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LibJS/JIT: Add fast path for cached GetVariable accesses

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We can now stay in machine code for environment variable read accesses
as long as they are cached and initialized.

20% speed-up on Octane/zlib.js :^)
This commit is contained in:
Andreas Kling 2023-11-06 15:23:49 +01:00
parent 7826c006c1
commit 1d8ec677a3
6 changed files with 147 additions and 3 deletions
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1
Userland/Libraries/LibJS/JIT/Compiler.h
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@ -27,6 +27,7 @@ private:
# if ARCH(X86_64)
static constexpr auto GPR0 = Assembler::Reg::RAX;
static constexpr auto GPR1 = Assembler::Reg::RCX;
static constexpr auto GPR2 = Assembler::Reg::R12;
static constexpr auto ARG0 = Assembler::Reg::RDI;
static constexpr auto ARG1 = Assembler::Reg::RSI;
static constexpr auto ARG2 = Assembler::Reg::RDX;