[LLVMdev] IR in SSA form?

[Reid Kleckner]

There are no phi functions because the program (for me with clang) is
optimized to:

define i32 @main(i32 %argc, i8** nocapture %argv) nounwind readnone {
  ret i32 1
}

Basically, the loop is unrolled, the array is unpacked into scalars,
and things are DCE/folded away.

Reid

On Tue, Mar 29, 2011 at 1:26 PM, George Baah <georgebaah at gmail.com> wrote:
> Hi All,
>   When I run the following command
> llvm-gcc -03 -emit-llvm test.cpp -c -o test.bc or llvm-gcc -emit-llvm
> test.cpp -c -o test.bc
> on the program test.cpp, the IR representation is not in SSA form.
> I do not see any phi functions.
> program: test.cpp
> int main(int argc, char **argv)
> {
>   int a[2],i,j;
>   for(i=0;i<2;i++)
>   {
>     a[i] = i;
>   }
>   return a[1];
> }
> Any clarifications will be greatly appreciated. Thanks.
> George
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