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Diffstat (limited to 'newlib/libc/machine/arc64/memset.S')
| -rw-r--r-- | newlib/libc/machine/arc64/memset.S | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/newlib/libc/machine/arc64/memset.S b/newlib/libc/machine/arc64/memset.S new file mode 100644 index 0000000..88c8e09 --- /dev/null +++ b/newlib/libc/machine/arc64/memset.S @@ -0,0 +1,184 @@ +/* + Copyright (c) 2024, Synopsys, Inc. All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + + 1) Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + + 2) Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + 3) Neither the name of the Synopsys, Inc., nor the names of its contributors + may be used to endorse or promote products derived from this software + without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. +*/ + +#include <sys/asm.h> + +; This file contains variants of the same function with different +; instructions. The generic one, the implementation that comes the +; last after the #else macro, is the most commented. + +; Using 128-bit memory operations +#if defined (__ARC64_M128__) + +ENTRY (memset) + ;; Assemble 128b token + bmsk_s r1, r1, 7 + lsl8 r3, r1 + or_s r1, r1, r3 + lsl16 r3, r1 + or r6, r1, r3 + addhl r6, r6, r6 + movl r7, r6 + + lsrl.f r5, r2, 6 + beq.d @.L_write_63_bytes + movl r4, r0 +.L_write_64_bytes: + stdl.ab r6r7, [r4, +16] + stdl.ab r6r7, [r4, +16] + stdl.ab r6r7, [r4, +16] + dbnz.d r5, @.L_write_64_bytes + stdl.ab r6r7, [r4, +16] + bmsk_s r2, r2, 5 + +.L_write_63_bytes: + bbit0.d r2, 3, @1f + lsr r3, r2, 4 + stl.ab r6, [r4, 8] +1: + bbit0.d r2, 2, @1f + xor r3, r3, 3 + st.ab r6, [r4, 4] +1: + bbit0 r2, 1, @1f + sth.ab r6, [r4, 2] +1: + bbit0 r2, 0, @1f + stb.ab r6, [r4, 1] +1: + bi [r3] + stdl.ab r6r7,[r4, 16] + stdl.ab r6r7,[r4, 16] + stdl.ab r6r7,[r4, 16] + + j_s [blink] + +.L_write_1_bytes: + breq r2, 0, @.L_return + dbnz.d r2, @. + stb.ab r1, [r4, +1] +.L_return: + j_s [blink] +ENDFUNC (memset) + +; The generic 64-bit implementation without any frills. +#elif defined (__ARC64_ARCH64__) || defined (__ARC64_LL64__) + +#if defined (__ARC64_ARCH32__) +# define MOVH mov r7,r6 +#elif defined (__ARC64_ARCH64__) +# define MOVH addhl r6,r6,r6 +#else +# error Please use either 32-bit or 64-bit version of arc64 compiler +#endif + +; R0: dest +; R1: ch +; R2: count +; ret (R0): dest +ENTRY (memset) + ;; Assemble the bytes to 64bit words + bmsk_s r1, r1, 7 ; treat it like unsigned char + lsl8 r3, r1 + or_s r1, r1, r3 + lsl16 r3, r1 + or r6, r1, r3 + MOVH + + LSRP.f r5, r2, 5 ; counter for 32-byte chunks + beq.d @.L_write_31_bytes + MOVP r4, r0 ; work on a copy of "r0" +.L_write_32_bytes: + ST64.ab r6, [r4, +8] + ST64.ab r6, [r4, +8] + ST64.ab r6, [r4, +8] + dbnz.d r5, @.L_write_32_bytes + ST64.ab r6, [r4, +8] + bmsk_s r2, r2, 4 + +.L_write_31_bytes: + bbit0.d r2, 2, @1f + lsr r3, r2, 3 + st.ab r6, [r4, 4] +1: + bbit0.d r2, 1, @1f + xor r3, r3, 3 + sth.ab r6, [r4, 2] +1: + bbit0 r2, 0, @1f + stb.ab r6, [r4, 1] +1: + bi [r3] + ST64.ab r6,[r4, 8] + ST64.ab r6,[r4, 8] + ST64.ab r6,[r4, 8] + + j_s [blink] +ENDFUNC (memset) + +#elif defined (__ARC64_ARCH32__) +ENTRY (memset) + ;; Assemble the bytes to 32bit words + bmsk_s r1, r1, 7 ; treat it like unsigned char + lsl8 r3, r1 + or_s r1, r1, r3 + lsl16 r3, r1 + or r6, r1, r3 + + lsr.f r5, r2, 4 ; counter for 16-byte chunks + beq.d @.L_write_15_bytes + mov r4, r0 ; work on a copy of "r0" +.L_write_16_bytes: + st.ab r6, [r4, 4] + st.ab r6, [r4, 4] + st.ab r6, [r4, 4] + dbnz.d r5, @.L_write_16_bytes + st.ab r6, [r4, 4] + bmsk_s r2, r2, 3 + +.L_write_15_bytes: + bbit0.d r2, 1, @1f + lsr r3, r2, 2 + sth.ab r6, [r4, 2] +1: + bbit0.d r2, 0, @1f + xor r3, r3, 3 + stb.ab r6, [r4, 1] +1: + bi [r3] + st.ab r6,[r4, 4] + st.ab r6,[r4, 4] + st.ab r6,[r4, 4] + + j_s [blink] +ENDFUNC (memset) +#else +# error Unknown configuration +#endif |