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Commits on Apr 4, 2017

• [InstCombine] Add test cases for various add/subtracts of constants(scalar, splat, and vector) with phis and selects. Improvements coming in a future commit.

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• [InstCombine] Turn subtract of vectors of i1 into xor like we do for scalar i1. Matches what we already do for add.

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• [InstCombine] Support folding and/or/xor with a constant vector RHS into selects and phis

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• [InstCombine] Add test cases for missing combines of phis with and/or/xor with constant argument. NFC

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• [InstCombine] Add more test cases for missing combines of selects with and/or/xor with constant argument. NFC

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• [InstCombine] Use setAllBits in place of getAllOnesValue since we know the bitwidths are the same. NFCI

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Commits on Apr 3, 2017

• [InstCombine] Remove canonicalization for (X & C1) | C2 --> (X | C2) & (C1|C2) when C1 & C2 have common bits.

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• [DAGCombine][InstCombine] Fix inverted if condition in equivalent comments in DAGCombine and InstCombine. NFC

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• [InstCombine] Add test cases showing how we fail to fold vector constants into selects the way we do with scalars.

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• Revert r299337 "[InstCombine] Remove redundant combine from visitAnd"

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• [APInt] Move isMask and isShiftedMask out of APIntOps and into the APInt class. Implement them without memory allocation for multiword

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• [InstCombine] Make foldOpWithConstantIntoOperand take a BinaryOperator instead of a generic Instruction.

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• [InstCombine] Remove a And transform that should be handled by SimplifyDemandedInstructionBits. NFCI

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Commits on Apr 2, 2017

• [APInt] Make use of whichWord and maskBit to simplify some code. NFC

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• [APInt] Add a public typedef for the internal type of APInt use it instead of integerPart. Make APINT_BITS_PER_WORD and APINT_WORD_SIZE public.

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• [InstCombine] Make InstCombiner::OptAndOp take a BinaryOperator instead of an Instruction.

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• [InstCombine] Remove redundant combine from visitAnd

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• [X86] Use tcAdd/tcSubtract to implement the slow case of operator+=/operator-=.

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• [APInt] Combine declaration and initialization. NFC

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• [APInt] Simplify some code by using operator+=(uint64_t) instead of doing a more complex assignment into a temporary APInt just to use the APInt operator+=.

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• [APInt] Fix typo in comment. NFC

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Commits on Apr 1, 2017

• [APInt] Use conditional operator to simplify some code. NFC

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• [APInt] Implement flipAllBitsSlowCase with tcComplement. NFCI

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• [APInt] Fix indentation. NFC

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• [APInt] Implement AndAssignSlowCase using tcAnd. Do the same for Or and Xor. NFCI

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• [APInt] Allow GreatestCommonDivisor to take rvalue inputs efficiently. Use moves instead of copies in the loop.

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• [APInt] Implement operator! using operator==(uint64_t). NFCI

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• [APInt] Remove the mul/urem/srem/udiv/sdiv functions from the APIntOps namespace. Replace the few usages with calls to the class methods. NFC

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• [DAGCombiner] Fix fold (or (shuf A, V_0, MA), (shuf B, V_0, MB)) -> (shuf A, B, Mask) to explicitly ensure that only one of the inputs of each shuffle is a zero vector.

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Commits on Mar 31, 2017

• [APInt] Fix bugs in isShiftedMask to match behavior of the similar function in MathExtras.h

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• [InstCombine] When adding an Instruction and its Users to the worklist at the same time, make sure we put the Users in first. Then put in the instruction.

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• [InstCombine] Add test case demonstrating missed opportunities for removing add/sub when the LSBs of one input are known to be 0 and MSBs of the output aren't consumed.

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• [APInt] Remove shift functions from APIntOps namespace. Replace the few users with the APInt class methods. NFCI

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• [APInt] Rewrite getLoBits in a way that will do one less memory allocation in the multiword case. Rewrite getHiBits to use the class method version of lshr instead of the one in APIntOps. NFCI

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• [APInt] Remove unused functions from the APIntOps namespace. The corresponding methods on the APInt object should be used instead. NFC

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