diff options
Diffstat (limited to 'libc/string/xtensa/strncpy.S')
| -rw-r--r-- | libc/string/xtensa/strncpy.S | 150 |
1 files changed, 75 insertions, 75 deletions
diff --git a/libc/string/xtensa/strncpy.S b/libc/string/xtensa/strncpy.S index 7ba2ef77d..fe3ec894c 100644 --- a/libc/string/xtensa/strncpy.S +++ b/libc/string/xtensa/strncpy.S @@ -41,29 +41,29 @@ .literal_position __strncpy_aux: -.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 - addi a4, a4, -1 // decrement n - beqz a4, .Lret // if n is zero - addi a10, a10, 1 // advance dst pointer - beqz a8, .Lfill // if byte 0 is zero - 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 - addi a4, a4, -1 // decrement n - s8i a8, a10, 0 // store byte 0 - beqz a4, .Lret // if n is zero - addi a10, a10, 1 // advance dst pointer - beqz a8, .Lfill // if byte 0 is zero - l8ui a8, a3, 1 // get byte 0 - addi a3, a3, 2 // advance src pointer - s8i a8, a10, 0 // store byte 0 - addi a4, a4, -1 // decrement n - beqz a4, .Lret // if n is zero - addi a10, a10, 1 // advance dst pointer +.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 */ + addi a4, a4, -1 /* decrement n */ + beqz a4, .Lret /* if n is zero */ + addi a10, a10, 1 /* advance dst pointer */ + beqz a8, .Lfill /* if byte 0 is zero */ + 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 */ + addi a4, a4, -1 /* decrement n */ + s8i a8, a10, 0 /* store byte 0 */ + beqz a4, .Lret /* if n is zero */ + addi a10, a10, 1 /* advance dst pointer */ + beqz a8, .Lfill /* if byte 0 is zero */ + l8ui a8, a3, 1 /* get byte 0 */ + addi a3, a3, 2 /* advance src pointer */ + s8i a8, a10, 0 /* store byte 0 */ + addi a4, a4, -1 /* decrement n */ + beqz a4, .Lret /* if n is zero */ + addi a10, a10, 1 /* advance dst pointer */ bnez a8, .Lsrcaligned j .Lfill @@ -74,8 +74,8 @@ __strncpy_aux: ENTRY (strncpy) /* a2 = dst, a3 = src */ - mov a10, a2 // leave dst in return value register - beqz a4, .Lret // if n is zero + mov a10, a2 /* leave dst in return value register */ + beqz a4, .Lret /* if n is zero */ movi a11, MASK0 movi a5, MASK1 @@ -125,28 +125,28 @@ ENTRY (strncpy) .Lfillcleanup: /* Fill leftover (1 to 3) bytes with zero. */ - s8i a9, a10, 0 // store byte 0 - addi a4, a4, -1 // decrement n + s8i a9, a10, 0 /* store byte 0 */ + addi a4, a4, -1 /* decrement n */ addi a10, a10, 1 - bnez a4, .Lfillcleanup + bnez a4, .Lfillcleanup 2: retw - -.Lfill1mod2: // dst address is odd - s8i a9, a10, 0 // store byte 0 - addi a4, a4, -1 // decrement n - beqz a4, 2b // if n is zero - addi a10, a10, 1 // advance dst pointer - bbci.l a10, 1, .Lfillaligned // if dst is now word-aligned - -.Lfill2mod4: // dst address is 2 mod 4 - s8i a9, a10, 0 // store byte 0 - addi a4, a4, -1 // decrement n - beqz a4, 2b // if n is zero - s8i a9, a10, 1 // store byte 1 - addi a4, a4, -1 // decrement n - beqz a4, 2b // if n is zero - addi a10, a10, 2 // advance dst pointer + +.Lfill1mod2: /* dst address is odd */ + s8i a9, a10, 0 /* store byte 0 */ + addi a4, a4, -1 /* decrement n */ + beqz a4, 2b /* if n is zero */ + addi a10, a10, 1 /* advance dst pointer */ + bbci.l a10, 1, .Lfillaligned /* if dst is now word-aligned */ + +.Lfill2mod4: /* dst address is 2 mod 4 */ + s8i a9, a10, 0 /* store byte 0 */ + addi a4, a4, -1 /* decrement n */ + beqz a4, 2b /* if n is zero */ + s8i a9, a10, 1 /* store byte 1 */ + addi a4, a4, -1 /* decrement n */ + beqz a4, 2b /* if n is zero */ + addi a10, a10, 2 /* advance dst pointer */ j .Lfillaligned @@ -156,32 +156,32 @@ ENTRY (strncpy) /* (2 mod 4) alignment for loop instruction */ .Laligned: #if XCHAL_HAVE_LOOPS - _movi.n a8, 0 // set up for the maximum loop count - loop a8, 1f // loop forever (almost anyway) - blti a4, 5, .Ldstunaligned // n is near limit; do one at a time - l32i a8, a3, 0 // get word from src - addi a3, a3, 4 // advance src pointer - bnone a8, a11, .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 - addi a4, a4, -4 // decrement n - addi a10, a10, 4 // advance dst pointer - bnone a8, a7, .Lfill // if byte 3 is zero -1: + _movi.n a8, 0 /* set up for the maximum loop count */ + loop a8, 1f /* loop forever (almost anyway) */ + blti a4, 5, .Ldstunaligned /* n is near limit; do one at a time */ + l32i a8, a3, 0 /* get word from src */ + addi a3, a3, 4 /* advance src pointer */ + bnone a8, a11, .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 */ + addi a4, a4, -4 /* decrement n */ + addi a10, a10, 4 /* advance dst pointer */ + bnone a8, a7, .Lfill /* if byte 3 is zero */ +1: #else /* !XCHAL_HAVE_LOOPS */ -1: blti a4, 5, .Ldstunaligned // n is near limit; do one at a time - l32i a8, a3, 0 // get word from src - addi a3, a3, 4 // advance src pointer - bnone a8, a11, .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 - addi a4, a4, -4 // decrement n - addi a10, a10, 4 // advance dst pointer - bany a8, a7, 1b // no zeroes +1: blti a4, 5, .Ldstunaligned /* n is near limit; do one at a time */ + l32i a8, a3, 0 /* get word from src */ + addi a3, a3, 4 /* advance src pointer */ + bnone a8, a11, .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 */ + addi a4, a4, -4 /* decrement n */ + addi a10, a10, 4 /* advance dst pointer */ + bany a8, a7, 1b /* no zeroes */ #endif /* !XCHAL_HAVE_LOOPS */ j .Lfill @@ -191,8 +191,8 @@ ENTRY (strncpy) movi a8, 0 #endif s8i a8, a10, 0 - addi a4, a4, -1 // decrement n - addi a10, a10, 1 // advance dst pointer + addi a4, a4, -1 /* decrement n */ + addi a10, a10, 1 /* advance dst pointer */ j .Lfill .Lz1: /* Byte 1 is zero. */ @@ -200,8 +200,8 @@ ENTRY (strncpy) extui a8, a8, 16, 16 #endif s16i a8, a10, 0 - addi a4, a4, -2 // decrement n - addi a10, a10, 2 // advance dst pointer + addi a4, a4, -2 /* decrement n */ + addi a10, a10, 2 /* advance dst pointer */ j .Lfill .Lz2: /* Byte 2 is zero. */ @@ -211,8 +211,8 @@ ENTRY (strncpy) s16i a8, a10, 0 movi a8, 0 s8i a8, a10, 2 - addi a4, a4, -3 // decrement n - addi a10, a10, 3 // advance dst pointer + addi a4, a4, -3 /* decrement n */ + addi a10, a10, 3 /* advance dst pointer */ j .Lfill .align 4 @@ -220,8 +220,8 @@ ENTRY (strncpy) .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 |