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30 lines
1.4 KiB
Plaintext
30 lines
1.4 KiB
Plaintext
-----------------------------------------------------------------------------
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Notes on performance
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-----------------------------------------------------------------------------
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The intent of this file is to record progress in improving performance.
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-----------------------------------------------------------------------------
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Just before 3.1.0:
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- Julian made LibVEX_Alloc() inlinable. Saved a couple of percent.
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- Julian started building Vex at -O2. Saved up to 8% or so(?) in some
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cases.
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Post 3.1.0:
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- Julian made the tree builder linear. Saved 2--13% on a range of programs.
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- Nick improved vg_SP_update_pass() to identify more small constant
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increments/decrements of SP, so the fast cases can be used more often.
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Saved 1--3% on a few programs.
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- r5345,r5346: Julian improved the dispatcher so that x86 and AMD64 use
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jumps instead of call/return for calling translations, and also removed
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the --profile-flags profiling from the dispatcher unless --profile-flags
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is being used. Improved Nulgrind performance typically by 10--20%,
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and Memcheck performance typically by 2--20%.
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COMPVBITS branch:
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- Nick converted to compress V bits, initial version saved 0--5% on most
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cases, with a 30% improvement on one case (tsim_arch) which calls
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set_address_range_perms() a lot.
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- Nick rewrote set_address_range_perms(), which gained 0--3% typically,
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and 22% on tsim_arch.
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