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

JIT: implement crset special case 

Rebel Strike seems to use this one.
This commit is contained in:
Fiora 2015-01-02 13:38:24 -08:00
parent 0ff6ad5734
commit 6dc7cf29f3
2 changed files with 43 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Source/Core/Core/PowerPC/Jit64/Jit.h
View File

@ -133,6 +133,7 @@ public:
// Clobbers RDX.
void SetCRFieldBit(int field, int bit, Gen::X64Reg in);
void ClearCRFieldBit(int field, int bit);
void SetCRFieldBit(int field, int bit);
// Generates a branch that will check if a given bit of a CR register part
// is set or not.

42
Source/Core/Core/PowerPC/Jit64/Jit_SystemRegisters.cpp
View File

@ -112,6 +112,41 @@ void Jit64::ClearCRFieldBit(int field, int bit)
// We don't need to set bit 32; the cases where that's needed only come up when setting bits, not clearing.
}
void Jit64::SetCRFieldBit(int field, int bit)
{
MOV(64, R(RSCRATCH), PPCSTATE(cr_val[field]));
if (bit != CR_GT_BIT)
{
TEST(64, R(RSCRATCH), R(RSCRATCH));
FixupBranch dont_clear_gt = J_CC(CC_NZ);
BTS(64, R(RSCRATCH), Imm8(63));
SetJumpTarget(dont_clear_gt);
}
switch (bit)
{
case CR_SO_BIT:
BTS(64, PPCSTATE(cr_val[field]), Imm8(61));
break;
case CR_EQ_BIT:
SHR(64, R(RSCRATCH), Imm8(32));
SHL(64, R(RSCRATCH), Imm8(32));
break;
case CR_GT_BIT:
BTR(64, PPCSTATE(cr_val[field]), Imm8(63));
break;
case CR_LT_BIT:
BTS(64, PPCSTATE(cr_val[field]), Imm8(62));
break;
}
BTS(64, R(RSCRATCH), Imm8(32));
MOV(64, PPCSTATE(cr_val[field]), R(RSCRATCH));
}
FixupBranch Jit64::JumpIfCRFieldBit(int field, int bit, bool jump_if_set)
{
switch (bit)
@ -506,6 +541,13 @@ void Jit64::crXXX(UGeckoInstruction inst)
return;
}
// Special case: crset
if (inst.CRBA == inst.CRBB && inst.CRBA == inst.CRBD && inst.SUBOP10 == 289)
{
SetCRFieldBit(inst.CRBD >> 2, 3 - (inst.CRBD & 3));
return;
}
// TODO(delroth): Potential optimizations could be applied here. For
// instance, if the two CR bits being loaded are the same, two loads are
// not required.