| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This contains code to emit Builtin calls as CIR or a function call to be |
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| 10 | // later resolved. |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | #include "CIRGenCall.h" |
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| 15 | #include "CIRGenFunction.h" |
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| 16 | #include "CIRGenModule.h" |
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| 17 | #include "CIRGenValue.h" |
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| 18 | #include "mlir/IR/BuiltinAttributes.h" |
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| 19 | #include "mlir/IR/Value.h" |
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| 20 | #include "mlir/Support/LLVM.h" |
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| 21 | #include "clang/AST/Expr.h" |
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| 22 | #include "clang/AST/GlobalDecl.h" |
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| 23 | #include "llvm/Support/ErrorHandling.h" |
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| 24 | |
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| 25 | using namespace clang; |
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| 26 | using namespace clang::CIRGen; |
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| 27 | |
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| 28 | RValue CIRGenFunction::emitBuiltinExpr(const GlobalDecl &gd, unsigned builtinID, |
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| 29 | const CallExpr *e, |
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| 30 | ReturnValueSlot returnValue) { |
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| 31 | // See if we can constant fold this builtin. If so, don't emit it at all. |
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| 32 | // TODO: Extend this handling to all builtin calls that we can constant-fold. |
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| 33 | Expr::EvalResult result; |
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| 34 | if (e->isPRValue() && e->EvaluateAsRValue(result, cgm.getASTContext()) && |
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| 35 | !result.hasSideEffects()) { |
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| 36 | if (result.Val.isInt()) { |
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| 37 | return RValue::get(builder.getConstInt(getLoc(e->getSourceRange()), |
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| 38 | result.Val.getInt())); |
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| 39 | } |
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| 40 | if (result.Val.isFloat()) { |
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| 41 | // Note: we are using result type of CallExpr to determine the type of |
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| 42 | // the constant. Classic codegen uses the result value to determine the |
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| 43 | // type. We feel it should be Ok to use expression type because it is |
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| 44 | // hard to imagine a builtin function evaluates to a value that |
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| 45 | // over/underflows its own defined type. |
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| 46 | mlir::Type type = convertType(e->getType()); |
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| 47 | return RValue::get(builder.getConstFP(getLoc(e->getExprLoc()), type, |
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| 48 | result.Val.getFloat())); |
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| 49 | } |
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| 50 | } |
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| 51 | |
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| 52 | mlir::Location loc = getLoc(e->getExprLoc()); |
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| 53 | cgm.errorNYI(loc, "non constant foldable builtin calls" ); |
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| 54 | return getUndefRValue(ty: e->getType()); |
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| 55 | } |
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| 56 | |
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