Re: [avr-llvm-devel] One more difference in clang

[Borja F. <bor...@gm...>]

1) I think this now resolved.
2) I will take a look, no idea about it now.


2013/6/27 Stepan Dyatkovskiy <stp...@na...>

> BTW, for X86 target and memory constraint I got the same as for ARM:
>
> call void asm "instr $0", "=*m,~{dirflag},~{fpsr},~{**flags}"(i32* @a)
> #1, !srcloc !0
>
> It just uses 'm' instead of 'Q'. Note it also contains '*' before 'm'.
>
> -Stepan.
>
>
> Stepan Dyatkovskiy wrote:
>
>> Agh!! MY grammar: Subject: One more differencE in clang. Would you fix
>> it in your reply please.
>> Thanks.
>> -Stepan.
>>
>> Stepan Dyatkovskiy wrote:
>>
>>> Hi guys.
>>>
>>> Today I went through whole AVR-Libc Inline Assembler Cookbook chapter.
>>> I have checked all examples with two commands:
>>> 1. clang -S -o - -emit-llvm example.c
>>> 2. avr-clang -S -o - -emit-llvm example.c
>>>
>>> I've found two difference:
>>>
>>> 1. As I mentioned before difference for memory constraint.
>>> For string "asm("instr %0": "=Q"(a):)"
>>>
>>> clang emits:
>>> %0 = call i32 asm "instr $0", "=Q,~{dirflag},~{fpsr},~{**flags}"()
>>>
>>> arm-linux-gnueabi emits:
>>> call void asm "instr $0", "=*Q"(i32* @a) #1, !srcloc !0
>>>
>>> avr-clang:
>>> %0 = call i16 asm "instr $0", "=Q"()
>>>
>>> I'll try to use current syntax here. Though ARM syntax is working well
>>> now, but I din't find explanation of =*Q sequence yet.
>>>
>>> 2. asm names.
>>>
>>> // example.c:
>>> extern long Calc(void) asm ("CALCULATE");
>>> void f() { Calc(); }
>>>
>>> clang emits:
>>> %call = call i64 @CALCULATE()
>>> ...
>>> declare i64 @CALCULATE()
>>>
>>> avr-clang emits:
>>> %call = call i32 @"\01CALCULATE"()
>>> ...
>>> declare i32 @"\01CALCULATE"()
>>>
>>> Does somebody know what \01 is used for here?
>>>
>>> -Stepan
>>>
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>>
>