cf93071c91
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}
57 lines
1.0 KiB
Plaintext
57 lines
1.0 KiB
Plaintext
#
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# Autogenerated by generate-bytecode-expectations.
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#
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---
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wrap: no
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test function name: f
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---
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snippet: "
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function t() { }
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function f() { return t(); }
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f();
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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: 8
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bytecodes: [
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/* 32 S> */ B(LdaGlobal), U8(0), U8(0),
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B(Star0),
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/* 39 E> */ B(CallUndefinedReceiver0), R(0), U8(2),
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/* 43 S> */ B(Return),
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]
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constant pool: [
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["t"],
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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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function t(a, b, c) { }
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function f() { return t(1, 2, 3); }
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f();
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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: 19
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bytecodes: [
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/* 39 S> */ B(LdaGlobal), U8(0), U8(0),
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B(Star0),
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B(LdaSmi), I8(1),
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B(Star1),
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B(LdaSmi), I8(2),
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B(Star2),
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B(LdaSmi), I8(3),
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B(Star3),
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/* 46 E> */ B(CallUndefinedReceiver), R(0), R(1), U8(3), U8(2),
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/* 57 S> */ B(Return),
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]
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constant pool: [
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["t"],
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]
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handlers: [
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]
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