Hi!

This issue may be a good introductory issue for people new to working on LLVM. If you would like to work on this issue, your first steps are:

1. Check that no other contributor has already been assigned to this issue. If you believe that no one is actually working on it despite an assignment, ping the person. After one week without a response, the assignee may be changed.
2. In the comments of this issue, request for it to be assigned to you, or just create a pull request after following the steps below. Mention this issue in the description of the pull request.
3. Fix the issue locally.
4. Run the test suite locally. Remember that the subdirectories under test/ create fine-grained testing targets, so you can e.g. use make check-clang-ast to only run Clang's AST tests.
5. Create a Git commit.
6. Run git clang-format HEAD~1 to format your changes.
7. Open a pull request to the upstream repository on GitHub. Detailed instructions can be found in GitHub's documentation. Mention this issue in the description of the pull request.

If you have any further questions about this issue, don't hesitate to ask via a comment in the thread below.

@llvm/issue-subscribers-good-first-issue

Author: Matt Arsenault (arsenm)

define float @<!-- -->src(float %x, i1 %bool) {
  %select = select i1 %bool, float 1.000000e+00, float %x
  %frexp = tail call { float, i32 } @<!-- -->llvm.frexp.f32.i32(float %select)
  %frexp.0 = extractvalue { float, i32 } %frexp, 0
  ret float %frexp.0
}

define float @<!-- -->tgt(float %x, i1 %bool) {
  %frexp = tail call { float, i32 } @<!-- -->llvm.frexp.f32.i32(float %x)
  %frexp.0 = extractvalue { float, i32 } %frexp, 0
  %select = select i1 %bool, float 5.000000e-01, float %frexp.0
  ret float %select
}

Hello,
Can this issue be assigned to me, I want to work on this?
Thanks

@isakhilesh are you still working on this?

@isakhilesh are you still working on this?

Hey, yes I am working on the issue.

Hi @isakhilesh, are you still working on this? What progress have you made?

As @isakhilesh doesn't seem to be working on the issue anymore, can I be assigned the issue instead?

Hey this looks intriguing! Unless someone is still working on it could it be assigned to me?

So just to be clear, we aim to implement 3 things:

• Replace the frexp with select between frexps
• Compute frexp of constants at compile time
• Check that extractvalue instr are used only once

and concerned source files are InstCombineSelect.cpp and InstCombineMulDivRem.cpp
Have I misinterpreted anything?

Hi is anyone working on this? I'd like to if not

So just to be clear, we aim to implement 3 things:

• Replace the frexp with select between frexps

There is only a single frexp in the source and result, but logically yes. This shouldn't be done if one of the frexps doesn't fold away

and concerned source files are InstCombineSelect.cpp and InstCombineMulDivRem.cpp

Yes

Hi is anyone working on this? I'd like to if not

Yes I am.