[llvm-bugs] [Bug 47420] New: [SystemZ] '0 == memcmp(...)' not optimized anymore

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Sep 4 09:40:48 PDT 2020


            Bug ID: 47420
           Summary: [SystemZ] '0 == memcmp(...)' not optimized anymore
           Product: libraries
           Version: trunk
          Hardware: PC
               URL: https://godbolt.org/z/q45ocv
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: SystemZ
          Assignee: unassignedbugs at nondot.org
          Reporter: slavomir.kucera at broadcom.com
                CC: llvm-bugs at lists.llvm.org, uweigand at de.ibm.com

Starting with LLVM 9, the following code

int test1(const char* l, const char* r) {
    return memcmp(l,r,2) == 0;

is basically transformed into 

int test1(const char* l, const char* r) {
    return bcmp(l,r,2) == 0;

which is not optimized by the SystemZ backend anymore - an actual function call
is generated.


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