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[a64] Implement `OPCODE_DID_SATURATE` 

This directly maps to the QC bit in the FPSR. Just have to make sure
that the saturated instruction is the very last instruction(which is
currently the case for stuff like VECTOR_ADD and such).
This commit is contained in:
Wunkolo 2024-05-27 13:29:19 -07:00
parent 818a77356e
commit f830f790d1
1 changed files with 3 additions and 2 deletions
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5
src/xenia/cpu/backend/a64/a64_sequences.cc
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@ -1107,8 +1107,9 @@ EMITTER_ASSOCIATIVE_COMPARE_FLT_XX(UGE, Cond::HS); // setae
struct DID_SATURATE
: Sequence<DID_SATURATE, I<OPCODE_DID_SATURATE, I8Op, V128Op>> {
static void Emit(A64Emitter& e, const EmitArgType& i) {
// TODO(benvanik): implement saturation check (VECTOR_ADD, etc).
e.EOR(i.dest, i.dest, i.dest);
// Bit 27 in the FPSR is the QC bit
e.MRS(X0, SystemReg::FPSR);
e.UBFX(i.dest, W0, 27, 1);
}
};
EMITTER_OPCODE_TABLE(OPCODE_DID_SATURATE, DID_SATURATE);