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data_processing_bitfield: Move datasize variables after early-exit conditionals

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Moves the declaration of datasize to the scope that it's used within.
This also takes the opportunity to apply const where applicable, and
make early-exits all vertically consistent with one another.
This commit is contained in:
Lioncash 2018-09-17 00:53:38 -04:00 committed by MerryMage
parent 2e0fcd6161
commit f4a66d2477
1 changed files with 44 additions and 29 deletions
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73
src/frontend/A64/translate/impl/data_processing_bitfield.cpp
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@ -15,64 +15,79 @@ static IR::U32U64 ReplicateBit(IREmitter& ir, const IR::U32U64& value, u8 bit_po
}
bool TranslatorVisitor::SBFM(bool sf, bool N, Imm<6> immr, Imm<6> imms, Reg Rn, Reg Rd) {
size_t datasize = sf ? 64 : 32;
if (sf && !N) {
return ReservedValue();
}
if (sf && !N) return ReservedValue();
if (!sf && (N || immr.Bit<5>() || imms.Bit<5>())) return ReservedValue();
if (!sf && (N || immr.Bit<5>() || imms.Bit<5>())) {
return ReservedValue();
}
u8 R = immr.ZeroExtend<u8>();
u8 S = imms.ZeroExtend<u8>();
auto masks = DecodeBitMasks(N, imms, immr, false);
if (!masks) return ReservedValue();
const u8 R = immr.ZeroExtend<u8>();
const u8 S = imms.ZeroExtend<u8>();
const auto masks = DecodeBitMasks(N, imms, immr, false);
if (!masks) {
return ReservedValue();
}
auto src = X(datasize, Rn);
const size_t datasize = sf ? 64 : 32;
const auto src = X(datasize, Rn);
auto bot = ir.And(ir.RotateRight(src, ir.Imm8(R)), I(datasize, masks->wmask));
auto top = ReplicateBit(ir, src, S);
top = ir.And(top, I(datasize, ~masks->tmask));
bot = ir.And(bot, I(datasize, masks->tmask));
X(datasize, Rd, ir.Or(top, bot));
X(datasize, Rd, ir.Or(top, bot));
return true;
}
bool TranslatorVisitor::BFM(bool sf, bool N, Imm<6> immr, Imm<6> imms, Reg Rn, Reg Rd) {
size_t datasize = sf ? 64 : 32;
if (sf && !N) {
return ReservedValue();
}
if (sf && !N) return ReservedValue();
if (!sf && (N || immr.Bit<5>() || imms.Bit<5>())) return ReservedValue();
if (!sf && (N || immr.Bit<5>() || imms.Bit<5>())) {
return ReservedValue();
}
u8 R = immr.ZeroExtend<u8>();
auto masks = DecodeBitMasks(N, imms, immr, false);
if (!masks) return ReservedValue();
const u8 R = immr.ZeroExtend<u8>();
const auto masks = DecodeBitMasks(N, imms, immr, false);
if (!masks) {
return ReservedValue();
}
auto dst = X(datasize, Rd);
auto src = X(datasize, Rn);
const size_t datasize = sf ? 64 : 32;
const auto dst = X(datasize, Rd);
const auto src = X(datasize, Rn);
auto bot = ir.Or(ir.And(dst, I(datasize, ~masks->wmask)), ir.And(ir.RotateRight(src, ir.Imm8(R)), I(datasize, masks->wmask)));
const auto bot = ir.Or(ir.And(dst, I(datasize, ~masks->wmask)), ir.And(ir.RotateRight(src, ir.Imm8(R)), I(datasize, masks->wmask)));
X(datasize, Rd, ir.Or(ir.And(dst, I(datasize, ~masks->tmask)), ir.And(bot, I(datasize, masks->tmask))));
return true;
}
bool TranslatorVisitor::UBFM(bool sf, bool N, Imm<6> immr, Imm<6> imms, Reg Rn, Reg Rd) {
size_t datasize = sf ? 64 : 32;
if (sf && !N) {
return ReservedValue();
}
if (sf && !N) return ReservedValue();
if (!sf && (N || immr.Bit<5>() || imms.Bit<5>())) return ReservedValue();
if (!sf && (N || immr.Bit<5>() || imms.Bit<5>())) {
return ReservedValue();
}
u8 R = immr.ZeroExtend<u8>();
auto masks = DecodeBitMasks(N, imms, immr, false);
if (!masks) return ReservedValue();
const u8 R = immr.ZeroExtend<u8>();
const auto masks = DecodeBitMasks(N, imms, immr, false);
if (!masks) {
return ReservedValue();
}
auto src = X(datasize, Rn);
auto bot = ir.And(ir.RotateRight(src, ir.Imm8(R)), I(datasize, masks->wmask));
const size_t datasize = sf ? 64 : 32;
const auto src = X(datasize, Rn);
const auto bot = ir.And(ir.RotateRight(src, ir.Imm8(R)), I(datasize, masks->wmask));
X(datasize, Rd, ir.And(bot, I(datasize, masks->tmask)));
return true;
}