[llvm-bugs] [Bug 42922] New: [X86] Cmov converter pass sinks volatile loads

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https://bugs.llvm.org/show_bug.cgi?id=42922

            Bug ID: 42922
           Summary: [X86] Cmov converter pass sinks volatile loads
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: craig.topper at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

When the cmov converter pass expands a volatile load that has been folded with
a cmov, it places the load only on the false path of the created control flow.
But a volatile load should be executed unconditionally. The original cmov
instruction would have always executed the load.

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