7be64db45f
This is a reland of cf93071c91
Original change's description:
> [interpreter] Short Star bytecode
>
> Design doc:
> https://docs.google.com/document/d/1g_NExMT78II_KnIYNa9MvyPYIj23qAiFUEsyemY5KRk/edit
>
> This change adds 16 new interpreter opcodes, kStar0 through kStar15, so
> that we can use a single byte to represent the common operation of
> storing to a low-numbered register. This generally reduces the quantity
> of bytecode generated on web sites by 8-9%.
>
> In order to not degrade speed, a couple of other changes are required:
>
> The existing lookahead logic to check for Star after certain other
> bytecode handlers is updated to check for these new short Star codes
> instead. Furthermore, that lookahead logic is updated to contain its own
> copy of the dispatch jump rather than merging control flow with the
> lookahead-failed case, to improve branch prediction.
>
> A bunch of constants use bytecode size in bytes as a proxy for the size
> or complexity of a function, and are adjusted downward proportionally to
> the decrease in generated bytecode size.
>
> Other small drive-by fix: update generate-bytecode-expectations to emit
> \n instead of \r\n on Windows.
>
> Change-Id: I6307c2b0f5794a3a1088bb0fb94f6e1615441ed5
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2641180
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#72773}
Change-Id: I1afb670c25694498b3989de615858f984a8c7f6f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698057
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72821}
280 lines
6.0 KiB
Plaintext
280 lines
6.0 KiB
Plaintext
#
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# Autogenerated by generate-bytecode-expectations.
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#
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---
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wrap: yes
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---
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snippet: "
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var a = 1; return ++a;
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"
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frame size: 1
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parameter count: 1
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bytecode array length: 7
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bytecodes: [
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/* 42 S> */ B(LdaSmi), I8(1),
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B(Star0),
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/* 45 S> */ B(Inc), U8(0),
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B(Star0),
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/* 56 S> */ B(Return),
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]
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constant pool: [
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]
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handlers: [
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]
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---
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snippet: "
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var a = 1; return a++;
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"
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frame size: 2
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parameter count: 1
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bytecode array length: 12
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bytecodes: [
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/* 42 S> */ B(LdaSmi), I8(1),
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B(Star0),
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/* 45 S> */ B(ToNumeric), U8(0),
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B(Star1),
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B(Inc), U8(0),
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B(Star0),
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B(Ldar), R(1),
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/* 56 S> */ B(Return),
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]
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constant pool: [
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]
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handlers: [
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]
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---
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snippet: "
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var a = 1; return --a;
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"
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frame size: 1
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parameter count: 1
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bytecode array length: 7
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bytecodes: [
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/* 42 S> */ B(LdaSmi), I8(1),
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B(Star0),
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/* 45 S> */ B(Dec), U8(0),
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B(Star0),
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/* 56 S> */ B(Return),
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]
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constant pool: [
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]
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handlers: [
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]
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---
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snippet: "
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var a = 1; return a--;
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"
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frame size: 2
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parameter count: 1
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bytecode array length: 12
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bytecodes: [
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/* 42 S> */ B(LdaSmi), I8(1),
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B(Star0),
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/* 45 S> */ B(ToNumeric), U8(0),
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B(Star1),
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B(Dec), U8(0),
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B(Star0),
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B(Ldar), R(1),
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/* 56 S> */ B(Return),
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]
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constant pool: [
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]
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handlers: [
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]
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---
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snippet: "
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var a = { val: 1 }; return a.val++;
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"
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frame size: 4
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parameter count: 1
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bytecode array length: 22
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bytecodes: [
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/* 42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(41),
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B(Star0),
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/* 54 S> */ B(LdaNamedProperty), R(0), U8(1), U8(1),
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B(ToNumeric), U8(3),
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B(Star2),
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B(Inc), U8(3),
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B(Star3),
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/* 66 E> */ B(StaNamedProperty), R(0), U8(1), U8(4),
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B(Ldar), R(2),
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/* 69 S> */ B(Return),
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]
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constant pool: [
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OBJECT_BOILERPLATE_DESCRIPTION_TYPE,
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["val"],
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]
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handlers: [
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]
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---
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snippet: "
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var a = { val: 1 }; return --a.val;
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"
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frame size: 3
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parameter count: 1
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bytecode array length: 19
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bytecodes: [
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/* 42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(41),
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B(Star0),
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/* 54 S> */ B(LdaNamedProperty), R(0), U8(1), U8(1),
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B(Dec), U8(3),
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B(Star2),
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/* 65 E> */ B(StaNamedProperty), R(0), U8(1), U8(4),
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B(Ldar), R(2),
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/* 69 S> */ B(Return),
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]
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constant pool: [
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OBJECT_BOILERPLATE_DESCRIPTION_TYPE,
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["val"],
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]
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handlers: [
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]
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---
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snippet: "
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var name = 'var'; var a = { val: 1 }; return a[name]--;
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"
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frame size: 6
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parameter count: 1
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bytecode array length: 26
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bytecodes: [
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/* 45 S> */ B(LdaConstant), U8(0),
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B(Star0),
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/* 60 S> */ B(CreateObjectLiteral), U8(1), U8(0), U8(41),
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B(Star1),
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/* 72 S> */ B(Ldar), R(0),
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/* 81 E> */ B(LdaKeyedProperty), R(1), U8(1),
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B(ToNumeric), U8(3),
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B(Star4),
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B(Dec), U8(3),
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B(Star5),
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/* 86 E> */ B(StaKeyedProperty), R(1), R(0), U8(4),
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B(Ldar), R(4),
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/* 89 S> */ B(Return),
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]
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constant pool: [
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["var"],
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OBJECT_BOILERPLATE_DESCRIPTION_TYPE,
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]
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handlers: [
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]
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---
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snippet: "
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var name = 'var'; var a = { val: 1 }; return ++a[name];
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"
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frame size: 5
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parameter count: 1
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bytecode array length: 23
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bytecodes: [
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/* 45 S> */ B(LdaConstant), U8(0),
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B(Star0),
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/* 60 S> */ B(CreateObjectLiteral), U8(1), U8(0), U8(41),
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B(Star1),
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/* 72 S> */ B(Ldar), R(0),
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/* 83 E> */ B(LdaKeyedProperty), R(1), U8(1),
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B(Inc), U8(3),
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B(Star4),
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/* 87 E> */ B(StaKeyedProperty), R(1), R(0), U8(4),
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B(Ldar), R(4),
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/* 89 S> */ B(Return),
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]
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constant pool: [
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["var"],
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OBJECT_BOILERPLATE_DESCRIPTION_TYPE,
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]
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handlers: [
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]
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---
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snippet: "
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var a = 1; var b = function() { return a }; return ++a;
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"
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frame size: 2
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parameter count: 1
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bytecode array length: 21
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bytecodes: [
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/* 30 E> */ B(CreateFunctionContext), U8(0), U8(1),
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B(PushContext), R(1),
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/* 42 S> */ B(LdaSmi), I8(1),
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/* 42 E> */ B(StaCurrentContextSlot), U8(2),
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/* 53 S> */ B(CreateClosure), U8(1), U8(0), U8(2),
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B(Star0),
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/* 78 S> */ B(LdaCurrentContextSlot), U8(2),
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B(Inc), U8(0),
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/* 87 E> */ B(StaCurrentContextSlot), U8(2),
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/* 89 S> */ B(Return),
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]
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constant pool: [
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SCOPE_INFO_TYPE,
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SHARED_FUNCTION_INFO_TYPE,
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]
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handlers: [
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]
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---
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snippet: "
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var a = 1; var b = function() { return a }; return a--;
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"
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frame size: 3
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parameter count: 1
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bytecode array length: 26
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bytecodes: [
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/* 30 E> */ B(CreateFunctionContext), U8(0), U8(1),
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B(PushContext), R(1),
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/* 42 S> */ B(LdaSmi), I8(1),
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/* 42 E> */ B(StaCurrentContextSlot), U8(2),
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/* 53 S> */ B(CreateClosure), U8(1), U8(0), U8(2),
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B(Star0),
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/* 78 S> */ B(LdaCurrentContextSlot), U8(2),
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B(ToNumeric), U8(0),
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B(Star2),
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B(Dec), U8(0),
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/* 86 E> */ B(StaCurrentContextSlot), U8(2),
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B(Ldar), R(2),
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/* 89 S> */ B(Return),
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]
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constant pool: [
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SCOPE_INFO_TYPE,
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SHARED_FUNCTION_INFO_TYPE,
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]
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handlers: [
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]
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---
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snippet: "
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var idx = 1; var a = [1, 2]; return a[idx++] = 2;
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"
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frame size: 5
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parameter count: 1
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bytecode array length: 26
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bytecodes: [
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/* 44 S> */ B(LdaSmi), I8(1),
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B(Star0),
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/* 55 S> */ B(CreateArrayLiteral), U8(0), U8(0), U8(37),
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B(Star1),
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/* 63 S> */ B(Ldar), R(0),
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B(ToNumeric), U8(1),
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B(Star3),
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B(Inc), U8(1),
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B(Star0),
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B(LdaSmi), I8(2),
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B(Star4),
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/* 79 E> */ B(StaKeyedProperty), R(1), R(3), U8(2),
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B(Ldar), R(4),
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/* 83 S> */ B(Return),
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]
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constant pool: [
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ARRAY_BOILERPLATE_DESCRIPTION_TYPE,
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]
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handlers: [
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]
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