https://bugs.llvm.org/show_bug.cgi?id=51963
Bug ID: 51963
Summary: Simple intraprocedural DSE
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
__attribute__ ((noinline))
void
copy (int *a, int *b)
{
*a=*b;
}
void foo(int b)
{
int a = 42;
copy (&a,&b);
}
foo: # @foo
push rax
mov dword ptr [rsp + 4], edi
mov dword ptr [rsp], 42 <------- Useless store
mov rdi, rsp
lea rsi, [rsp + 4]
call copy
pop rax
ret
int p,q;
__attribute__ ((noinline, noclone))
int
test (int *p)
{
*p = 1;
}
int
test1()
{
q = 123;
test(&p);
return q;
}
test1: # @test1
push rax
mov dword ptr [rip + q], 123
mov edi, offset p
call test
mov eax, dword ptr [rip + q] // Can be mov eax, 123
pop rcx
ret
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