Reviewers: danno, Paul Lind, kisg,
Description:
MIPS: Branch delay slot and other optimizations.
List of changes:
-added a minor optimization to the Simulator that quickly skips nops in the
delay slot
-slightly re-worked CEntryStub to save a few instructions
CEntryStub now expects the following values:
-s0: number of arguments including receiver
-s1: size of arguments excluding receiver
-s2: pointer to builtin function
Two new MacroAssembler functions were added to make usage more convenient:
-PrepareCEntryArgs(int num_args) to set up s0 and s1
-PrepareCEntryFunction(const ExternalReference&) to set up s2
-removed branch delay slot nops from the most frequently used code areas
-reorganized some code to execute fewer instructions
-utilized the delay slot of most Ret instructions
This does not cover all Rets, only the most obvious cases.
Also added a special version of DropAndRet that utilizes the delay slot.
-added some comments to code areas where explanation of the register/delay
slot
usage may be needed
-added an optimization to Jump so it doesn't always pre-load the target
register
BUG=
TEST=
Please review this at http://codereview.chromium.org/9699071/
Affected files:
M src/mips/builtins-mips.cc
M src/mips/code-stubs-mips.cc
M src/mips/debug-mips.cc
M src/mips/ic-mips.cc
M src/mips/lithium-codegen-mips.cc
M src/mips/macro-assembler-mips.h
M src/mips/macro-assembler-mips.cc
M src/mips/simulator-mips.h
M src/mips/stub-cache-mips.cc
--
v8-dev mailing list
[email protected]
http://groups.google.com/group/v8-dev
