[llvm-mca][FeatureRequest] In timeline graph, note source of delay for each instruction

[ibogosavljevic]

Currently, the timeline graph looks like this:

Timeline view:
                    012345
Index     0123456789

[0,0]     DeeER.    .    .   vmulps   %xmm0, %xmm1, %xmm2
[0,1]     D==eeeER  .    .   vhaddps  %xmm2, %xmm2, %xmm3
[0,2]     .D====eeeER    .   vhaddps  %xmm3, %xmm3, %xmm4
[1,0]     .DeeE-----R    .   vmulps   %xmm0, %xmm1, %xmm2
[1,1]     . D=eeeE---R   .   vhaddps  %xmm2, %xmm2, %xmm3
[1,2]     . D====eeeER   .   vhaddps  %xmm3, %xmm3, %xmm4
[2,0]     .  DeeE-----R  .   vmulps   %xmm0, %xmm1, %xmm2
[2,1]     .  D====eeeER  .   vhaddps  %xmm2, %xmm2, %xmm3
[2,2]     .   D======eeeER   vhaddps  %xmm3, %xmm3, %xmm4

The value = means an instruction is dispatched but it cannot execute. There are two reasons why an instruction cannot execute:

• It is waiting for data from some previous instruction (dependency)
• It is waiting for available HW resource (resource pressure)

Instead of using = for both reasons, consider using one character (e.g. =) for dependency stall, and another character (e.g. _) for resource pressure stall.

[llvmbot]

@llvm/issue-subscribers-tools-llvm-mca

Author: Ivica Bogosavljevic (ibogosavljevic)

Currently, the timeline graph looks like this:

Timeline view:
                    012345
Index     0123456789

[0,0]     DeeER.    .    .   vmulps   %xmm0, %xmm1, %xmm2
[0,1]     D==eeeER  .    .   vhaddps  %xmm2, %xmm2, %xmm3
[0,2]     .D====eeeER    .   vhaddps  %xmm3, %xmm3, %xmm4
[1,0]     .DeeE-----R    .   vmulps   %xmm0, %xmm1, %xmm2
[1,1]     . D=eeeE---R   .   vhaddps  %xmm2, %xmm2, %xmm3
[1,2]     . D====eeeER   .   vhaddps  %xmm3, %xmm3, %xmm4
[2,0]     .  DeeE-----R  .   vmulps   %xmm0, %xmm1, %xmm2
[2,1]     .  D====eeeER  .   vhaddps  %xmm2, %xmm2, %xmm3
[2,2]     .   D======eeeER   vhaddps  %xmm3, %xmm3, %xmm4

The value = means an instruction is dispatched but it cannot execute. There are two reasons why an instruction cannot execute:

• It is waiting for data from some previous instruction (dependency)
• It is waiting for available HW resource (resource pressure)

Instead of using = for both reasons, consider using one character (e.g. =) for dependency stall, and another character (e.g. _) for resource pressure stall.

[llvmbot]

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.

[llvmbot]

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

Author: Ivica Bogosavljevic (ibogosavljevic)

Currently, the timeline graph looks like this:

Timeline view:
                    012345
Index     0123456789

[0,0]     DeeER.    .    .   vmulps   %xmm0, %xmm1, %xmm2
[0,1]     D==eeeER  .    .   vhaddps  %xmm2, %xmm2, %xmm3
[0,2]     .D====eeeER    .   vhaddps  %xmm3, %xmm3, %xmm4
[1,0]     .DeeE-----R    .   vmulps   %xmm0, %xmm1, %xmm2
[1,1]     . D=eeeE---R   .   vhaddps  %xmm2, %xmm2, %xmm3
[1,2]     . D====eeeER   .   vhaddps  %xmm3, %xmm3, %xmm4
[2,0]     .  DeeE-----R  .   vmulps   %xmm0, %xmm1, %xmm2
[2,1]     .  D====eeeER  .   vhaddps  %xmm2, %xmm2, %xmm3
[2,2]     .   D======eeeER   vhaddps  %xmm3, %xmm3, %xmm4

The value = means an instruction is dispatched but it cannot execute. There are two reasons why an instruction cannot execute:

• It is waiting for data from some previous instruction (dependency)
• It is waiting for available HW resource (resource pressure)

Instead of using = for both reasons, consider using one character (e.g. =) for dependency stall, and another character (e.g. _) for resource pressure stall.

[Aditi-Ch06]

i am currently working on this issue

[mshockwave]

Since you're going to work on the symbology, could you also add a simple legend of these symbols right before or after the timeline view if it doesn't take too much space?

[amansharma612]

@Aditi-Ch06 are you still working on this issue?

[Aditi-Ch06]

@Aditi-Ch06 are you still working on this issue?

ya, i am, since i am a beginner to this kind of project, it takes time for me to understand the code n stuff

[sommersun]

@Aditi-Ch06 hi, are you still working on this issue?

[Aditi-Ch06]

@Aditi-Ch06 hi, are you still working on this issue?

no