[llvm-bugs] [Bug 25270] New: llc produces incorrect assembler for knl

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25270

            Bug ID: 25270
           Summary: llc produces incorrect assembler for knl
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llc
          Assignee: unassignedbugs at nondot.org
          Reporter: Vsevolod.Livinskij at frtk.ru
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15130
  --> https://llvm.org/bugs/attachment.cgi?id=15130&action=edit
Reproducer (foo.ll is miscompiled).

llc produces incorrect assembler for knl. It tries to reuse the %var in two
Print calls, despite its value has changed. llc probably optimized away the
register spill of %var_load_load by reloading it. This bug occurs in foo.ll
file.

Compile:
llc -mcpu=knl call.ll
llc -mcpu=knl foo.ll
clang++ -march=knl foo.s call.s main.cpp
Run: sde -knl -- ./a.out

LLVM revision #250620

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