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Fork of llvm with experimental commits and workarounds for RPCS3
768a368cf7
This is for D60460. computeForAddSub() essentially already supports carries because it has to deal with subtractions. This revision extracts a lower-level computeForAddCarry() function, which allows computing the known bits for add (carry known zero), sub (carry known one) and addcarry (carry unknown). As we don't seem to have any yet, I've added a unit test file for KnownBits and exhaustive tests for the new computeForAddCarry() functionality, as well the existing computeForAddSub() function. Differential Revision: https://reviews.llvm.org/D60522 llvm-svn: 358297 |
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