Update GetRangeFromAssertions to handle constants that FitsIn<int32_t> - #128935
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Update GetRangeFromAssertions to handle constants that FitsIn<int32_t>#128935tannergooding wants to merge 1 commit into
tannergooding wants to merge 1 commit into
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch |
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Pull request overview
This PR updates the JIT’s “range-from-assertions” helper to accept an explicit var_types and to better cope with VN constants that aren’t strictly TYP_INT (notably including integral constants whose value fits in int32_t). The change primarily affects how Assertion Prop queries and consumes inferred ranges.
Changes:
- Extend
RangeCheck::GetRangeFromAssertions/ worker to take an explicitvar_types typeand thread it through recursive calls. - Adjust
GetRangeFromAssertionsWorkerto treat any VN constant specially (return a constant range if it can be represented as anint, otherwise return unknown). - Update Assertion Prop call sites to pass the relevant tree type and to tolerate non-constant ranges (instead of asserting constant-range unconditionally).
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| src/coreclr/jit/rangecheck.h | Updates the GetRangeFromAssertions* signatures to include an explicit var_types type. |
| src/coreclr/jit/rangecheck.cpp | Implements the new signature, updates recursion call sites, and revises constant/type handling in the worker. |
| src/coreclr/jit/assertionprop.cpp | Updates callers to pass types and makes range consumers resilient to non-constant results. |
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| GenTreeBoundsChk* arrBndsChk = tree->AsBoundsChk(); | ||
| GenTree* arrBndsChkIdx = arrBndsChk->GetIndex(); | ||
| GenTree* arrBndsChkLen = arrBndsChk->GetArrayLength(); | ||
| ValueNum vnCurIdx = vnStore->VNConservativeNormalValue(arrBndsChk->GetIndex()->gtVNPair); | ||
| ValueNum vnCurLen = vnStore->VNConservativeNormalValue(arrBndsChk->GetArrayLength()->gtVNPair); |
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The difference between partial and full is around -400k bytes of codegen for a few dozen extra loc, better to just take the full thing |
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