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Success Build clang-r366637-t58147-b58147.tar.gz (Jul 20, 2019 11:51:51 AM)


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Build Log

Revision: 366290
  1. [Codegen][SelectionDAG] X u% C == 0 fold: non-splat vector improvements

    Four things here:
    1. Generalize the fold to handle non-splat divisors. Reasonably trivial.
    2. Unban power-of-two divisors. I don't see any reason why they should
       be illegal.
       * There is no ban in Hacker's Delight
       * I think the ban came from the same bug that caused the miscompile
          in the base patch - in `floor((2^W - 1) / D)` we were dividing by
          `D0` instead of `D`, and we **were** ensuring that `D0` is not `1`,
          which made sense.
    3. Unban `1` divisors. I no longer believe Hacker's Delight actually says
       that the fold is invalid for `D = 0`. Further considerations:
       * We know that
         * `(X u% 1) == 0`  can be constant-folded to `1`,
         * `(X u% 1) != 0`  can be constant-folded to `0`,
       *  Also, we know that
         * `X u<= -1` can be constant-folded to `1`,
         * `X u>  -1` can be constant-folded to `0`,
       * We know will end up with the following:
           `(setule/setugt (rotr (mul N, P), K), Q)`
       * Therefore, for given new DAG nodes and comparison predicates
         (`ule`/`ugt`), we will still produce the correct answer if:
         `Q` is a all-ones constant; and both `P` and `K` are *anything*
         other than `undef`.
       * The fold will indeed produce `Q = all-ones`.
    4. Try to re-splat the `P` and `K` vectors - we don't care about
       their values for the lanes where divisor was `1`.

    Reviewers: RKSimon, hermord, craig.topper, spatel, xbolva00

    Reviewed By: RKSimon

    Subscribers: hiraditya, javed.absar, dexonsmith, llvm-commits

    Tags: #llvm

    Differential Revision: (detail)
    by lebedevri
  2. [X86][SSE] Use PSADBW to improve vXi8 sum reduction (PR42674)

    As detailed on PR42674, we can reduce a vXi8 down until we have the final <8 x i8>, and then use PSADBW with zero, to sum those values. We then extract the bottom i8, discarding any overflow from the upper bits of the i16 result. (detail)
    by rksimon
Revision: 366290
  1. Fix cppcheck reduce scope variable warnings. NFCI

    Move a couple of variables inside the block where they are actually needed. (detail)
    by rksimon
Revision: 366290
  1. Revert "Fix asan infinite loop on undefined symbol"

    This reverts commit cbd28cd05bb11e9d76d71c6cc2d38d89dbb1fe1a.

    Buildbot fail: (detail)
    by serge_sans_paille

Started by upstream project relay-test-suite-verify-machineinstrs build number 5619
originally caused by:

This run spent:

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