ShuriZma
/
dolphin
mirror of https://github.com/dolphin-emu/dolphin.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Jit_Integer: srawix

This commit is contained in:
MerryMage 2018-10-15 21:01:15 +01:00
parent 817fddf734
commit 31bd9b5cd0
1 changed files with 17 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
View File

@ -1865,49 +1865,51 @@ void Jit64::srawix(UGeckoInstruction inst)
if (amount != 0)
{
gpr.Lock(a, s);
gpr.BindToRegister(a, a == s, true);
RCX64Reg Ra = gpr.Bind(a, RCMode::Write);
RCOpArg Rs = gpr.Use(s, RCMode::Read);
RegCache::Realize(Ra, Rs);
if (!js.op->wantsCA)
{
if (a != s)
MOV(32, gpr.R(a), gpr.R(s));
SAR(32, gpr.R(a), Imm8(amount));
MOV(32, Ra, Rs);
SAR(32, Ra, Imm8(amount));
}
else
{
MOV(32, R(RSCRATCH), gpr.R(s));
MOV(32, R(RSCRATCH), Rs);
if (a != s)
MOV(32, gpr.R(a), R(RSCRATCH));
MOV(32, Ra, R(RSCRATCH));
// some optimized common cases that can be done in slightly fewer ops
if (amount == 1)
{
SHR(32, R(RSCRATCH), Imm8(31)); // sign
AND(32, R(RSCRATCH), gpr.R(a)); // (sign && carry)
SAR(32, gpr.R(a), Imm8(1));
AND(32, R(RSCRATCH), Ra); // (sign && carry)
SAR(32, Ra, Imm8(1));
MOV(8, PPCSTATE(xer_ca),
R(RSCRATCH)); // XER.CA = sign && carry, aka (input&0x80000001) == 0x80000001
}
else
{
SAR(32, gpr.R(a), Imm8(amount));
SAR(32, Ra, Imm8(amount));
SHL(32, R(RSCRATCH), Imm8(32 - amount));
TEST(32, R(RSCRATCH), gpr.R(a));
TEST(32, R(RSCRATCH), Ra);
FinalizeCarry(CC_NZ);
}
}
}
else
{
gpr.Lock(a, s);
FinalizeCarry(false);
gpr.BindToRegister(a, a == s, true);
RCX64Reg Ra = gpr.Bind(a, RCMode::Write);
RCOpArg Rs = gpr.Use(s, RCMode::Read);
RegCache::Realize(Ra, Rs);
if (a != s)
MOV(32, gpr.R(a), gpr.R(s));
MOV(32, Ra, Rs);
}
if (inst.Rc)
ComputeRC(gpr.R(a));
gpr.UnlockAll();
ComputeRC(a);
}
// count leading zeroes