diff options
Diffstat (limited to 'libc/string/xtensa/strcpy.S')
| -rw-r--r-- | libc/string/xtensa/strcpy.S | 91 |
1 files changed, 45 insertions, 46 deletions
diff --git a/libc/string/xtensa/strcpy.S b/libc/string/xtensa/strcpy.S index 108070384..9f42b34e6 100644 --- a/libc/string/xtensa/strcpy.S +++ b/libc/string/xtensa/strcpy.S @@ -13,11 +13,10 @@ Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 51 Franklin Street - Fifth Floor, - Boston, MA 02110-1301, USA. */ + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ -#include "../../sysdeps/linux/xtensa/sysdep.h" +#include <sysdep.h> #include <bits/xtensa-config.h> #ifdef __XTENSA_EB__ @@ -36,7 +35,7 @@ ENTRY (strcpy) /* a2 = dst, a3 = src */ - mov a10, a2 // leave dst in return value register + mov a10, a2 /* leave dst in return value register */ movi a4, MASK0 movi a5, MASK1 movi a6, MASK2 @@ -51,25 +50,25 @@ ENTRY (strcpy) j .Ldstunaligned -.Lsrc1mod2: // src address is odd - l8ui a8, a3, 0 // get byte 0 - addi a3, a3, 1 // advance src pointer - s8i a8, a10, 0 // store byte 0 - beqz a8, 1f // if byte 0 is zero - addi a10, a10, 1 // advance dst pointer - bbci.l a3, 1, .Lsrcaligned // if src is now word-aligned +.Lsrc1mod2: /* src address is odd */ + l8ui a8, a3, 0 /* get byte 0 */ + addi a3, a3, 1 /* advance src pointer */ + s8i a8, a10, 0 /* store byte 0 */ + beqz a8, 1f /* if byte 0 is zero */ + addi a10, a10, 1 /* advance dst pointer */ + bbci.l a3, 1, .Lsrcaligned /* if src is now word-aligned */ -.Lsrc2mod4: // src address is 2 mod 4 - l8ui a8, a3, 0 // get byte 0 +.Lsrc2mod4: /* src address is 2 mod 4 */ + l8ui a8, a3, 0 /* get byte 0 */ /* 1-cycle interlock */ - s8i a8, a10, 0 // store byte 0 - beqz a8, 1f // if byte 0 is zero - l8ui a8, a3, 1 // get byte 0 - addi a3, a3, 2 // advance src pointer - s8i a8, a10, 1 // store byte 0 - addi a10, a10, 2 // advance dst pointer + s8i a8, a10, 0 /* store byte 0 */ + beqz a8, 1f /* if byte 0 is zero */ + l8ui a8, a3, 1 /* get byte 0 */ + addi a3, a3, 2 /* advance src pointer */ + s8i a8, a10, 1 /* store byte 0 */ + addi a10, a10, 2 /* advance dst pointer */ bnez a8, .Lsrcaligned -1: retw +1: abi_ret /* dst is word-aligned; src is word-aligned. */ @@ -78,46 +77,46 @@ ENTRY (strcpy) #if XCHAL_HAVE_LOOPS /* (2 mod 4) alignment for loop instruction */ .Laligned: - _movi.n a8, 0 // set up for the maximum loop count - loop a8, .Lz3 // loop forever (almost anyway) - l32i a8, a3, 0 // get word from src - addi a3, a3, 4 // advance src pointer - bnone a8, a4, .Lz0 // if byte 0 is zero - bnone a8, a5, .Lz1 // if byte 1 is zero - bnone a8, a6, .Lz2 // if byte 2 is zero - s32i a8, a10, 0 // store word to dst - bnone a8, a7, .Lz3 // if byte 3 is zero - addi a10, a10, 4 // advance dst pointer + _movi.n a8, 0 /* set up for the maximum loop count */ + loop a8, .Lz3 /* loop forever (almost anyway) */ + l32i a8, a3, 0 /* get word from src */ + addi a3, a3, 4 /* advance src pointer */ + bnone a8, a4, .Lz0 /* if byte 0 is zero */ + bnone a8, a5, .Lz1 /* if byte 1 is zero */ + bnone a8, a6, .Lz2 /* if byte 2 is zero */ + s32i a8, a10, 0 /* store word to dst */ + bnone a8, a7, .Lz3 /* if byte 3 is zero */ + addi a10, a10, 4 /* advance dst pointer */ #else /* !XCHAL_HAVE_LOOPS */ -1: addi a10, a10, 4 // advance dst pointer +1: addi a10, a10, 4 /* advance dst pointer */ .Laligned: - l32i a8, a3, 0 // get word from src - addi a3, a3, 4 // advance src pointer - bnone a8, a4, .Lz0 // if byte 0 is zero - bnone a8, a5, .Lz1 // if byte 1 is zero - bnone a8, a6, .Lz2 // if byte 2 is zero - s32i a8, a10, 0 // store word to dst - bany a8, a7, 1b // if byte 3 is zero + l32i a8, a3, 0 /* get word from src */ + addi a3, a3, 4 /* advance src pointer */ + bnone a8, a4, .Lz0 /* if byte 0 is zero */ + bnone a8, a5, .Lz1 /* if byte 1 is zero */ + bnone a8, a6, .Lz2 /* if byte 2 is zero */ + s32i a8, a10, 0 /* store word to dst */ + bany a8, a7, 1b /* if byte 3 is zero */ #endif /* !XCHAL_HAVE_LOOPS */ .Lz3: /* Byte 3 is zero. */ - retw + abi_ret .Lz0: /* Byte 0 is zero. */ #ifdef __XTENSA_EB__ movi a8, 0 #endif s8i a8, a10, 0 - retw + abi_ret .Lz1: /* Byte 1 is zero. */ #ifdef __XTENSA_EB__ extui a8, a8, 16, 16 #endif s16i a8, a10, 0 - retw + abi_ret .Lz2: /* Byte 2 is zero. */ #ifdef __XTENSA_EB__ @@ -126,15 +125,15 @@ ENTRY (strcpy) s16i a8, a10, 0 movi a8, 0 s8i a8, a10, 2 - retw + abi_ret .align 4 /* (2 mod 4) alignment for loop instruction */ .Ldstunaligned: #if XCHAL_HAVE_LOOPS - _movi.n a8, 0 // set up for the maximum loop count - loop a8, 2f // loop forever (almost anyway) + _movi.n a8, 0 /* set up for the maximum loop count */ + loop a8, 2f /* loop forever (almost anyway) */ #endif 1: l8ui a8, a3, 0 addi a3, a3, 1 @@ -145,6 +144,6 @@ ENTRY (strcpy) #else bnez a8, 1b #endif -2: retw +2: abi_ret libc_hidden_def (strcpy) |