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LibWasm: Implement saturating float truncation instructions

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With these, the only remaining unimplemented instructions are the
following:
- memory.init
- data.drop
- memory.copy
- memory.fill
- table.init
- elem.drop
- table.copy
- table.grow
- table.size
- table.fill
This commit is contained in:
Ali Mohammad Pur 2021-06-09 17:14:23 +04:30 committed by Ali Mohammad Pur
parent 3a44011cd4
commit 45710d0724
Notes: sideshowbarker 2024-07-18 12:32:03 +09:00 
Author: https://github.com/alimpfard
Commit: https://github.com/SerenityOS/serenity/commit/45710d07245
Pull-request: https://github.com/SerenityOS/serenity/pull/7950
1 changed files with 34 additions and 0 deletions
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34
Userland/Libraries/LibWasm/AbstractMachine/BytecodeInterpreter.cpp
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@ -403,6 +403,32 @@ ALWAYS_INLINE static OutputT extend_signed(InputT value)
return value;
}
template<typename TruncT, typename T>
ALWAYS_INLINE static TruncT saturating_truncate(T value)
{
if (isnan(value))
return 0;
if (isinf(value)) {
if (value < 0)
return NumericLimits<TruncT>::min();
return NumericLimits<TruncT>::max();
}
constexpr auto convert = [](auto truncated_value) {
if (truncated_value < NumericLimits<TruncT>::min())
return NumericLimits<TruncT>::min();
if (static_cast<double>(truncated_value) > static_cast<double>(NumericLimits<TruncT>::max()))
return NumericLimits<TruncT>::max();
return static_cast<TruncT>(truncated_value);
};
if constexpr (IsSame<T, float>)
return convert(truncf(value));
else
return convert(trunc(value));
}
template<typename T>
ALWAYS_INLINE static T float_max(T lhs, T rhs)
{
@ -988,13 +1014,21 @@ void BytecodeInterpreter::interpret(Configuration& configuration, InstructionPoi
case Instructions::i64_extend32_s.value():
UNARY_MAP(i64, (extend_signed<i32, i64>), i64);
case Instructions::i32_trunc_sat_f32_s.value():
UNARY_MAP(float, saturating_truncate<i32>, i32);
case Instructions::i32_trunc_sat_f32_u.value():
UNARY_MAP(float, saturating_truncate<u32>, i32);
case Instructions::i32_trunc_sat_f64_s.value():
UNARY_MAP(double, saturating_truncate<i32>, i32);
case Instructions::i32_trunc_sat_f64_u.value():
UNARY_MAP(double, saturating_truncate<u32>, i32);
case Instructions::i64_trunc_sat_f32_s.value():
UNARY_MAP(float, saturating_truncate<i64>, i64);
case Instructions::i64_trunc_sat_f32_u.value():
UNARY_MAP(float, saturating_truncate<u64>, i64);
case Instructions::i64_trunc_sat_f64_s.value():
UNARY_MAP(double, saturating_truncate<i64>, i64);
case Instructions::i64_trunc_sat_f64_u.value():
UNARY_MAP(double, saturating_truncate<u64>, i64);
case Instructions::memory_init.value():
case Instructions::data_drop.value():
case Instructions::memory_copy.value():