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LibWasm: Use builtins for clz, ctz, and popcnt

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BrandonKi 2021-06-01 14:26:17 -04:00 committed by Ali Mohammad Pur
parent e53df2ca9d
commit 0d1481be7d
Notes: sideshowbarker 2024-07-18 16:59:09 +09:00 
Author: https://github.com/BrandonKi
Commit: https://github.com/SerenityOS/serenity/commit/0d1481be7dd
Pull-request: https://github.com/SerenityOS/serenity/pull/7671
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/tomuta
1 changed files with 34 additions and 2 deletions
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36
Userland/Libraries/LibWasm/AbstractMachine/Interpreter.cpp
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@ -368,6 +368,34 @@ ALWAYS_INLINE static T rotr(T value, R shift)
return (value >> shift) | (value << ((-shift) & mask));
}
template<typename T>
ALWAYS_INLINE static i32 clz(T value)
{
if (value == 0)
return sizeof(T) * CHAR_BIT;
if constexpr (sizeof(T) == 4)
return __builtin_clz(value);
else if constexpr (sizeof(T) == 8)
return __builtin_clzll(value);
else
VERIFY_NOT_REACHED();
}
template<typename T>
ALWAYS_INLINE static i32 ctz(T value)
{
if (value == 0)
return sizeof(T) * CHAR_BIT;
if constexpr (sizeof(T) == 4)
return __builtin_ctz(value);
else if constexpr (sizeof(T) == 8)
return __builtin_ctzll(value);
else
VERIFY_NOT_REACHED();
}
void BytecodeInterpreter::interpret(Configuration& configuration, InstructionPointer& ip, const Instruction& instruction)
{
dbgln_if(WASM_TRACE_DEBUG, "Executing instruction {} at ip {}", instruction_name(instruction.opcode()), ip.value());
@ -717,9 +745,11 @@ void BytecodeInterpreter::interpret(Configuration& configuration, InstructionPoi
case Instructions::f64_ge.value():
BINARY_NUMERIC_OPERATION(double, >, i32);
case Instructions::i32_clz.value():
UNARY_NUMERIC_OPERATION(i32, clz);
case Instructions::i32_ctz.value():
UNARY_NUMERIC_OPERATION(i32, ctz);
case Instructions::i32_popcnt.value():
goto unimplemented;
UNARY_NUMERIC_OPERATION(i32, __builtin_popcount);
case Instructions::i32_add.value():
BINARY_NUMERIC_OPERATION(i32, +, i32);
case Instructions::i32_sub.value():
@ -751,9 +781,11 @@ void BytecodeInterpreter::interpret(Configuration& configuration, InstructionPoi
case Instructions::i32_rotr.value():
BINARY_PREFIX_NUMERIC_OPERATION(u32, rotr, i32);
case Instructions::i64_clz.value():
UNARY_NUMERIC_OPERATION(i64, clz);
case Instructions::i64_ctz.value():
UNARY_NUMERIC_OPERATION(i64, ctz);
case Instructions::i64_popcnt.value():
goto unimplemented;
UNARY_NUMERIC_OPERATION(i64, __builtin_popcountll);
case Instructions::i64_add.value():
OVF_CHECKED_BINARY_NUMERIC_OPERATION(i64, +, i64);
case Instructions::i64_sub.value():