1 /*
2  * Copyright 2013, The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *     http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "llvm/IR/Attributes.h"
18 
19 // Shared functionality for legacy function attribute encoding.
encodeLLVMAttributesForBitcode(llvm::AttributeSet A,unsigned i)20 static inline uint64_t encodeLLVMAttributesForBitcode(llvm::AttributeSet A,
21                                                       unsigned i) {
22   uint64_t EncodedAttrs = A.Raw(i) & 0xffff;
23   if (A.hasAttribute(i, llvm::Attribute::Alignment)) {
24     // The alignment is stored as an actual power of 2 value (instead of the
25     // compressed log2 form). It occupies bits 31-16 inclusive.
26     EncodedAttrs |= (A.getParamAlignment(i) << 16);
27   }
28   // There are only 12 remaining attributes (bits 21-32), hence our 0xfff mask.
29   EncodedAttrs |= (A.Raw(i) & (0xfffull << 21))  << 11;
30   return EncodedAttrs;
31 }
32 
33