diff options
Diffstat (limited to '3/7_procedures/34_long_p.c')
| -rw-r--r-- | 3/7_procedures/34_long_p.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/3/7_procedures/34_long_p.c b/3/7_procedures/34_long_p.c new file mode 100644 index 0000000..d058b77 --- /dev/null +++ b/3/7_procedures/34_long_p.c @@ -0,0 +1,34 @@ +// long P(long x) +// x in %rdi +// bx and bp, r12-15 are callee saved +// +// P: +// pushq %r15 +// pushq %r14 +// pushq %r13 +// pushq %r12 +// pushq %rbp +// pushq %rbx +// subq $24, %rsp Allocate 24 extra bytes +// +// movq %rdi, %rbx move first arg into rbx +// leaq 1(%rdi), %r15 move first arg into rbx +// leaq 2(%rdi), %r14 move first arg into rbx +// leaq 3(%rdi), %r13 move first arg into rbx +// leaq 4(%rdi), %r12 move first arg into rbx +// leaq 5(%rdi), %rbp move first arg into rbx +// leaq 6(%rdi), %rax move first arg into rbx +// movq %rax, (%rsp) save %rax in one of the three 8byte spots +// leaq 7(%rdi), %rdx move first arg into rdx +// movq %rdx, 8(%rsp) save %rdx in the second of the three 8byte spots +// movl $0, %eax set ax to zero? +// call Q +// ... +// +// A. x, x + 1, x + 2, x + 3, x + 4, x + 5 +// B. x + 6, x + 7 +// C. There were more than 6? +// +long P(long x) { + return 0; +} |