valid floating-point or opaque type in
+/// EmitC.
+bool isFloatOrOpaqueType(mlir::Type type);
+
 /// Determines whether \p type is a emitc.size_t/ssize_t type.
 bool isPointerWideType(mlir::Type type);
 

mlir/lib/Conversion/ArithToEmitC/ArithToEmitC.cpp

@@ -307,7 +307,7 @@ class NegFOpConversion : public OpConversionPattern<arith::NegFOp> {
           "negf currently only supports scalar types, not vectors or tensors");
     }
 
-    if (!emitc::isSupportedFloatType(adaptedOpType)) {
+    if (!emitc::isFloatOrOpaqueType(adaptedOpType)) {
       return rewriter.notifyMatchFailure(
           op.getLoc(), "floating-point type is not supported by EmitC");
     }
@@ -655,7 +655,7 @@ class FtoICastOpConversion : public OpConversionPattern<CastOp> {
                   ConversionPatternRewriter &rewriter) const override {
 
     Type operandType = adaptor.getIn().getType();
-    if (!emitc::isSupportedFloatType(operandType))
+    if (!emitc::isFloatOrOpaqueType(operandType))
       return rewriter.notifyMatchFailure(castOp,
                                          "unsupported cast source type");
 
@@ -710,7 +710,7 @@ class ItoFCastOpConversion : public OpConversionPattern<CastOp> {
     if (!dstType)
       return rewriter.notifyMatchFailure(castOp, "type conversion failed");
 
-    if (!emitc::isSupportedFloatType(dstType))
+    if (!emitc::isFloatOrOpaqueType(dstType))
       return rewriter.notifyMatchFailure(castOp,
                                          "unsupported cast destination type");
 
@@ -745,15 +745,15 @@ class TruncFConversion : public OpConversionPattern<arith::TruncFOp> {
     // attribute that we need to check. For now, the behavior is the default,
     // i.e. truncate.
     Type operandType = adaptor.getIn().getType();
-    if (!emitc::isSupportedFloatType(operandType))
+    if (!emitc::isFloatOrOpaqueType(operandType))
       return rewriter.notifyMatchFailure(castOp,
                                          "unsupported cast source type");
 
     Type dstType = this->getTypeConverter()->convertType(castOp.getType());
     if (!dstType)
       return rewriter.notifyMatchFailure(castOp, "type conversion failed");
 
-    if (!emitc::isSupportedFloatType(dstType))
+    if (!emitc::isFloatOrOpaqueType(dstType))
       return rewriter.notifyMatchFailure(castOp,
                                          "unsupported cast destination type");
 
@@ -775,15 +775,15 @@ class ExtFConversion : public OpConversionPattern<arith::ExtFOp> {
   matchAndRewrite(arith::ExtFOp castOp, typename arith::ExtFOp::Adaptor adaptor,
                   ConversionPatternRewriter &rewriter) const override {
     Type operandType = adaptor.getIn().getType();
-    if (!emitc::isSupportedFloatType(operandType))
+    if (!emitc::isFloatOrOpaqueType(operandType))
       return rewriter.notifyMatchFailure(castOp,
                                          "unsupported cast source type");
 
     Type dstType = this->getTypeConverter()->convertType(castOp.getType());
     if (!dstType)
       return rewriter.notifyMatchFailure(castOp, "type conversion failed");
 
-    if (!emitc::isSupportedFloatType(dstType))
+    if (!emitc::isFloatOrOpaqueType(dstType))
       return rewriter.notifyMatchFailure(castOp,
                                          "unsupported cast destination type");
 

mlir/lib/Dialect/EmitC/IR/EmitC.cpp

@@ -119,6 +119,10 @@ bool mlir::emitc::isSupportedFloatType(Type type) {
   return isa<Float32Type, Float64Type>(type);
 }
 
+bool mlir::emitc::isFloatOrOpaqueType(Type type) {
+  return isa<emitc::OpaqueType>(type) || isSupportedFloatType(type);
+}
+
 bool mlir::emitc::isPointerWideType(Type type) {
   return isa<emitc::SignedSizeTType, emitc::SizeTType, emitc::PtrDiffTType>(
       type);