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

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

Good ) Currently I'm working on multi-byte constraints. Once it would be 
done, hope we can compile avr-libc.

-Stepan.

Borja Ferrer wrote:
> 1) I think this now resolved.
> 2) I will take a look, no idea about it now.
>
>
> 2013/6/27 Stepan Dyatkovskiy <stp...@na... <mailto: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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