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

[Stepan D. <stp...@na...>]

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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