[LLVMdev] ARM backend problem ?

[Peltier, Mikael]

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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