Valeriy Savchenko 75a354ba55
[InstCombine] Use ComputeNumSignBits in isKnownExactCastIntToFP (#190235)
For signed int-to-FP casts, ComputeNumSignBits can prove exactness where
computeKnownBits cannot -- e.g. through ashr(shl x, a), b where sign propagation is
tracked precisely but individual known bits are all unknown.
2026-04-02 21:04:29 +01:00
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