Prioritize setTgtPref for the op1 use#128333
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Pull request overview
This PR adjusts CoreCLR JIT LSRA target-preference handling, aiming to make the first preferred operand dominate register selection and changing xarch select handling.
Changes:
- Reorders
setTgtPrefcalls inBuildDef. - Removes xarch
BuildSelectsuppression that previously ignored the false operand as a target preference.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
src/coreclr/jit/lsraxarch.cpp |
Updates xarch select target-preference behavior. |
src/coreclr/jit/lsrabuild.cpp |
Changes target-preference application order during def construction. |
tannergooding
changed the title
This was referenced May 18, 2026
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| @@ -967,13 +967,6 @@ int LinearScan::BuildSelect(GenTreeOp* select) | |||
| srcCount++; | |||
| @@ -967,13 +967,6 @@ int LinearScan::BuildSelect(GenTreeOp* select) | |||
| srcCount++; | |||
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Checking TP/CQ for a case that BuildSelect indicates produces much better codegen.