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We already had IC support in PutById for the following cases:
- Changing an existing own property
- Calling a setter located in the prototype chain
This was enough to speed up code where structurally identical objects
(same shape) are processed in a loop:
```js
const arr = [{ a: 1 }, { a: 2 }, { a: 3 }];
for (let obj of arr) {
obj.a += 1;
}
```
However, creating structurally identical objects in a loop was still
slow:
```js
for (let i = 0; i < 10_000_000; i++) {
const o = {};
o.a = 1;
o.b = 2;
o.c = 3;
}
```
This change addresses that by adding a new IC type that caches both the
source and target shapes, allowing property additions to be fast-pathed
by directly jumping to the shape that already includes the new property.
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|---|---|---|
| .. | ||
| ASTCodegen.cpp | ||
| BasicBlock.cpp | ||
| BasicBlock.h | ||
| Builtins.cpp | ||
| Builtins.h | ||
| CodeGenerationError.cpp | ||
| CodeGenerationError.h | ||
| Executable.cpp | ||
| Executable.h | ||
| Generator.cpp | ||
| Generator.h | ||
| IdentifierTable.cpp | ||
| IdentifierTable.h | ||
| Instruction.cpp | ||
| Instruction.h | ||
| Interpreter.cpp | ||
| Interpreter.h | ||
| Label.cpp | ||
| Label.h | ||
| Op.h | ||
| Operand.h | ||
| RegexTable.cpp | ||
| RegexTable.h | ||
| Register.h | ||
| ScopedOperand.cpp | ||
| ScopedOperand.h | ||
| StringTable.cpp | ||
| StringTable.h | ||