I have a questions about ARM ISA implementation.
From the document, instruction "format" is basically a Python function
to generate up to four pieces of C++ code.
If it's nested format structure like following code, which one will be
used, DataOp, ArmMultAndMultAcc or both for the multiply instruction?
decode COND_CODE {
0xF: ArmUnconditional::armUnconditional();
default: decode ENCODING {
format DataOp {
0x0: decode SEVEN_AND_FOUR {
1: decode MISC_OPCODE {
0x9: decode PREPOST {
0: ArmMultAndMultAcc::armMultAndMultAcc();
1: ArmSyncMem::armSyncMem();
}
0xb, 0xd, 0xf: AddrMode3::addrMode3();
}
When I take a look of ArmMultAndMultAcc format code, there are return
statements like following
"return new MulCc(machInst, rd, rm, rn);"
What's the meaning of this? I even cannot grep any definition of MulCc
in src directory.
Thanks
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