[llvm-bugs] [Bug 32566] New: x86: No patterns for matching bit-test and set

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Apr 7 09:38:25 PDT 2017


            Bug ID: 32566
           Summary: x86: No patterns for matching bit-test and set
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: hans at chromium.org
                CC: llvm-bugs at lists.llvm.org

The .td files have entries for BTS instructions, but no patterns to match them.

In particular, for the _interlockedbittestandset intrinsic, we do the whole
"lock cmpxchg" dance instead of "lock bts".

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