Ian Lance Taylor - Re: Extracting destination register from an instruction (original) (raw)

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• From: Ian Lance Taylor
• To: "Balaji V. Iyer"
• Cc: gcc at gcc dot gnu dot org
• Date: 16 Nov 2005 07:01:37 -0800
• Subject: Re: Extracting destination register from an instruction
• References: <57491.24.163.112.200.1132119165.squirrel@webmail.ncsu.edu>

"Balaji V. Iyer" bviyer@ncsu.edu writes:

I have  a question about finding register names from the instruction.

I am porting GCC for a propriatery architecture and the thing is that, I want to group instructions whose destination registers are between 0-15 into one cluster and 16-31 in another. Firstly, I was under the impression that the only way I can do this is in the machine_dependent reorganization phase? Is there another way to do this?

Yes, in general you can only do VLIW instruction grouping in the machine dependent reorganization phase, or in TARGET_ASM_FUNCTION_PROLOGUE just before the final pass.

Also, how can I extract destination register information from the instruction?

One way is to call note_stores and look for registers being changed.

Ian

• References:
  • Extracting destination register from an instruction
    * From: Balaji V. Iyer