| /* |
| * Copyright (c) 2010-2011, The Linux Foundation. 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 |
| * occurring 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 |
