[LLVMdev] Question about porting LLVM - a single instruction op mnemonic with multiple operand forms

[Villmow, Micah]

The backend is for AMDIL
I have a simple pattern that loads all immediate values to registers first and that way no instruction patterns need duplicate forms for both registers and immediates.

Micah

From: Lu Mitnick [mailto:king19880326 at gmail.com]
Sent: Tuesday, January 18, 2011 11:48 AM
To: Villmow, Micah
Cc: llvmdev at cs.uiuc.edu
Subject: Re: [LLVMdev] Question about porting LLVM - a single instruction op mnemonic with multiple operand forms

Hello Villmow,

Is it your backend EFI Byte Code Virtual Machine?? Would you mind to give me an example about what pseudo instruction you add??

thanks a lot

yi-hong

2011/1/19 Villmow, Micah <Micah.Villmow at amd.com<mailto:Micah.Villmow at amd.com>>
I have this same problem in our backend. I solve it by adding a pseudo instruction at instruction selection that transforms @R1 into R1, so only a single pattern is required. I then can propogate the pseudo instruction after instruction selection.

Micah

From: llvmdev-bounces at cs.uiuc.edu<mailto:llvmdev-bounces at cs.uiuc.edu> [mailto:llvmdev-bounces at cs.uiuc.edu<mailto:llvmdev-bounces at cs.uiuc.edu>] On Behalf Of Lu Mitnick
Sent: Tuesday, January 18, 2011 10:29 AM
To: llvmdev at cs.uiuc.edu<mailto:llvmdev at cs.uiuc.edu>
Subject: [LLVMdev] Question about porting LLVM - a single instruction op mnemonic with multiple operand forms

Hello all,

I am at the adding Instruction Set stage of adding new target support into LLVM. There is a single instruction op mnemonic with multiple operand forms. For example: Add R1, R2 & Add @R1, R2. I found that there is similar case in x86 instruction set, such like ADD reg, reg & ADD mem, reg. However, the solution of x86 is adding suffix of instruction and translating instruction op mnemonic into ADDrr & ADDmr. I don't want to translate single instruction op mnemonic with different operand forms into multiple op mnemonics. I am wondering to know whether is another solution of this problem or not?? Which target should I look for it??

thanks a lot

yi-hong

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