Hexagon: Add memcpy and memset accelerated functions

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 543 insertions, 0 deletions

diff --git a/arch/hexagon/lib/memcpy.S b/arch/hexagon/lib/memcpy.S
new file mode 100644
index 000000000000..2101c3395665
--- /dev/null
+++ b/arch/hexagon/lib/memcpy.S
@@ -0,0 +1,543 @@
+/*
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/*
+ * Description
+ *
+ *   library function for memcpy where length bytes are copied from
+ *   ptr_in to ptr_out. ptr_out is returned unchanged.
+ *   Allows any combination of alignment on input and output pointers
+ *   and length from 0 to 2^32-1
+ *
+ * Restrictions
+ *   The arrays should not overlap, the program will produce undefined output
+ *   if they do.
+ *   For blocks less than 16 bytes a byte by byte copy is performed. For
+ *   8byte alignments, and length multiples, a dword copy is performed up to
+ *   96bytes
+ * History
+ *
+ *   DJH  5/15/09 Initial version 1.0
+ *   DJH  6/ 1/09 Version 1.1 modified ABI to inlcude R16-R19
+ *   DJH  7/12/09 Version 1.2 optimized codesize down to 760 was 840
+ *   DJH 10/14/09 Version 1.3 added special loop for aligned case, was
+ *                            overreading bloated codesize back up to 892
+ *   DJH  4/20/10 Version 1.4 fixed Ldword_loop_epilog loop to prevent loads
+ *                            occuring if only 1 left outstanding, fixes bug
+ *                            # 3888, corrected for all alignments. Peeled off
+ *                            1 32byte chunk from kernel loop and extended 8byte
+ *                            loop at end to solve all combinations and prevent
+ *                            over read.  Fixed Ldword_loop_prolog to prevent
+ *                            overread for blocks less than 48bytes. Reduced
+ *                            codesize to 752 bytes
+ *   DJH  4/21/10 version 1.5 1.4 fix broke code for input block ends not
+ *                            aligned to dword boundaries,underwriting by 1
+ *                            byte, added detection for this and fixed. A
+ *                            little bloat.
+ *   DJH  4/23/10 version 1.6 corrected stack error, R20 was not being restored
+ *                            always, fixed the error of R20 being modified
+ *                            before it was being saved
+ * Natural c model
+ * ===============
+ * void * memcpy(char * ptr_out, char * ptr_in, int length) {
+ *   int i;
+ *   if(length) for(i=0; i < length; i++) { ptr_out[i] = ptr_in[i]; }
+ *   return(ptr_out);
+ * }
+ *
+ * Optimized memcpy function
+ * =========================
+ * void * memcpy(char * ptr_out, char * ptr_in, int len) {
+ *   int i, prolog, kernel, epilog, mask;
+ *   u8 offset;
+ *   s64 data0, dataF8, data70;
+ *
+ *   s64 * ptr8_in;
+ *   s64 * ptr8_out;
+ *   s32 * ptr4;
+ *   s16 * ptr2;
+ *
+ *   offset = ((int) ptr_in) & 7;
+ *   ptr8_in = (s64 *) &ptr_in[-offset];   //read in the aligned pointers
+ *
+ *   data70 = *ptr8_in++;
+ *   dataF8 = *ptr8_in++;
+ *
+ *   data0 = HEXAGON_P_valignb_PPp(dataF8, data70, offset);
+ *
+ *   prolog = 32 - ((int) ptr_out);
+ *   mask  = 0x7fffffff >> HEXAGON_R_cl0_R(len);
+ *   prolog = prolog & mask;
+ *   kernel = len - prolog;
+ *   epilog = kernel & 0x1F;
+ *   kernel = kernel>>5;
+ *
+ *   if (prolog & 1) { ptr_out[0] = (u8) data0; data0 >>= 8; ptr_out += 1;}
+ *   ptr2 = (s16 *) &ptr_out[0];
+ *   if (prolog & 2) { ptr2[0] = (u16) data0;  data0 >>= 16; ptr_out += 2;}
+ *   ptr4 = (s32 *) &ptr_out[0];
+ *   if (prolog & 4) { ptr4[0] = (u32) data0;  data0 >>= 32; ptr_out += 4;}
+ *
+ *   offset = offset + (prolog & 7);
+ *   if (offset >= 8) {
+ *     data70 = dataF8;
+ *     dataF8 = *ptr8_in++;
+ *   }
+ *   offset = offset & 0x7;
+ *
+ *   prolog = prolog >> 3;
+ *   if (prolog) for (i=0; i < prolog; i++) {
+ *       data0 = HEXAGON_P_valignb_PPp(dataF8, data70, offset);
+ *       ptr8_out = (s64 *) &ptr_out[0]; *ptr8_out = data0; ptr_out += 8;
+ *       data70 = dataF8;
+ *       dataF8 = *ptr8_in++;
+ *   }
+ *   if(kernel) { kernel -= 1; epilog += 32; }
+ *   if(kernel) for(i=0; i < kernel; i++) {
+ *       data0 = HEXAGON_P_valignb_PPp(dataF8, data70, offset);
+ *       ptr8_out = (s64 *) &ptr_out[0]; *ptr8_out = data0; ptr_out += 8;
+ *       data70 = *ptr8_in++;
+ *
+ *       data0 = HEXAGON_P_valignb_PPp(data70, dataF8, offset);
+ *       ptr8_out = (s64 *) &ptr_out[0]; *ptr8_out = data0; ptr_out += 8;
+ *       dataF8 = *ptr8_in++;
+ *
+ *       data0 = HEXAGON_P_valignb_PPp(dataF8, data70, offset);
+ *       ptr8_out = (s64 *) &ptr_out[0]; *ptr8_out = data0; ptr_out += 8;
+ *       data70 = *ptr8_in++;
+ *
+ *       data0 = HEXAGON_P_valignb_PPp(data70, dataF8, offset);
+ *       ptr8_out = (s64 *) &ptr_out[0]; *ptr8_out = data0; ptr_out += 8;
+ *       dataF8 = *ptr8_in++;
+ *   }
+ *   epilogdws = epilog >> 3;
+ *   if (epilogdws) for (i=0; i < epilogdws; i++) {
+ *       data0 = HEXAGON_P_valignb_PPp(dataF8, data70, offset);
+ *       ptr8_out = (s64 *) &ptr_out[0]; *ptr8_out = data0; ptr_out += 8;
+ *       data70 = dataF8;
+ *       dataF8 = *ptr8_in++;
+ *   }
+ *   data0 = HEXAGON_P_valignb_PPp(dataF8, data70, offset);
+ *
+ *   ptr4 = (s32 *) &ptr_out[0];
+ *   if (epilog & 4) { ptr4[0] = (u32) data0; data0 >>= 32; ptr_out += 4;}
+ *   ptr2 = (s16 *) &ptr_out[0];
+ *   if (epilog & 2) { ptr2[0] = (u16) data0; data0 >>= 16; ptr_out += 2;}
+ *   if (epilog & 1) { *ptr_out++ = (u8) data0; }
+ *
+ *   return(ptr_out - length);
+ * }
+ *
+ * Codesize : 784 bytes
+ */
+
+
+#define ptr_out         R0      /*  destination  pounter  */
+#define ptr_in          R1      /*  source pointer  */
+#define len             R2      /*  length of copy in bytes  */
+
+#define data70          R13:12  /*  lo 8 bytes of non-aligned transfer  */
+#define dataF8          R11:10  /*  hi 8 bytes of non-aligned transfer  */
+#define ldata0          R7:6    /*  even 8 bytes chunks  */
+#define ldata1          R25:24  /*  odd 8 bytes chunks  */
+#define data1           R7      /*  lower 8 bytes of ldata1  */
+#define data0           R6      /*  lower 8 bytes of ldata0  */
+
+#define ifbyte          p0      /*  if transfer has bytes in epilog/prolog  */
+#define ifhword         p0      /*  if transfer has shorts in epilog/prolog  */
+#define ifword          p0      /*  if transfer has words in epilog/prolog  */
+#define noprolog        p0      /*  no prolog, xfer starts at 32byte  */
+#define nokernel        p1      /*  no 32byte multiple block in the transfer  */
+#define noepilog        p0      /*  no epilog, xfer ends on 32byte boundary  */
+#define align           p2      /*  alignment of input rel to 8byte boundary  */
+#define kernel1         p0      /*  kernel count == 1  */
+
+#define dalign          R25     /*  rel alignment of input to output data  */
+#define star3           R16     /*  number bytes in prolog - dwords  */
+#define rest            R8      /*  length - prolog bytes  */
+#define back            R7      /*  nr bytes > dword boundary in src block  */
+#define epilog          R3      /*  bytes in epilog  */
+#define inc             R15:14  /*  inc kernel by -1 and defetch ptr by 32  */
+#define kernel          R4      /*  number of 32byte chunks in kernel  */
+#define ptr_in_p_128    R5      /*  pointer for prefetch of input data  */
+#define mask            R8      /*  mask used to determine prolog size  */
+#define shift           R8      /*  used to work a shifter to extract bytes  */
+#define shift2          R5      /*  in epilog to workshifter to extract bytes */
+#define prolog          R15     /*  bytes in  prolog  */
+#define epilogdws       R15     /*  number dwords in epilog  */
+#define shiftb          R14     /*  used to extract bytes  */
+#define offset          R9      /*  same as align in reg  */
+#define ptr_out_p_32    R17     /*  pointer to output dczero  */
+#define align888        R14     /*  if simple dword loop can be used  */
+#define len8            R9      /*  number of dwords in length  */
+#define over            R20     /*  nr of bytes > last inp buf dword boundary */
+
+#define ptr_in_p_128kernel      R5:4    /*  packed fetch pointer & kernel cnt */
+
+        .section .text
+        .p2align 4
+        .global memcpy
+        .type memcpy, @function
+memcpy:
+{
+        p2 = cmp.eq(len, #0);           /*  =0 */
+        align888 = or(ptr_in, ptr_out); /*  %8 < 97 */
+        p0 = cmp.gtu(len, #23);         /*  %1, <24 */
+        p1 = cmp.eq(ptr_in, ptr_out);   /*  attempt to overwrite self */
+}
+{
+        p1 = or(p2, p1);
+        p3 = cmp.gtu(len, #95);         /*  %8 < 97 */
+        align888 = or(align888, len);   /*  %8 < 97 */
+        len8 = lsr(len, #3);            /*  %8 < 97 */
+}
+{
+        dcfetch(ptr_in);                /*  zero/ptrin=ptrout causes fetch */
+        p2 = bitsclr(align888, #7);     /*  %8 < 97  */
+        if(p1) jumpr r31;               /*  =0  */
+}
+{
+        p2 = and(p2,!p3);                       /*  %8 < 97  */
+        if (p2.new) len = add(len, #-8);        /*  %8 < 97  */
+        if (p2.new) jump:NT .Ldwordaligned;     /*  %8 < 97  */
+}
+{
+        if(!p0) jump .Lbytes23orless;   /*  %1, <24  */
+        mask.l = #LO(0x7fffffff);
+        /*  all bytes before line multiples of data  */
+        prolog = sub(#0, ptr_out);
+}
+{
+        /*  save r31 on stack, decrement sp by 16  */
+        allocframe(#24);
+        mask.h = #HI(0x7fffffff);
+        ptr_in_p_128 = add(ptr_in, #32);
+        back = cl0(len);
+}
+{
+        memd(sp+#0) = R17:16;           /*  save r16,r17 on stack6  */
+        r31.l = #LO(.Lmemcpy_return);   /*  set up final return pointer  */
+        prolog &= lsr(mask, back);
+        offset = and(ptr_in, #7);
+}
+{
+        memd(sp+#8) = R25:24;           /*  save r25,r24 on stack  */
+        dalign = sub(ptr_out, ptr_in);
+        r31.h = #HI(.Lmemcpy_return);   /*  set up final return pointer  */
+}
+{
+        /*  see if there if input buffer end if aligned  */
+        over = add(len, ptr_in);
+        back = add(len, offset);
+        memd(sp+#16) = R21:20;          /*  save r20,r21 on stack  */
+}
+{
+        noprolog = bitsclr(prolog, #7);
+        prolog = and(prolog, #31);
+        dcfetch(ptr_in_p_128);
+        ptr_in_p_128 = add(ptr_in_p_128, #32);
+}
+{
+        kernel = sub(len, prolog);
+        shift = asl(prolog, #3);
+        star3 = and(prolog, #7);
+        ptr_in = and(ptr_in, #-8);
+}
+{
+        prolog = lsr(prolog, #3);
+        epilog = and(kernel, #31);
+        ptr_out_p_32 = add(ptr_out, prolog);
+        over = and(over, #7);
+}
+{
+        p3 = cmp.gtu(back, #8);
+        kernel = lsr(kernel, #5);
+        dcfetch(ptr_in_p_128);
+        ptr_in_p_128 = add(ptr_in_p_128, #32);
+}
+{
+        p1 = cmp.eq(prolog, #0);
+        if(!p1.new) prolog = add(prolog, #1);
+        dcfetch(ptr_in_p_128);  /*  reserve the line 64bytes on  */
+        ptr_in_p_128 = add(ptr_in_p_128, #32);
+}
+{
+        nokernel = cmp.eq(kernel,#0);
+        dcfetch(ptr_in_p_128);  /* reserve the line 64bytes on  */
+        ptr_in_p_128 = add(ptr_in_p_128, #32);
+        shiftb = and(shift, #8);
+}
+{
+        dcfetch(ptr_in_p_128);          /*  reserve the line 64bytes on  */
+        ptr_in_p_128 = add(ptr_in_p_128, #32);
+        if(nokernel) jump .Lskip64;
+        p2 = cmp.eq(kernel, #1);        /*  skip ovr if kernel == 0  */
+}
+{
+        dczeroa(ptr_out_p_32);
+        /*  don't advance pointer  */
+        if(!p2) ptr_out_p_32 = add(ptr_out_p_32, #32);
+}
+{
+        dalign = and(dalign, #31);
+        dczeroa(ptr_out_p_32);
+}
+.Lskip64:
+{
+        data70 = memd(ptr_in++#16);
+        if(p3) dataF8 = memd(ptr_in+#8);
+        if(noprolog) jump .Lnoprolog32;
+        align = offset;
+}
+/*  upto initial 7 bytes  */
+{
+        ldata0 = valignb(dataF8, data70, align);
+        ifbyte = tstbit(shift,#3);
+        offset = add(offset, star3);
+}
+{
+        if(ifbyte) memb(ptr_out++#1) = data0;
+        ldata0 = lsr(ldata0, shiftb);
+        shiftb = and(shift, #16);
+        ifhword = tstbit(shift,#4);
+}
+{
+        if(ifhword) memh(ptr_out++#2) = data0;
+        ldata0 = lsr(ldata0, shiftb);
+        ifword = tstbit(shift,#5);
+        p2 = cmp.gtu(offset, #7);
+}
+{
+        if(ifword) memw(ptr_out++#4) = data0;
+        if(p2) data70 = dataF8;
+        if(p2) dataF8 = memd(ptr_in++#8);       /*  another 8 bytes  */
+        align = offset;
+}
+.Lnoprolog32:
+{
+        p3 = sp1loop0(.Ldword_loop_prolog, prolog)
+        rest = sub(len, star3); /*  whats left after the loop  */
+        p0 = cmp.gt(over, #0);
+}
+        if(p0) rest = add(rest, #16);
+.Ldword_loop_prolog:
+{
+        if(p3) memd(ptr_out++#8) = ldata0;
+        ldata0 = valignb(dataF8, data70, align);
+        p0 = cmp.gt(rest, #16);
+}
+{
+        data70 = dataF8;
+        if(p0) dataF8 = memd(ptr_in++#8);
+        rest = add(rest, #-8);
+}:endloop0
+.Lkernel:
+{
+        /*  kernel is at least 32bytes  */
+        p3 = cmp.gtu(kernel, #0);
+        /*  last itn. remove edge effects  */
+        if(p3.new) kernel = add(kernel, #-1);
+        /*  dealt with in last dword loop  */
+        if(p3.new) epilog = add(epilog, #32);
+}
+{
+        nokernel = cmp.eq(kernel, #0);          /*  after adjustment, recheck */
+        if(nokernel.new) jump:NT .Lepilog;      /*  likely not taken  */
+        inc = combine(#32, #-1);
+        p3 = cmp.gtu(dalign, #24);
+}
+{
+        if(p3) jump .Lodd_alignment;
+}
+{
+        loop0(.Loword_loop_25to31, kernel);
+        kernel1 = cmp.gtu(kernel, #1);
+        rest = kernel;
+}
+        .falign
+.Loword_loop_25to31:
+{
+        dcfetch(ptr_in_p_128);  /*  prefetch 4 lines ahead  */
+        if(kernel1) ptr_out_p_32 = add(ptr_out_p_32, #32);
+}
+{
+        dczeroa(ptr_out_p_32);  /*  reserve the next 32bytes in cache  */
+        p3 = cmp.eq(kernel, rest);
+}
+{
+        /*  kernel -= 1  */
+        ptr_in_p_128kernel = vaddw(ptr_in_p_128kernel, inc);
+        /*  kill write on first iteration  */
+        if(!p3) memd(ptr_out++#8) = ldata1;
+        ldata1 = valignb(dataF8, data70, align);
+        data70 = memd(ptr_in++#8);
+}
+{
+        memd(ptr_out++#8) = ldata0;
+        ldata0 = valignb(data70, dataF8, align);
+        dataF8 = memd(ptr_in++#8);
+}
+{
+        memd(ptr_out++#8) = ldata1;
+        ldata1 = valignb(dataF8, data70, align);
+        data70 = memd(ptr_in++#8);
+}
+{
+        memd(ptr_out++#8) = ldata0;
+        ldata0 = valignb(data70, dataF8, align);
+        dataF8 = memd(ptr_in++#8);
+        kernel1 = cmp.gtu(kernel, #1);
+}:endloop0
+{
+        memd(ptr_out++#8) = ldata1;
+        jump .Lepilog;
+}
+.Lodd_alignment:
+{
+        loop0(.Loword_loop_00to24, kernel);
+        kernel1 = cmp.gtu(kernel, #1);
+        rest = add(kernel, #-1);
+}
+        .falign
+.Loword_loop_00to24:
+{
+        dcfetch(ptr_in_p_128);  /*  prefetch 4 lines ahead  */
+        ptr_in_p_128kernel = vaddw(ptr_in_p_128kernel, inc);
+        if(kernel1) ptr_out_p_32 = add(ptr_out_p_32, #32);
+}
+{
+        dczeroa(ptr_out_p_32);  /*  reserve the next 32bytes in cache  */
+}
+{
+        memd(ptr_out++#8) = ldata0;
+        ldata0 = valignb(dataF8, data70, align);
+        data70 = memd(ptr_in++#8);
+}
+{
+        memd(ptr_out++#8) = ldata0;
+        ldata0 = valignb(data70, dataF8, align);
+        dataF8 = memd(ptr_in++#8);
+}
+{
+        memd(ptr_out++#8) = ldata0;
+        ldata0 = valignb(dataF8, data70, align);
+        data70 = memd(ptr_in++#8);
+}
+{
+        memd(ptr_out++#8) = ldata0;
+        ldata0 = valignb(data70, dataF8, align);
+        dataF8 = memd(ptr_in++#8);
+        kernel1 = cmp.gtu(kernel, #1);
+}:endloop0
+.Lepilog:
+{
+        noepilog = cmp.eq(epilog,#0);
+        epilogdws = lsr(epilog, #3);
+        kernel = and(epilog, #7);
+}
+{
+        if(noepilog) jumpr r31;
+        if(noepilog) ptr_out = sub(ptr_out, len);
+        p3 = cmp.eq(epilogdws, #0);
+        shift2 = asl(epilog, #3);
+}
+{
+        shiftb = and(shift2, #32);
+        ifword = tstbit(epilog,#2);
+        if(p3) jump .Lepilog60;
+        if(!p3) epilog = add(epilog, #-16);
+}
+{
+        loop0(.Ldword_loop_epilog, epilogdws);
+        /*  stop criteria is lsbs unless = 0 then its 8  */
+        p3 = cmp.eq(kernel, #0);
+        if(p3.new) kernel= #8;
+        p1 = cmp.gt(over, #0);
+}
+        /*  if not aligned to end of buffer execute 1 more iteration  */
+        if(p1) kernel= #0;
+.Ldword_loop_epilog:
+{
+        memd(ptr_out++#8) = ldata0;
+        ldata0 = valignb(dataF8, data70, align);
+        p3 = cmp.gt(epilog, kernel);
+}
+{
+        data70 = dataF8;
+        if(p3) dataF8 = memd(ptr_in++#8);
+        epilog = add(epilog, #-8);
+}:endloop0
+/* copy last 7 bytes */
+.Lepilog60:
+{
+        if(ifword) memw(ptr_out++#4) = data0;
+        ldata0 = lsr(ldata0, shiftb);
+        ifhword = tstbit(epilog,#1);
+        shiftb = and(shift2, #16);
+}
+{
+        if(ifhword) memh(ptr_out++#2) = data0;
+        ldata0 = lsr(ldata0, shiftb);
+        ifbyte = tstbit(epilog,#0);
+        if(ifbyte.new) len = add(len, #-1);
+}
+{
+        if(ifbyte) memb(ptr_out) = data0;
+        ptr_out = sub(ptr_out, len);    /*  return dest pointer  */
+        jumpr r31;
+}
+/*  do byte copy for small n  */
+.Lbytes23orless:
+{
+        p3 = sp1loop0(.Lbyte_copy, len);
+        len = add(len, #-1);
+}
+.Lbyte_copy:
+{
+        data0 = memb(ptr_in++#1);
+        if(p3) memb(ptr_out++#1) = data0;
+}:endloop0
+{
+        memb(ptr_out) = data0;
+        ptr_out = sub(ptr_out, len);
+        jumpr r31;
+}
+/*  do dword copies for aligned in, out and length  */
+.Ldwordaligned:
+{
+        p3 = sp1loop0(.Ldword_copy, len8);
+}
+.Ldword_copy:
+{
+        if(p3) memd(ptr_out++#8) = ldata0;
+        ldata0 = memd(ptr_in++#8);
+}:endloop0
+{
+        memd(ptr_out) = ldata0;
+        ptr_out = sub(ptr_out, len);
+        jumpr r31;      /*  return to function caller  */
+}
+.Lmemcpy_return:
+        r21:20 = memd(sp+#16);  /*  restore r20+r21  */
+{
+        r25:24 = memd(sp+#8);   /*  restore r24+r25  */
+        r17:16 = memd(sp+#0);   /*  restore r16+r17  */
+}
+        deallocframe;   /*  restore r31 and incrment stack by 16  */
+        jumpr r31