https://bugs.llvm.org/show_bug.cgi?id=38862
Bug ID: 38862
Summary: Optimize pass struct by value to tail call
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: david.bolvan...@gmail.com
CC: llvm-bugs@lists.llvm.org
struct A {
int x[64];
};
void structByValue(A s);
void callStructByValue(A s) {
structByValue(s);
}
Clang:
callStructByValue(A): # @callStructByValue(A)
sub rsp, 264
lea rsi, [rsp + 272]
mov ecx, 32
mov rdi, rsp
rep movsq
call structByValue(A)
add rsp, 264
ret
GCC:
callStructByValue(A):
jmp structByValue(A)
If I change code to:
struct A {
int *x;
};
Clang tail calls it too.
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