[all-commits] [llvm/llvm-project] c61b07: [clang][bytecode] Use `CopyArray` for primitive Ar...

[Timm Baeder via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c61b070ec2d5f42faf26d961b85b070c0b5ebe5c
      https://github.com/llvm/llvm-project/commit/c61b070ec2d5f42faf26d961b85b070c0b5ebe5c
  Author: Timm Baeder <tbaeder at redhat.com>
  Date:   2026-04-14 (Tue, 14 Apr 2026)

  Changed paths:
    M clang/lib/AST/ByteCode/Compiler.cpp

  Log Message:
  -----------
  [clang][bytecode] Use `CopyArray` for primitive ArrayInitLoops (#191956)

This reduces the bytecode output for the copy constructor of a struct
such as:

```c++
struct Buffer {
  struct {
    char D[N];
  } V;

  Buffer() = default;
};
```
from
```
Buffer<5>::(unnamed struct)::(unnamed struct at array.cpp:873:3) 0x7d38d2de3f80
frame size: 104
arg size:   96
rvo:        0
this arg:   1
0      GetPtrThisField          16
16     GetParamPtr              0
32     GetPtrFieldPop           16
48     InitScope                0
64     SetLocalPtr              40
80     GetLocalPtr              40
96     ArrayDecay
104    ExpandPtr
112    ConstUint64              0
128    ArrayElemPtrPopUint64
136    LoadPopSint8
144    InitElemSint8            0
160    GetLocalPtr              40
176    ArrayDecay
184    ExpandPtr
192    ConstUint64              1
208    ArrayElemPtrPopUint64
216    LoadPopSint8
224    InitElemSint8            1
240    GetLocalPtr              40
256    ArrayDecay
264    ExpandPtr
272    ConstUint64              2
288    ArrayElemPtrPopUint64
296    LoadPopSint8
304    InitElemSint8            2
320    GetLocalPtr              40
336    ArrayDecay
344    ExpandPtr
352    ConstUint64              3
368    ArrayElemPtrPopUint64
376    LoadPopSint8
384    InitElemSint8            3
400    GetLocalPtr              40
416    ArrayDecay
424    ExpandPtr
432    ConstUint64              4
448    ArrayElemPtrPopUint64
456    LoadPopSint8
464    InitElemSint8            4
480    FinishInitPop
488    Destroy                  0
504    Destroy                  0
520    RetVoid
```
(where `N = 5`).

to:
```
Buffer<5>::(unnamed struct)::(unnamed struct at array.cpp:873:3) 0x7c85b9fe3f80
frame size: 0
arg size:   96
rvo:        0
this arg:   1
0     GetPtrThisField    16
16    GetParamPtr        0
32    GetPtrFieldPop     16
48    CopyArraySint8     0 0 5
80    FinishInitPop
88    RetVoid
```



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