On Sat, Aug 5, 2017 at 4:35 PM, Craig Topper via cfe-commits <cfe-commits@lists.llvm.org> wrote: > Author: ctopper > Date: Sat Aug 5 16:35:54 2017 > New Revision: 310191 > > URL: http://llvm.org/viewvc/llvm-project?rev=310191&view=rev > Log: > [X86] Enable isel to use the PAUSE instruction even when SSE2 is disabled. > Clang part > > Summary: > On older processors this instruction encoding is treated as a NOP. > > MSVC doesn't disable intrinsics based on features the way clang/gcc does. > Because the PAUSE instruction encoding doesn't crash older processors, some > software out there uses these intrinsics without checking for SSE2. > > This change also seems to also be consistent with gcc behavior. > > Fixes PR34079 > > Reviewers: RKSimon, zvi > > Reviewed By: RKSimon > > Subscribers: cfe-commits > > Differential Revision: https://reviews.llvm.org/D36362
Merged to 5.0 in r310294. _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
