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Summary: There are a LOT of Skylakes and later without TSX-NI. Examples: - SKL: https://ark.intel.com/products/136863/Intel-Core-i3-8121U-Processor-4M-Cache-up-to-3-20-GHz- - KBL: https://ark.intel.com/products/97540/Intel-Core-i7-7560U-Processor-4M-Cache-up-to-3-80-GHz- - KBL-R: https://ark.intel.com/products/149091/Intel-Core-i7-8565U-Processor-8M-Cache-up-to-4-60-GHz- - CNL: https://ark.intel.com/products/136863/Intel-Core-i3-8121U-Processor-4M-Cache-up-to-3_20-GHz This feature seems to be present only on high-end desktop and server chips (I can't find any SKX without). This commit leaves it disabled for all processors, but can be re-enabled for specific builds with -mrtm. Patch by Thiago Macieira Reviewers: erichkeane, craig.topper Reviewed By: craig.topper Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D53041 llvm-svn: 344116
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