https://bugs.llvm.org/show_bug.cgi?id=48508
Bug ID: 48508
Summary: Failure to optimize code converted to memset call into
tail call
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: gabrav...@gmail.com
CC: llvm-bugs@lists.llvm.org
void f(char *d, size_t c)
{
while (c-- > 0)
*d++ = 0;
}
This code can be optimized to using `memset`. It can also be further optimize
to optimize out the call to `memset` to a tail call. This transformation is
done by GCC, but not by LLVM.
Comparison here : https://godbolt.org/z/sjP8P8
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