[llvm-dev] distinguish program and temporary variables
mats petersson via llvm-dev
llvm-dev at lists.llvm.org
Mon Feb 8 09:36:24 PST 2016
That REALLY sounds like something that should be done at an earlier stage
in the compilation - at LLVM level, you can't really know whether something
was produced by the compiler itself, or as a consequence of something in
the source code.
Unless there is some very specific pattern to those varibles (e.g. "they
are always called XYZ_abc_kerflunk_billy_bob_*" - it is unlikely that the
compiler will call a generated variable that).
On 8 February 2016 at 17:17, Mohammad Norouzi via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> I'm writing a pass that eliminates some variables. To show the effect of
> the pass i need to show that I deleted the variables that originally appear
> in the user code, not temporary variables added by llvm.
> On Mon, Feb 8, 2016 at 5:59 PM, Mehdi Amini <mehdi.amini at apple.com> wrote:
>> > On Feb 8, 2016, at 6:39 AM, Mohammad Norouzi via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>> > Hi,
>> > I need to check if a variable belongs to the program originally.
>> Consider the following code line:
>> > y = x + 4
>> > and its corresponding llvm ir (roughly):
>> > %16 = load i32 %x
>> > %add = add i32 %16, i32 4
>> > store i32 %add, %y
>> > I need to distinguish between %16, %add and %x, %y.
>> This look like it will quickly degrades with optimization to a point
>> where it won't be meaningful.
>> Why are you needing this? What are you trying to accomplish?
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