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Jit_Integer: arithXex

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MerryMage committed Oct 15, 2018
1 parent 9bf75a0 commit 6ce718b9204c75f96fa26da87f8086bbf0f5cd9b
Showing with 21 additions and 12 deletions.
  1. +21 −12 Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
@@ -1399,8 +1399,6 @@ void Jit64::arithXex(UGeckoInstruction inst)
int d = inst.RD;
bool same_input_sub = !add && regsource && a == b;
gpr.Lock(a, b, d);
gpr.BindToRegister(d, !same_input_sub && (d == a || d == b));
if (!js.carryFlagSet)
JitGetAndClearCAOV(inst.OE);
else
@@ -1410,45 +1408,56 @@ void Jit64::arithXex(UGeckoInstruction inst)
// Special case: subfe A, B, B is a common compiler idiom
if (same_input_sub)
{
RCX64Reg Rd = gpr.Bind(d, RCMode::Write);
RegCache::Realize(Rd);
// Convert carry to borrow
if (!js.carryFlagInverted)
CMC();
SBB(32, gpr.R(d), gpr.R(d));
SBB(32, Rd, Rd);
invertedCarry = true;
}
else if (!add && regsource && d == b)
{
RCOpArg Ra = gpr.Use(a, RCMode::Read);
RCX64Reg Rd = gpr.Bind(d, RCMode::ReadWrite);
RegCache::Realize(Ra, Rd);
if (!js.carryFlagInverted)
CMC();
SBB(32, gpr.R(d), gpr.R(a));
SBB(32, Rd, Ra);
invertedCarry = true;
}
else
{
OpArg source = regsource ? gpr.R(d == b ? a : b) : Imm32(mex ? 0xFFFFFFFF : 0);
RCOpArg Ra = gpr.Use(a, RCMode::Read);
RCOpArg Rb = gpr.Use(b, RCMode::Read);
RCX64Reg Rd = gpr.Bind(d, RCMode::Write);
RCOpArg source =
regsource ? gpr.Use(d == b ? a : b, RCMode::Read) : RCOpArg::Imm32(mex ? 0xFFFFFFFF : 0);
RegCache::Realize(Ra, Rb, Rd, source);
if (d != a && d != b)
MOV(32, gpr.R(d), gpr.R(a));
MOV(32, Rd, Ra);
if (!add)
NOT(32, gpr.R(d));
NOT(32, Rd);
// if the source is an immediate, we can invert carry by going from add -> sub and doing src =
// -1 - src
if (js.carryFlagInverted && source.IsImm())
{
source = Imm32(-1 - source.SImm32());
SBB(32, gpr.R(d), source);
SBB(32, Rd, Imm32(-1 - source.SImm32()));
invertedCarry = true;
}
else
{
if (js.carryFlagInverted)
CMC();
ADC(32, gpr.R(d), source);
ADC(32, Rd, source);
}
}
FinalizeCarryOverflow(inst.OE, invertedCarry);
if (inst.Rc)
ComputeRC(gpr.R(d));
gpr.UnlockAll();
ComputeRC(d);
}
void Jit64::arithcx(UGeckoInstruction inst)

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