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JIT64: faster implementation of mfcr

This commit is contained in:
Fiora 2014-08-06 08:51:25 -04:00
parent d5d5580424
commit 8c71703098
1 changed files with 18 additions and 27 deletions
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45
Source/Core/Core/PowerPC/Jit64/Jit_SystemRegisters.cpp
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@ -277,47 +277,38 @@ void Jit64::mfcr(UGeckoInstruction inst)
JITDISABLE(bJITSystemRegistersOff);
// USES_CR
int d = inst.RD;
gpr.Lock(d);
gpr.KillImmediate(d, false, true);
XOR(32, R(EAX), R(EAX));
gpr.BindToRegister(d, false, true);
XOR(32, gpr.R(d), gpr.R(d));
gpr.FlushLockX(ABI_PARAM1, ABI_PARAM2);
gpr.FlushLockX(ABI_PARAM1);
X64Reg cr_val = ABI_PARAM1;
X64Reg tmp = ABI_PARAM2;
// we only need to zero the high bits of EAX once
XOR(32, R(EAX), R(EAX));
for (int i = 0; i < 8; i++)
{
static const u8 m_flagTable[8] = {0x0,0x1,0x8,0x9,0x0,0x1,0x8,0x9};
if (i != 0)
SHL(32, R(EAX), Imm8(4));
SHL(32, gpr.R(d), Imm8(4));
MOV(64, R(cr_val), M(&PowerPC::ppcState.cr_val[i]));
// SO: Bit 61 set.
MOV(64, R(tmp), R(cr_val));
SHR(64, R(tmp), Imm8(61));
AND(32, R(tmp), Imm8(1));
OR(32, R(EAX), R(tmp));
// EQ: Bits 31-0 == 0.
XOR(32, R(tmp), R(tmp));
// EQ: Bits 31-0 == 0; set flag bit 1
TEST(32, R(cr_val), R(cr_val));
SETcc(CC_Z, R(tmp));
SHL(32, R(tmp), Imm8(1));
OR(32, R(EAX), R(tmp));
SETcc(CC_Z, R(EAX));
LEA(32, gpr.RX(d), MComplex(gpr.RX(d), EAX, SCALE_2, 0));
// GT: Value > 0.
// GT: Value > 0; set flag bit 2
TEST(64, R(cr_val), R(cr_val));
SETcc(CC_G, R(tmp));
SHL(32, R(tmp), Imm8(2));
OR(32, R(EAX), R(tmp));
SETcc(CC_G, R(EAX));
LEA(32, gpr.RX(d), MComplex(gpr.RX(d), EAX, SCALE_4, 0));
// LT: Bit 62 set.
MOV(64, R(tmp), R(cr_val));
SHR(64, R(tmp), Imm8(62 - 3));
AND(32, R(tmp), Imm8(0x8));
OR(32, R(EAX), R(tmp));
// SO: Bit 61 set; set flag bit 0
// LT: Bit 62 set; set flag bit 3
SHR(64, R(cr_val), Imm8(61));
MOVZX(32, 8, EAX, MDisp(cr_val, (u32)(u64)m_flagTable));
OR(32, gpr.R(d), R(EAX));
}
MOV(32, gpr.R(d), R(EAX));
gpr.UnlockAll();
gpr.UnlockAllX();
}