llvm dev - Nov 2015 - llvm ir

I want to know if %3 will be used or not in the following code, when I try
to phrase line 36, but I don't how to judge. Anyone knows? Please give me
some help,thanks!

 31 define i32 @main() #0 {
 32   %1 = alloca i32, align 4
 33   %vara = alloca i32, align 4
 34   store i32 0, i32* %1
 35   %2 = load i32* %vara, align 4
 36   %3 = call i32 @func(i32 %2)
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You can get all users of one instruction like this:

*  for(Value::user_iterator i = inst->user_begin(), ie = inst->user_end();
i!=ie; ++i) *
*  {*
*      .....*
*  }*

 To check if one instruction is used or not, just check if the number of
users is zero. Hope this helps,

Xiangyang

2015-11-10 21:56 GMT-05:00 Valiant wang via llvm-dev <
llvm-dev at lists.llvm.org>:
> I want to know if %3 will be used or not in the following code, when I try
> to phrase line 36, but I don't how to judge. Anyone knows? Please give
me
> some help,thanks!
>
>  31 define i32 @main() #0 {
>  32   %1 = alloca i32, align 4
>  33   %vara = alloca i32, align 4
>  34   store i32 0, i32* %1
>  35   %2 = load i32* %vara, align 4
>  36   %3 = call i32 @func(i32 %2)
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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