[llvm-dev] (no subject)

[SHALINI JAIN via llvm-dev]

Hi,

I want to profile each loop in order to collect execution time. Currently I
inserted following timer instructions into LLVM IR Version3.4 and
successfully got the results.

before loop:
In C:
         int t1=clock();

Equilavent IR:
  %t1 = alloca i32, align 4
  %t2 = alloca i32, align 4
  %1 = call i64 @clock() #3
  %2 = trunc i64 %1 to i32
  store i32 %2, i32* %t1, align 4

After loop:
In C:
         int t2=clock();
         printf("%f\n",((float)t2-t1)/CLOCKS_PER_SEC);

Equivalent IR:
%3 = call i64 @clock() #3
  %4 = trunc i64 %3 to i32
  store i32 %4, i32* %t2, align 4
  %5 = load i32* %t2, align 4
  %6 = sitofp i32 %5 to float
  %7 = load i32* %t1, align 4
  %8 = sitofp i32 %7 to float
  %9 = fsub float %6, %8
  %10 = fdiv float %9, 1.000000e+06
  %11 = fpext float %10 to double
  %12 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([4 x i8]*
@.str, i32 0, i32 0), double %11)


I want to do the same in LLVM4.0. I tried inserted these got error.

-- 
Regards
Shalini
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