[llvm-bugs] [Bug 36619] New: '-march=native' incorrectly emits VZEROUPPER with Knights Landing

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36619

            Bug ID: 36619
           Summary: '-march=native' incorrectly emits VZEROUPPER with
                    Knights Landing
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: dave at znu.io
                CC: llvm-bugs at lists.llvm.org

The following code compiled on Knights Landing incorrectly generates VZEROUPPER
with '-march=native', and correctly does NOT emit VZEROUPPER with '-march=knl':

class alignas(32) BigThing { int i[8]; };
void test(BigThing *in, BigThing *out) { *out = *in; }

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