[LLVMdev] ARM backend problem ?

[Lauro Ramos Venancio]

Hi Mikael,

You are obtaining warning, not an error, right? The most arm cores,
including arm1136, can execute mul with rd = rm. So, you can ignore
this warning.

Lauro

2007/6/12, Peltier, Mikael <m-peltier at ti.com>:
>
>
>
>
> Hello,
>
>
>
> I want to compile a LLVM file into an executable running on ARM platform.
>
> I use LLVM 2.0 with the following command lines:
>
> llvm-as -f –o test.bc test.ll
>
> llc –march=arm –mcpu=arm1136j-s –mattr=+v6 –f –o test.s test.bc
>
> arm-linux-gnu-as –mcpu=arm1136j-s  test.s
>
>
>
> With the last command, I obtain the following error:
>
> rd and rm should be different in mul
>
>
>
> The bad instruction is "mul r3, r3, r2" that follows the syntax "mul rd, rm,
> rs".
>
>
>
> I want to know where is my mistake or if it is a bug in register allocator ?
>
>
>
> Thanks in advance.
>
>
>
> Mikaël.
>
>
>
>
>
>
>
> target datalayout =
> "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64"
>
> @.str1 = internal constant [4 x i8] c"%d\0A\00"
>
>
>
> declare i32 @printf(i8*, ...)
>
>
>
> define i32 @main (){
>
> entry:
>
>   %n = alloca i32
>
>   %f = alloca i32
>
>   %i = alloca i32
>
>   %zero = alloca i32
>
>   %inc = alloca i32
>
>   store i32 5, i32* %n
>
>   store i32 1, i32* %f
>
>   store i32 1, i32* %i
>
>   store i32 0 , i32* %zero
>
>   store i32 1 , i32* %inc
>
>
>
>   %tmp7 = load i32* %n
>
>   %tmp8 = load i32* %zero
>
>   %tmp6 = icmp sgt i32 %tmp7, %tmp8
>
>   br i1 %tmp6, label %then4, label %else12
>
>
>
> then4:
>
>   %tmp14 = load i32* %i
>
>   %tmp16 = load i32* %n
>
>   %tmp18 = load i32* %inc
>
>   %tmp15 = add i32 %tmp16, %tmp18
>
>   %tmp13 = icmp slt i32 %tmp14, %tmp15
>
>   br i1 %tmp13, label %then11, label %else12
>
>
>
> then11:
>
>   %tmp20 = load i32* %f
>
>   %tmp22 = alloca i32
>
>   store i32 1 , i32* %tmp22
>
>   %tmp23 = load i32* %tmp22
>
>   %tmp24 = load i32* %i
>
>   %tmp21 = add i32 %tmp24, %tmp23
>
>   store i32 %tmp21, i32* %i
>
>   %tmp19 = mul i32 %tmp20, %tmp21
>
>   store i32 %tmp19, i32* %f
>
>   br label %then4
>
>
>
> else12:
>
>   %tmp25 = load i32* %f
>
>   %tmp335 = getelementptr [4 x i8]* @.str1, i32 0, i32 0
>
>   %tmp336 = call i32 (i8*, ...)* @printf( i8* %tmp335, i32 %tmp25 )
>
>
>    ret i32 %tmp25
>
> }
>
>
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