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https://github.com/dolphin-emu/dolphin.git
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JIT: implement crset special case
Rebel Strike seems to use this one.
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0ff6ad5734
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@ -133,6 +133,7 @@ public:
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// Clobbers RDX.
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// Clobbers RDX.
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void SetCRFieldBit(int field, int bit, Gen::X64Reg in);
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void SetCRFieldBit(int field, int bit, Gen::X64Reg in);
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void ClearCRFieldBit(int field, int bit);
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void ClearCRFieldBit(int field, int bit);
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void SetCRFieldBit(int field, int bit);
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// Generates a branch that will check if a given bit of a CR register part
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// Generates a branch that will check if a given bit of a CR register part
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// is set or not.
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// is set or not.
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@ -112,6 +112,41 @@ void Jit64::ClearCRFieldBit(int field, int bit)
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// We don't need to set bit 32; the cases where that's needed only come up when setting bits, not clearing.
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// We don't need to set bit 32; the cases where that's needed only come up when setting bits, not clearing.
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}
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}
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void Jit64::SetCRFieldBit(int field, int bit)
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{
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MOV(64, R(RSCRATCH), PPCSTATE(cr_val[field]));
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if (bit != CR_GT_BIT)
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{
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TEST(64, R(RSCRATCH), R(RSCRATCH));
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FixupBranch dont_clear_gt = J_CC(CC_NZ);
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BTS(64, R(RSCRATCH), Imm8(63));
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SetJumpTarget(dont_clear_gt);
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}
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switch (bit)
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{
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case CR_SO_BIT:
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BTS(64, PPCSTATE(cr_val[field]), Imm8(61));
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break;
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case CR_EQ_BIT:
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SHR(64, R(RSCRATCH), Imm8(32));
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SHL(64, R(RSCRATCH), Imm8(32));
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break;
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case CR_GT_BIT:
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BTR(64, PPCSTATE(cr_val[field]), Imm8(63));
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break;
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case CR_LT_BIT:
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BTS(64, PPCSTATE(cr_val[field]), Imm8(62));
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break;
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}
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BTS(64, R(RSCRATCH), Imm8(32));
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MOV(64, PPCSTATE(cr_val[field]), R(RSCRATCH));
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}
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FixupBranch Jit64::JumpIfCRFieldBit(int field, int bit, bool jump_if_set)
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FixupBranch Jit64::JumpIfCRFieldBit(int field, int bit, bool jump_if_set)
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{
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{
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switch (bit)
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switch (bit)
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@ -506,6 +541,13 @@ void Jit64::crXXX(UGeckoInstruction inst)
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return;
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return;
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}
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}
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// Special case: crset
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if (inst.CRBA == inst.CRBB && inst.CRBA == inst.CRBD && inst.SUBOP10 == 289)
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{
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SetCRFieldBit(inst.CRBD >> 2, 3 - (inst.CRBD & 3));
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return;
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}
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// TODO(delroth): Potential optimizations could be applied here. For
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// TODO(delroth): Potential optimizations could be applied here. For
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// instance, if the two CR bits being loaded are the same, two loads are
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// instance, if the two CR bits being loaded are the same, two loads are
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// not required.
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// not required.
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