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Fix git push error for protected CLA branch #899

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Merged
colin-home merged 6 commits into from
Mar 29, 2019
Merged

Fix git push error for protected CLA branch #899

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98080f4
Update return values per Pratap
Mar 28, 2019
91dbf5e
Merge pull request #1887 from corob-msft/cr-arm64-fix2
PRMerger20 Mar 28, 2019
4d91206
Tweak ARM64 definition of types returned
Mar 28, 2019
bbaffc2
Merge pull request #1889 from corob-msft/cr-arm64-fix3
PRMerger8 Mar 28, 2019
ac5c04b
Merge pull request #1891 from MicrosoftDocs/master
Taojunshen Mar 29, 2019
9eae102
Merging changes synced from https://github.com/MicrosoftDocs/cpp-docs…
opbld17 Mar 29, 2019
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26 changes: 10 additions & 16 deletions docs/build/arm64-windows-abi-conventions.md
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Expand Up @@ -181,27 +181,21 @@ Integral values are returned in x0.

Floating-point values are returned in s0/d0/v0 as appropriate.

Types returned by value are handled differently depending on whether they have certain properties.
Types returned by value are handled differently depending on whether they have certain properties. Types which have all of these properties,

Types are given a "C" return style if they are aggregate by the C++14 standard definition. That is,
- they're *aggregate* by the C++14 standard definition, that is, they have no user-provided constructors, no private or protected non-static data members, no base classes, and no virtual functions, and
- they have a trivial copy-assignment operator, and
- they have a trivial destructor,

- they have no user-provided constructors, no private or protected non-static data members, no base classes, and no virtual functions,
- they have a trivial copy constructor, and
- they have a trivial destructor.
use the following return style:

All other types are given a "C++" return style.
- Types less than or equal to 8 bytes are returned in x0.
- Types less than or equal to 16 bytes are returned in x0 and x1, with x0 containing the lower-order 8 bytes.
- For types greater than 16 bytes, the caller shall reserve a block of memory of sufficient size and alignment to hold the result. The address of the memory block shall be passed as an additional argument to the function in x8. The callee may modify the result memory block at any point during the execution of the subroutine. The callee isn't required to preserve the value stored in x8.

### C return style
All other types use this convention:

Types less than or equal to 8 bytes are returned in x0.

Types less than or equal to 16 bytes are returned in x0 and x1, with x0 containing the lower-order 8 bytes.

For types greater than 16 bytes, the caller shall reserve a block of memory of sufficient size and alignment to hold the result. The address of the memory block shall be passed as an additional argument to the function in x8. The callee may modify the result memory block at any point during the execution of the subroutine. The callee isn't required to preserve the value stored in x8.

### C++ return style

The caller shall reserve a block of memory of sufficient size and alignment to hold the result. The address of the memory block shall be passed as an additional argument to the function in x0, or x1 if $this is passed in x0. The callee may modify the result memory block at any point during the execution of the subroutine. The callee returns the address of the memory block in x0.
- The caller shall reserve a block of memory of sufficient size and alignment to hold the result. The address of the memory block shall be passed as an additional argument to the function in x0, or x1 if $this is passed in x0. The callee may modify the result memory block at any point during the execution of the subroutine. The callee returns the address of the memory block in x0.

## Stack

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