https://bugs.llvm.org/show_bug.cgi?id=47420
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: unassignedb...@nondot.org
Reporter: slavomir.kuc...@broadcom.com
CC: llvm-bugs@lists.llvm.org, uweig...@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.
https://godbolt.org/z/q45ocv
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