[llvm-bugs] [Bug 47159] New: Failure to optimize malloc+memset to calloc

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47159

            Bug ID: 47159
           Summary: Failure to optimize malloc+memset to calloc
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: gabravier at gmail.com
                CC: llvm-bugs at lists.llvm.org

struct S
{
    int a;
};

struct S *f()
{
    struct S *p = (struct S *)malloc(sizeof(struct S));
    memset(p, 0, sizeof(*p));
    return p;
}

This can be optimized to `return calloc(sizeof(struct S), 1);`. This
transformation is done by GCC, but not by LLVM. See also
https://godbolt.org/z/MGzfGf.

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20200813/e5392e78/attachment.html>