[llvm-bugs] [Bug 37448] New: [llvm-exegesis] Include specific EFLAGS in the test code

via llvm-bugs llvm-bugs at lists.llvm.org
Mon May 14 03:12:49 PDT 2018


https://bugs.llvm.org/show_bug.cgi?id=37448

            Bug ID: 37448
           Summary: [llvm-exegesis] Include specific EFLAGS in the test
                    code
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: andrea.dibiagio at gmail.com, clement.courbet at gmail.com,
                    craig.topper at gmail.com, gchatelet at google.com,
                    llvm-bugs at lists.llvm.org, spatel+llvm at rotateright.com

The test values for CMOVA/CMOVBE are underestimating the latency on SNB+
targets as it isn't handling the fact that those targets can update the EFLAGS
C bit independently from the OSPAZ bits.

These CMOV variants depend on the C and Z flags and thus need to be tested in
cases where both are touched.

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