commit | 339e0c804ec60347d401a09bb62182dabb7ee54c | [log] [tgz] |
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author | oth <oth@chromium.org> | Wed Oct 21 15:28:55 2015 |
committer | Commit bot <commit-bot@chromium.org> | Wed Oct 21 15:29:23 2015 |
tree | 81856b7c9b7403e33c6b8b42ddb75d96691e78f0 | |
parent | 14ba9c3dea3ea6a597a63511fbed5190e74480bd [diff] |
[Interpreter] Reduce temporary register usage in generated bytecode. This change adds new flavors of Visit() methods for obtaining expression results: - VisitForAccumulatorValue() which places result in the accumulator. - VisitForRegisterValue() which places the result in a register. - VisitForEffect() which evaluates the expression and discards the result. The targets of these calls place the expression result with result_scope()->SetResultInRegister() or result_scope()->SetResultInAccumulator(). By being smarter about result locations, there's less temporary register usage. However, we now have a hazard with assignments in binary expressions that didn't exist before. This change detects and DCHECK's when a hazard is detected. A follow on CL will address this. There are consequential changes to test-bytecode-generator.cc and this change also adds new bytecode macros A(x, n) and THIS(n) for register file entries for arguments and this. BUG=v8:4280 LOG=NO Review URL: https://codereview.chromium.org/1392933002 Cr-Commit-Position: refs/heads/master@{#31445}
V8 is Google's open source JavaScript engine.
V8 implements ECMAScript as specified in ECMA-262.
V8 is written in C++ and is used in Google Chrome, the open source browser from Google.
V8 can run standalone, or can be embedded into any C++ application.
V8 Project page: https://code.google.com/p/v8/
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