https://llvm.org/bugs/show_bug.cgi?id=28417
Bug ID: 28417
Summary: missing tailcall optimization
Product: libraries
Version: 3.8
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: vanya...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
For this code LLVM generates code that doesn't use tailcall optimization.
struct token
{
char const* tok_start;
char const* tok_end;
int tok_type;
unsigned identifier_hash;
};
token f();
token g()
{
return f();
}
Generated code:
g(): # @g()
pushq %rbx
movq %rdi, %rbx
callq f()
movq %rbx, %rax
popq %rbx
retq
Expected code:
g(): # @g()
jmpq f()
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