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Take a swing at three-operand IMUL.

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This commit is contained in:
Thomas Harte
2025-08-02 22:23:34 -04:00
parent b6aae65afd
commit 9dfe59a104
3 changed files with 12 additions and 5 deletions
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5
InstructionSets/x86/Implementation/Arithmetic.hpp
View File

@@ -132,6 +132,7 @@ void imul(
modify_t<IntT> destination_high,
modify_t<IntT> destination_low,
read_t<IntT> source,
read_t<IntT> multiplicand,
ContextT &context
) {
/*
@@ -160,8 +161,8 @@ void imul(
FI;
*/
using sIntT = typename std::make_signed<IntT>::type;
destination_high = IntT((sIntT(destination_low) * sIntT(source)) >> (8 * sizeof(IntT)));
destination_low = IntT(sIntT(destination_low) * sIntT(source));
destination_high = IntT((sIntT(multiplicand) * sIntT(source)) >> (8 * sizeof(IntT)));
destination_low = IntT(sIntT(multiplicand) * sIntT(source));
const auto sign_extension = (destination_low & Numeric::top_bit<IntT>()) ? IntT(~0) : 0;
context.flags.template set_from<Flag::Overflow, Flag::Carry>(destination_high != sign_extension);

11
InstructionSets/x86/Implementation/PerformImplementation.hpp
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@@ -241,7 +241,12 @@ template <
return;
case Operation::MUL: Primitive::mul<IntT>(pair_high(), pair_low(), source_r(), context); return;
case Operation::IMUL_1: Primitive::imul<IntT>(pair_high(), pair_low(), source_r(), context); return;
case Operation::IMUL_1:
Primitive::imul<IntT>(pair_high(), pair_low(), source_r(), pair_low(), context);
return;
case Operation::IMUL_3:
Primitive::imul<IntT>(pair_high(), pair_low(), source_r(), IntT(instruction.operand()), context);
return;
case Operation::DIV: Primitive::div<IntT>(pair_high(), pair_low(), source_r(), context); return;
case Operation::IDIV: Primitive::idiv<false, IntT>(pair_high(), pair_low(), source_r(), context); return;
case Operation::IDIV_REP:
@@ -570,7 +575,6 @@ template <
// LSL
// LTR
// STR
// IMUL_3
// LOADALL
}
@@ -647,7 +651,8 @@ void perform(
// This is reachable only if the data and address size combination in use isn't available
// on the processor model nominated.
assert(false);}
assert(false);
}
//
// Public function; just indirects into a trampoline into a version of perform templated on data and address size.

1
OSBindings/Mac/Clock SignalTests/8088Tests.mm
View File

@@ -258,6 +258,7 @@ NSArray<NSString *> *test_files(const char *const home) {
// @"D4.json.gz", // AAM
// @"F6.7.json.gz", // IDIV byte
// @"F7.7.json.gz", // IDIV word
@"C8.json.gz", // ENTER
]];
NSSet *ignoreList = nil;