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A64: Implement SSHR (scalar)

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Lioncash 2018-04-12 14:36:07 -04:00 committed by MerryMage
parent 6723b00497
commit 255a33936d
2 changed files with 21 additions and 7 deletions
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2
src/frontend/A64/decoder/a64.inc
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@ -467,7 +467,7 @@ INST(SUB_1, "SUB (vector)", "01111
//INST(SQRDMULH_vec_1, "SQRDMULH (vector)", "01111110zz1mmmmm101101nnnnnddddd")
// Data Processing - FP and SIMD - SIMD Scalar shift by immediate
//INST(SSHR_1, "SSHR", "010111110IIIIiii000001nnnnnddddd")
INST(SSHR_1, "SSHR", "010111110IIIIiii000001nnnnnddddd")
//INST(SSRA_1, "SSRA", "010111110IIIIiii000101nnnnnddddd")
//INST(SRSHR_1, "SRSHR", "010111110IIIIiii001001nnnnnddddd")
//INST(SRSRA_1, "SRSRA", "010111110IIIIiii001101nnnnnddddd")

26
src/frontend/A64/translate/impl/simd_scalar_shift_by_immediate.cpp
View file

@ -13,15 +13,20 @@ enum class ShiftExtraBehavior {
Accumulate,
};
enum class Signedness {
Signed,
Unsigned,
};
static void ShiftRight(TranslatorVisitor& v, Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd,
ShiftExtraBehavior behavior) {
ShiftExtraBehavior behavior, Signedness signedness) {
const size_t esize = 64;
const u8 shift_amount = static_cast<u8>((esize * 2) - concatenate(immh, immb).ZeroExtend());
const IR::U64 operand = v.V_scalar(esize, Vn);
IR::U64 result = [&] {
if (shift_amount == esize) {
return v.ir.Imm64(0);
IR::U64 result = [&]() -> IR::U64 {
if (signedness == Signedness::Signed) {
return v.ir.ArithmeticShiftRight(operand, v.ir.Imm8(shift_amount));
}
return v.ir.LogicalShiftRight(operand, v.ir.Imm8(shift_amount));
}();
@ -34,6 +39,15 @@ static void ShiftRight(TranslatorVisitor& v, Imm<4> immh, Imm<3> immb, Vec Vn, V
v.V_scalar(esize, Vd, result);
}
bool TranslatorVisitor::SSHR_1(Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd) {
if (!immh.Bit<3>()) {
return ReservedValue();
}
ShiftRight(*this, immh, immb, Vn, Vd, ShiftExtraBehavior::None, Signedness::Signed);
return true;
}
bool TranslatorVisitor::SHL_1(Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd) {
if (!immh.Bit<3>()) {
return ReservedValue();
@ -54,7 +68,7 @@ bool TranslatorVisitor::USHR_1(Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd) {
return ReservedValue();
}
ShiftRight(*this, immh, immb, Vn, Vd, ShiftExtraBehavior::None);
ShiftRight(*this, immh, immb, Vn, Vd, ShiftExtraBehavior::None, Signedness::Unsigned);
return true;
}
@ -63,7 +77,7 @@ bool TranslatorVisitor::USRA_1(Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd) {
return ReservedValue();
}
ShiftRight(*this, immh, immb, Vn, Vd, ShiftExtraBehavior::Accumulate);
ShiftRight(*this, immh, immb, Vn, Vd, ShiftExtraBehavior::Accumulate, Signedness::Unsigned);
return true;
}