gas: Optimize variable reference on assembly

We were moving the stack data for variable reference to another stack
position ending up with two pointer to the same value.

    // a: i32 = 1;
    mov $1, -8(%rbp)
    // b: i32 = a;
    mov -8(%rbp), %rax
    mov %rax, -24(%rbp)
    mov -24(%rbp), %rax
    mov %rax, -16(%rbp)

After this changes, we wont create a new temp space on stack if we don't
need it. See bellow the example after the optimization:

    // a: i32 = 1;
    mov $1, -8(%rbp)
    // b: i32 = a;
    mov -8(%rbp), %rax
    mov %rax, -16(%rbp)

Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
Co-authored-by: Carlos Maniero <carlosmaniero@gmail.com>

0 files changed, 0 insertions, 0 deletions