[llvm-bugs] [Bug 46821] New: Failure to optimize memcpy pattern
via llvm-bugs
llvm-bugs at lists.llvm.org
Thu Jul 23 08:06:57 PDT 2020
https://bugs.llvm.org/show_bug.cgi?id=46821
Bug ID: 46821
Summary: Failure to optimize memcpy pattern
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
void f(char *restrict p, char *restrict q, size_t n)
{
while (n-- > 0)
*p++ = *q++;
}
This can be optimized to `if (n) memcpy(p, q, n);`. This transformation is done
by GCC, but not by LLVM
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