| author |  Joachim Henke <37883863+jo-he@users.noreply.github.com> 2019-07-26 09:59:18+02:00 |
| committer |  Andrew Kelley <andrew@ziglang.org> 2019-07-26 17:12:42-04:00 |
| log | 74abc5ad2f4bf4f737b6c910b3048f7937345aad |
| tree | 73ee932c304233eaa78ac237aa8564e33a15d141 |
| parent | 9e11f67f0d921ed1280dc39e991163053be8a9ee |
avoid a register copy when fetching the stack pointer in _start
1 files changed, 4 insertions(+), 4 deletions(-)
std- special
std/special/start.zig+4-4
| ... | ... | @@ -35,13 +35,13 @@ nakedcc fn _start() noreturn { |
| 35 | 35 | |
| 36 | 36 | switch (builtin.arch) { |
| 37 | 37 | .x86_64 => { |
| 38 | argc_ptr = asm ("lea (%%rsp), %[argc]" | |
| 39 | : [argc] "=r" (-> [*]usize) | |
| 38 | argc_ptr = asm ("" | |
| 39 | : [argc] "={rsp}" (-> [*]usize) | |
| 40 | 40 | ); |
| 41 | 41 | }, |
| 42 | 42 | .i386 => { |
| 43 | argc_ptr = asm ("lea (%%esp), %[argc]" | |
| 44 | : [argc] "=r" (-> [*]usize) | |
| 43 | argc_ptr = asm ("" | |
| 44 | : [argc] "={esp}" (-> [*]usize) | |
| 45 | 45 | ); |
| 46 | 46 | }, |
| 47 | 47 | .aarch64, .aarch64_be => { |