[LLVMdev] Temporary register subscript

[Eli Friedman]

On Sun, Aug 7, 2011 at 9:01 PM, Jun Mendoza <junmendoza78 at gmail.com> wrote:
> Hi Folks,
> I noticed that recently in the online code gen demo that generating the
> unique temporaries have been modified.
> I don't believe i changed any options. (C++, demangle names, no
> optimization)
>
> Where:
> if(x >= y){
> }
>
> Previously Compiles to:
> %0 = load i32* %x, align 4
> %1 = load i32* %y, align 4
> %2 = icmp sge i32 %0, %1
> br i1 %2, label %bb, label %bb1
> bb:
> ; true goes here
>
> Currently Compiles to:
>
> %tmp = load i32* %x
> %tmp1 = load i32* %y
> %cmp = icmp sge i32 %tmp, %tmp1
> br i1 %cmp, label %if.then, label %if.end
>
> if.then:
> ; true goes here
>
> If this is the case then is there a mailing list or Status update page that
> reflects this behavior?
>
> My question may seem trivial however, im still in llvm exploration mode :)
>
> Im working on a compiler that generates LLVM IR and for the moment i dont
> use the code gen API. I rely on the Assembly manual and demo for reference
> (Although at some point i will need to use the API in order to take full
> advantage).

Yes, we recently replaced the compiler on the demo page.  Both syntax
forms have the same meaning; changing the name of anything that is not
a global does not affect code generation.  Giving the values names
tends to be a bit more convenient for compiler developers to read.
Most values are named in builds with asserts enabled, but are not
named in builds without assertions for performance reasons.  I guess
the build the demo page is using is a build with assertions enabled at
the moment.

-Eli