std: more efficient inline assembly

1 files changed, 8 insertions, 18 deletions

diff --git a/std/std.zig b/std/std.zig
index d3ce4f976c..b0aa266be6 100644
--- a/std/std.zig
+++ b/std/std.zig
@@ -3,27 +3,17 @@ const SYS_exit : isize = 60;
 const stdout_fileno : isize = 1;
 
 fn syscall1(number: isize, arg1: isize) -> isize {
-    asm volatile ("
-        mov %[number], %%rax
-        mov %[arg1], %%rdi
-        syscall
-        mov %%rax, %[ret]"
-        : [ret] "=r" (return isize)
-        : [number] "r" (number), [arg1] "r" (arg1)
-        : "rcx", "r11", "rax", "rdi")
+    asm volatile ("syscall"
+        : [ret] "={rax}" (return isize)
+        : [number] "{rax}" (number), [arg1] "{rdi}" (arg1)
+        : "rcx", "r11")
 }
 
 fn syscall3(number: isize, arg1: isize, arg2: isize, arg3: isize) -> isize {
-    asm volatile ("
-        mov %[number], %%rax
-        mov %[arg1], %%rdi
-        mov %[arg2], %%rsi
-        mov %[arg3], %%rdx
-        syscall
-        mov %%rax, %[ret]"
-        : [ret] "=r" (return isize)
-        : [number] "r" (number), [arg1] "r" (arg1), [arg2] "r" (arg2), [arg3] "r" (arg3)
-        : "rcx", "r11", "rax", "rdi", "rsi", "rdx")
+    asm volatile ("syscall"
+        : [ret] "={rax}" (return isize)
+        : [number] "{rax}" (number), [arg1] "{rdi}" (arg1), [arg2] "{rsi}" (arg2), [arg3] "{rdx}" (arg3)
+        : "rcx", "r11")
 }
 
 pub fn write(fd: isize, buf: &const u8, count: usize) -> isize {