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LibJS/JIT: Use the x86_64 setcc instruction to remove a branch
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parent
1d76738dde
commit
d3b3e49e19
3 changed files with 17 additions and 16 deletions
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@ -569,6 +569,14 @@ struct X86_64Assembler {
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jump_if(condition, label);
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}
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void set_if(Condition condition, Operand dst)
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{
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emit_rex_for_slash(dst, REX_W::No);
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emit8(0x0f);
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emit8(0x90 | to_underlying(condition));
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emit_modrm_slash(0, dst);
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}
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void sign_extend_32_to_64_bits(Reg reg)
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{
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mov32(Operand::Register(reg), Operand::Register(reg), Extension::SignExtend);
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@ -1098,27 +1098,19 @@ void Compiler::compile_mul(Bytecode::Op::Mul const& op)
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Assembler::Label end {}; \
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\
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branch_if_both_int32(ARG1, ARG2, [&] { \
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Assembler::Label true_case {}; \
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\
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m_assembler.sign_extend_32_to_64_bits(ARG1); \
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m_assembler.sign_extend_32_to_64_bits(ARG2); \
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\
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m_assembler.jump_if( \
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/* accumulator = SHIFTED_BOOLEAN_TAG | (arg1 condition arg2) */ \
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m_assembler.mov( \
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Assembler::Operand::Register(GPR0), \
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Assembler::Operand::Imm(SHIFTED_BOOLEAN_TAG)); \
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m_assembler.cmp( \
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Assembler::Operand::Register(ARG1), \
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Assembler::Operand::Register(ARG2)); \
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m_assembler.set_if( \
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Assembler::Condition::AssemblerCondition, \
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Assembler::Operand::Register(ARG2), \
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true_case); \
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\
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m_assembler.mov( \
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Assembler::Operand::Register(GPR0), \
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Assembler::Operand::Imm(Value(false).encoded())); \
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store_accumulator(GPR0); \
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m_assembler.jump(end); \
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\
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true_case.link(m_assembler); \
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m_assembler.mov( \
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Assembler::Operand::Register(GPR0), \
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Assembler::Operand::Imm(Value(true).encoded())); \
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Assembler::Operand::Register(GPR0)); /* sets only first byte */ \
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store_accumulator(GPR0); \
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\
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m_assembler.jump(end); \
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@ -104,6 +104,7 @@ static_assert((EMPTY_TAG & IS_NULLISH_EXTRACT_PATTERN) != IS_NULLISH_PATTERN);
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static constexpr u64 TAG_EXTRACTION = 0xFFFF000000000000;
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static constexpr u64 TAG_SHIFT = 48;
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static constexpr u64 SHIFTED_BOOLEAN_TAG = BOOLEAN_TAG << TAG_SHIFT;
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static constexpr u64 SHIFTED_INT32_TAG = INT32_TAG << TAG_SHIFT;
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static constexpr u64 SHIFTED_IS_CELL_PATTERN = IS_CELL_PATTERN << TAG_SHIFT;
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