[LLVMdev] making emitInlineAsm protected

reed kotler rkotler at mips.com
Wed Jan 29 16:14:44 PST 2014

On 01/29/2014 10:01 AM, Eric Christopher wrote:
> On Wed, Jan 29, 2014 at 9:54 AM, Reed Kotler <rkotler at mips.com> wrote:
>> On 01/28/2014 06:29 PM, Eric Christopher wrote:
>>> Uhhhh...
>>> -eric
>>> On Tue, Jan 28, 2014 at 4:56 PM, reed kotler <rkotler at mips.com> wrote:
>>>> I would like to make the following member of AsmPrinter be protected
>>>> void EmitInlineAsm(StringRef Str, const MDNode *LocMDNode = 0,
>>>>                          InlineAsm::AsmDialect AsmDialect =
>>>>                              InlineAsm::AD_ATT) const;
>>>> I have some stubs that I want to emit in MipsAsmParser .
>>>> Are there any objections to doing this?
>>>> Reed
>>>> _______________________________________________
>>>> LLVM Developers mailing list
>>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>> Stubs to emit in MipsAsmPrinter
>> I think you were one of the people that was against me emitting the inline
>> asm earlier as part of the IR.
>> Well, now I am starting to move that to the back end of code generation due
>> to other issues that were not apparent when I first implemented this mips16
>> hard float.
>> Also, it was agreed at that time that it would be better if possible to do
>> things this way.
> Why not just note that you need to emit the functions as you output
> and then emit them during MC?
> -eric
Let me go back one step...

You are saying that instead of using EmitRawText, that I try and do this 
with the higher level AsmPrinter methods.

//Here is a little snipped that does not even include instructions:

OutStreamer.EmitRawText("\t.section\t.mips16.call.fp"+Twine(Symbol)+",\"ax\", at progbits");
     OutStreamer.EmitRawText(".align 2");
     OutStreamer.EmitRawText("\t.ent\t__call_stub_fp_" + Twine(Symbol));
     OutStreamer.EmitRawText("\t.type\t__call_stub_fp_" + Twine(Symbol) 
+ ", @function");
     OutStreamer.EmitRawText("\t__call_stub_fp_" + Twine(Symbol) + ":");
     OutStreamer.EmitRawText("\t.size  __call_stub_fp_" + Twine(Symbol) +
                             ", .-__call_stub_fp_" + Twine(Symbol));
     OutStreamer.EmitRawText("\t.end  __call_stub_fp_" + Twine(Symbol));

(I have other code that generates the exact instructions).

Here is the code it wants to generate:

     .globl    __floatdidf
     # Stub function to call double __floatdidf ()
     .section    .mips16.call.fp.__floatdidf,"ax", at progbits
     .align    2
     .set    nomips16
     .set    nomicromips
     .ent    __call_stub_fp___floatdidf
     .type    __call_stub_fp___floatdidf, @function
     move    $18,$31
     jal    __floatdidf
     mfc1    $2,$f0
     mfc1    $3,$f1
     jr    $18
     .size    __call_stub_fp___floatdidf, .-__call_stub_fp___floatdidf
     .end    __call_stub_fp___floatdidf
     .globl    __mips16_muldf3
     .globl    __mips16_truncdfsf2

This requires a lot of pseudo ops.

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