That code ends up in src/arch/arm/isa/insts/mult.isa which ultimately calls
buildMultInst() and that function emits two versions of Mul one that sets the
condition codes and one that does not. The prior has Cc appended to the name.
Ali
On Jun 24, 2013, at 4:13 PM, Jianghao <guojh...@gmail.com> wrote:
> 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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