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Check alignment and enable -O3

This commit is contained in:
Arun Prakash Jana 2017-12-29 11:08:07 +05:30
parent 9b010b1c03
commit 3a88e31a0e
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GPG Key ID: A75979F35C080412
2 changed files with 11 additions and 12 deletions
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4
Makefile
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@ -3,7 +3,7 @@ VERSION = 1.6
PREFIX ?= /usr/local
MANPREFIX = $(PREFIX)/share/man
CFLAGS += -Wall -Wextra -Wno-unused-parameter
CFLAGS += -O3 -Wall -Wextra -Wno-unused-parameter
LDLIBS = -lreadline
ifeq ($(shell pkg-config ncursesw && echo 1),1)
@ -23,7 +23,7 @@ all: $(BIN) $(PLAYER)
$(SRC): nnn.h
$(BIN): $(SRC)
$(CC) -O2 $(CFLAGS) -o $@ $^ $(LDFLAGS) $(LDLIBS)
$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS) $(LDLIBS)
strip $@
debug: $(SRC)

19
nnn.c
View File

@ -357,11 +357,12 @@ xstrlen(const char *s)
static size_t
xstrlcpy(char *dest, const char *src, size_t n)
{
static ulong *s, *d;
static size_t len, blocks;
static const uint lsize = sizeof(ulong);
static const uint _WSHIFT = (sizeof(ulong) == 8) ? 3 : 2;
if (!src || !dest)
if (!src || !dest || !n)
return 0;
len = xstrlen(src) + 1;
@ -371,17 +372,15 @@ xstrlcpy(char *dest, const char *src, size_t n)
/* Save total number of bytes to copy in len */
len = n;
if (n >= lsize) {
blocks = n >> _WSHIFT;
n -= (blocks << _WSHIFT);
} else
blocks = 0;
if (blocks) {
static ulong *s, *d;
/*
* To enable -O3 ensure src and dest are 16-byte aligned
* More info: http://www.felixcloutier.com/x86/MOVDQA.html
*/
if ((n >= lsize) && !((ulong)src & (ulong)dest & 0xF)) {
s = (ulong *)src;
d = (ulong *)dest;
blocks = n >> _WSHIFT;
n -= (blocks << _WSHIFT);
while (blocks) {
*d = *s;