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Mirror of https://github.com/RPCS3/llvm-mirror
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Summary: Currently, the comparison argument used for ATOMIC_CMP_XCHG is legalised with GetPromotedInteger, which leaves the upper bits of the value undefind. Since this is used for comparing in an LR/SC loop with a full-width comparison, we must sign extend it. We introduce a new getExtendForAtomicCmpSwapArg to complement getExtendForAtomicOps, since many targets have compare-and-swap instructions (or pseudos) that correctly handle an any-extend input, and the existing function determines the extension of the result, whereas we are concerned with the input. This is related to https://reviews.llvm.org/D58829, which solved the issue for ATOMIC_CMP_SWAP_WITH_SUCCESS, but not the simpler ATOMIC_CMP_SWAP. Reviewers: asb, lenary, efriedma Reviewed By: asb Subscribers: arichardson, hiraditya, rbar, johnrusso, simoncook, sabuasal, niosHD, kito-cheng, shiva0217, MaskRay, zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o, rkruppe, jfb, PkmX, jocewei, psnobl, benna, Jim, s.egerton, pzheng, sameer.abuasal, apazos, luismarques, evandro, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D74453 |
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