[all-commits] [llvm/llvm-project] 4e44c2: [ValueTracking][InstCombine] restrict FP min/max m...
Sanjay Patel via All-commits
all-commits at lists.llvm.org
Thu Aug 25 13:52:57 PDT 2022
Branch: refs/heads/main
Home: https://github.com/llvm/llvm-project
Commit: 4e44c22c97be99f7c3864fb9fc68b3295835d837
https://github.com/llvm/llvm-project/commit/4e44c22c97be99f7c3864fb9fc68b3295835d837
Author: Sanjay Patel <spatel at rotateright.com>
Date: 2022-08-25 (Thu, 25 Aug 2022)
Changed paths:
M llvm/lib/Analysis/ValueTracking.cpp
M llvm/test/Transforms/InstCombine/minmax-fp.ll
M llvm/unittests/Analysis/ValueTrackingTest.cpp
Log Message:
-----------
[ValueTracking][InstCombine] restrict FP min/max matching to avoid miscompile
This is a long-standing FIXME with a non-FMF test that exposes
the bug as shown in issue #57357.
It's possible that there's still a way to miscompile by
mis-identifying/mis-folding FP min/max patterns, but
this patch only exposes a couple of seemingly minor
regressions while preventing the broken transform.
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