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Merge pull request #83 from biotty/memword

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Operate on word size as possible
This commit is contained in:
Jeremy Soller
2018-01-25 06:57:54 -07:00
committed by GitHub
parent f3205e6e34 c2e972f21a
commit 86ef2c4eb3
1 changed files with 8 additions and 4 deletions
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12
src/externs.rs
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@@ -16,7 +16,8 @@ pub unsafe extern fn memcpy(dest: *mut u8, src: *const u8,
let mut i: usize = 0;
// Copy `WORD_SIZE` bytes at a time
while i < n_usize {
let n_fast = n_usize*WORD_SIZE;
while i < n_fast {
*((dest as usize + i) as *mut usize) =
*((src as usize + i) as *const usize);
i += WORD_SIZE;
@@ -64,7 +65,8 @@ pub unsafe extern fn memmove(dest: *mut u8, src: *const u8,
let mut i: usize = 0;
// Copy `WORD_SIZE` bytes at a time
while i < n_usize {
let n_fast = n_usize*WORD_SIZE;
while i < n_fast {
*((dest as usize + i) as *mut usize) =
*((src as usize + i) as *const usize);
i += WORD_SIZE;
@@ -94,7 +96,8 @@ pub unsafe extern fn memset(dest: *mut u8, c: i32, n: usize) -> *mut u8 {
let mut i: usize = 0;
// Set `WORD_SIZE` bytes at a time
while i < n_usize {
let n_fast = n_usize*WORD_SIZE;
while i < n_fast {
*((dest as usize + i) as *mut usize) = c;
i += WORD_SIZE;
}
@@ -121,7 +124,8 @@ pub unsafe extern fn memcmp(s1: *const u8, s2: *const u8, n: usize) -> i32 {
let n_usize: usize = n/WORD_SIZE;
let mut i: usize = 0;
while i < n_usize {
let n_fast = n_usize*WORD_SIZE;
while i < n_fast {
let a = *((s1 as usize + i) as *const usize);
let b = *((s2 as usize + i) as *const usize);
if a != b {