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Commits on May 12, 2017

• [APInt] Add a utility method to change the bit width and storage size of an APInt.

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Commits on May 11, 2017

• [APInt] Remove an APInt copy from the return of APInt::multiplicativeInverse.

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• [APInt] Fix typo in comment. NFC

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• [APInt] Remove an unneeded extra temporary APInt from toString.

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• [APInt] Use negate() instead of copying an APInt to negate it and then writing back over the original value.

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• [SCEV] Reduce possible APInt allocations a bit.

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• [SCEV] Remove unneeded 'using namespace APIntOps'.

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Commits on May 10, 2017

• [ConstantRange] Fix the early out in ConstantRange::multiply for positive numbers to really do what the comment says

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• [APInt] Add negate helper method to implement twos complement. Use it to shorten code.

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• [APInt] Make toString use udivrem instead of calling the divide helper method directly. Do a better job of reusing allocations while looping. NFCI

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• [APInt] Use uint32_t instead of unsigned for the storage type throughout the divide code. Use Lo_32/Hi_32/Make_64 helpers instead of casts and shifts. NFCI

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• [APInt] Use getRawData to slightly simplify some code.

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• [APInt] Remove check for single word since single word was handled earlier in the function. NFC

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• [ConstantRange] Add test case showing a case where we pick too large of a range for multiply after r271020.

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• [APInt] Fix indentation of tcDivide. Combine variable declaration and initialization.

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• [APInt] Use getNumWords function in udiv/urem/udivrem instead of reimplementinging it.

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Commits on May 9, 2017

• [APInt] Remove return value from tcFullMultiply.

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• [X86] Add more patterns for BZHI isel

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• [ConstantRange] Rewrite shl to avoid repeated calls to getUnsignedMax and avoid creating the min APInt until we're sure we need it. Use inplace shift operations.

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• [ConstantRange] Combine the two adds max+1 in lshr into a single addition.

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• [ConstantRange] Use APInt::isNullValue in place of comparing with 0. The compiler should be able to generate slightly better code for the former. NFC

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Commits on May 8, 2017

• [APInt] Use default constructor instead of explicitly creating a 1-bit APInt in udiv and urem. NFC

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• [APInt] Remove 'else' after 'return' in udiv and urem. NFC

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• [ARM] Use a Changed flag to avoid making a pass's return value dependent on a compare with a Statistic object.

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• [SCEV] Make setRange take ConstantRange by value instead of rvalue reference so we don't force anything on the caller.

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• [SCEV] Don't use std::move on both inputs to APInt::operator+ or operator-. It might be confusing to the reader. NFC

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• [ValueTracking] Use KnownOnes to provide a better bound on known zeros for ctlz/cttz intrinics

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• [ValueTracking] Introduce a version of computeKnownBits that returns a KnownBits struct. Begin using it to replace internal usages of ComputeSignBit

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• [APInt] Modify tcMultiplyPart's overflow detection to not depend on 'i' from the earlier loop. NFC

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• [APInt] Use std::min instead of writing the same thing with the ternary operator. NFC

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• [APInt] Remove 'else' after 'return' in tcMultiply methods. NFC

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• [SCEV] Use APInt::operator*=(uint64_t) to avoid a temporary APInt for a constant.

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• [APInt] Take advantage of new operator*=(uint64_t) to remove a temporary APInt.

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• [APInt] Add support for multiplying by a uint64_t.

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• [SCEV] Have getRangeForAffineARHelper take StartRange by const reference to avoid a copy in many of the cases.

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