/* U1memcpy.S: UltraSPARC-I/II/IIi/IIe optimized memcpy. * * Copyright (C) 1997, 2004 David S. Miller (davem@redhat.com) * Copyright (C) 1996, 1997, 1998, 1999 Jakub Jelinek (jj@ultra.linux.cz) */ #ifdef __KERNEL__ #include <asm/visasm.h> #include <asm/asi.h> #define GLOBAL_SPARE g7 #else #define GLOBAL_SPARE g5 #define ASI_BLK_P 0xf0 #define FPRS_FEF 0x04 #ifdef MEMCPY_DEBUG #define VISEntry rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs; \ clr %g1; clr %g2; clr %g3; subcc %g0, %g0, %g0; #define VISExit and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs #else #define VISEntry rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs #define VISExit and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs #endif #endif #ifndef EX_LD #define EX_LD(x) x #endif #ifndef EX_ST #define EX_ST(x) x #endif #ifndef EX_RETVAL #define EX_RETVAL(x) x #endif #ifndef LOAD #define LOAD(type,addr,dest) type [addr], dest #endif #ifndef LOAD_BLK #define LOAD_BLK(addr,dest) ldda [addr] ASI_BLK_P, dest #endif #ifndef STORE #define STORE(type,src,addr) type src, [addr] #endif #ifndef STORE_BLK #define STORE_BLK(src,addr) stda src, [addr] ASI_BLK_P #endif #ifndef FUNC_NAME #define FUNC_NAME memcpy #endif #ifndef PREAMBLE #define PREAMBLE #endif #ifndef XCC #define XCC xcc #endif #define FREG_FROB(f1, f2, f3, f4, f5, f6, f7, f8, f9) \ faligndata %f1, %f2, %f48; \ faligndata %f2, %f3, %f50; \ faligndata %f3, %f4, %f52; \ faligndata %f4, %f5, %f54; \ faligndata %f5, %f6, %f56; \ faligndata %f6, %f7, %f58; \ faligndata %f7, %f8, %f60; \ faligndata %f8, %f9, %f62; #define MAIN_LOOP_CHUNK(src, dest, fdest, fsrc, len, jmptgt) \ EX_LD(LOAD_BLK(%src, %fdest)); \ EX_ST(STORE_BLK(%fsrc, %dest)); \ add %src, 0x40, %src; \ subcc %len, 0x40, %len; \ be,pn %xcc, jmptgt; \ add %dest, 0x40, %dest; \ #define LOOP_CHUNK1(src, dest, len, branch_dest) \ MAIN_LOOP_CHUNK(src, dest, f0, f48, len, branch_dest) #define LOOP_CHUNK2(src, dest, len, branch_dest) \ MAIN_LOOP_CHUNK(src, dest, f16, f48, len, branch_dest) #define LOOP_CHUNK3(src, dest, len, branch_dest) \ MAIN_LOOP_CHUNK(src, dest, f32, f48, len, branch_dest) #define DO_SYNC membar #Sync; #define STORE_SYNC(dest, fsrc) \ EX_ST(STORE_BLK(%fsrc, %dest)); \ add %dest, 0x40, %dest; \ DO_SYNC #define STORE_JUMP(dest, fsrc, target) \ EX_ST(STORE_BLK(%fsrc, %dest)); \ add %dest, 0x40, %dest; \ ba,pt %xcc, target; \ nop; #define FINISH_VISCHUNK(dest, f0, f1, left) \ subcc %left, 8, %left;\ bl,pn %xcc, 95f; \ faligndata %f0, %f1, %f48; \ EX_ST(STORE(std, %f48, %dest)); \ add %dest, 8, %dest; #define UNEVEN_VISCHUNK_LAST(dest, f0, f1, left) \ subcc %left, 8, %left; \ bl,pn %xcc, 95f; \ fsrc1 %f0, %f1; #define UNEVEN_VISCHUNK(dest, f0, f1, left) \ UNEVEN_VISCHUNK_LAST(dest, f0, f1, left) \ ba,a,pt %xcc, 93f; .register %g2,#scratch .register %g3,#scratch .text .align 64 .globl FUNC_NAME .type FUNC_NAME,#function FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */ srlx %o2, 31, %g2 cmp %g2, 0 tne %xcc, 5 PREAMBLE mov %o0, %o4 cmp %o2, 0 be,pn %XCC, 85f or %o0, %o1, %o3 cmp %o2, 16 blu,a,pn %XCC, 80f or %o3, %o2, %o3 cmp %o2, (5 * 64) blu,pt %XCC, 70f andcc %o3, 0x7, %g0 /* Clobbers o5/g1/g2/g3/g7/icc/xcc. */ VISEntry /* Is 'dst' already aligned on an 64-byte boundary? */ andcc %o0, 0x3f, %g2 be,pt %XCC, 2f /* Compute abs((dst & 0x3f) - 0x40) into %g2. This is the number * of bytes to copy to make 'dst' 64-byte aligned. We pre- * subtract this from 'len'. */ sub %o0, %o1, %GLOBAL_SPARE sub %g2, 0x40, %g2 sub %g0, %g2, %g2 sub %o2, %g2, %o2 andcc %g2, 0x7, %g1 be,pt %icc, 2f and %g2, 0x38, %g2 1: subcc %g1, 0x1, %g1 EX_LD(LOAD(ldub, %o1 + 0x00, %o3)) EX_ST(STORE(stb, %o3, %o1 + %GLOBAL_SPARE)) bgu,pt %XCC, 1b add %o1, 0x1, %o1 add %o1, %GLOBAL_SPARE, %o0 2: cmp %g2, 0x0 and %o1, 0x7, %g1 be,pt %icc, 3f alignaddr %o1, %g0, %o1 EX_LD(LOAD(ldd, %o1, %f4)) 1: EX_LD(LOAD(ldd, %o1 + 0x8, %f6)) add %o1, 0x8, %o1 subcc %g2, 0x8, %g2 faligndata %f4, %f6, %f0 EX_ST(STORE(std, %f0, %o0)) be,pn %icc, 3f add %o0, 0x8, %o0 EX_LD(LOAD(ldd, %o1 + 0x8, %f4)) add %o1, 0x8, %o1 subcc %g2, 0x8, %g2 faligndata %f6, %f4, %f0 EX_ST(STORE(std, %f0, %o0)) bne,pt %icc, 1b add %o0, 0x8, %o0 /* Destination is 64-byte aligned. */ 3: membar #LoadStore | #StoreStore | #StoreLoad subcc %o2, 0x40, %GLOBAL_SPARE add %o1, %g1, %g1 andncc %GLOBAL_SPARE, (0x40 - 1), %GLOBAL_SPARE srl %g1, 3, %g2 sub %o2, %GLOBAL_SPARE, %g3 andn %o1, (0x40 - 1), %o1 and %g2, 7, %g2 andncc %g3, 0x7, %g3 fmovd %f0, %f2 sub %g3, 0x8, %g3 sub %o2, %GLOBAL_SPARE, %o2 add %g1, %GLOBAL_SPARE, %g1 subcc %o2, %g3, %o2 EX_LD(LOAD_BLK(%o1, %f0)) add %o1, 0x40, %o1 add %g1, %g3, %g1 EX_LD(LOAD_BLK(%o1, %f16)) add %o1, 0x40, %o1 sub %GLOBAL_SPARE, 0x80, %GLOBAL_SPARE EX_LD(LOAD_BLK(%o1, %f32)) add %o1, 0x40, %o1 /* There are 8 instances of the unrolled loop, * one for each possible alignment of the * source buffer. Each loop instance is 452 * bytes. */ sll %g2, 3, %o3 sub %o3, %g2, %o3 sllx %o3, 4, %o3 add %o3, %g2, %o3 sllx %o3, 2, %g2 1: rd %pc, %o3 add %o3, %lo(1f - 1b), %o3 jmpl %o3 + %g2, %g0 nop .align 64 1: FREG_FROB(f0, f2, f4, f6, f8, f10,f12,f14,f16) LOOP_CHUNK1(o1, o0, GLOBAL_SPARE, 1f) FREG_FROB(f16,f18,f20,f22,f24,f26,f28,f30,f32) LOOP_CHUNK2(o1, o0, GLOBAL_SPARE, 2f) FREG_FROB(f32,f34,f36,f38,f40,f42,f44,f46,f0) LOOP_CHUNK3(o1, o0, GLOBAL_SPARE, 3f) ba,pt %xcc, 1b+4 faligndata %f0, %f2, %f48 1: FREG_FROB(f16,f18,f20,f22,f24,f26,f28,f30,f32) STORE_SYNC(o0, f48) FREG_FROB(f32,f34,f36,f38,f40,f42,f44,f46,f0) STORE_JUMP(o0, f48, 40f) 2: FREG_FROB(f32,f34,f36,f38,f40,f42,f44,f46,f0) STORE_SYNC(o0, f48) FREG_FROB(f0, f2, f4, f6, f8, f10,f12,f14,f16) STORE_JUMP(o0, f48, 48f) 3: FREG_FROB(f0, f2, f4, f6, f8, f10,f12,f14,f16) STORE_SYNC(o0, f48) FREG_FROB(f16,f18,f20,f22,f24,f26,f28,f30,f32) STORE_JUMP(o0, f48, 56f) 1: FREG_FROB(f2, f4, f6, f8, f10,f12,f14,f16,f18) LOOP_CHUNK1(o1, o0, GLOBAL_SPARE, 1f) FREG_FROB(f18,f20,f22,f24,f26,f28,f30,f32,f34) LOOP_CHUNK2(o1, o0, GLOBAL_SPARE, 2f) FREG_FROB(f34,f36,f38,f40,f42,f44,f46,f0, f2) LOOP_CHUNK3(o1, o0, GLOBAL_SPARE, 3f) ba,pt %xcc, 1b+4 faligndata %f2, %f4, %f48 1: FREG_FROB(f18,f20,f22,f24,f26,f28,f30,f32,f34) STORE_SYNC(o0, f48) FREG_FROB(f34,f36,f38,f40,f42,f44,f46,f0, f2) STORE_JUMP(o0, f48, 41f) 2: FREG_FROB(f34,f36,f38,f40,f42,f44,f46,f0, f2) STORE_SYNC(o0, f48) FREG_FROB(f2, f4, f6, f8, f10,f12,f14,f16,f18) STORE_JUMP(o0, f48, 49f) 3: FREG_FROB(f2, f4, f6, f8, f10,f12,f14,f16,f18) STORE_SYNC(o0, f48) FREG_FROB(f18,f20,f22,f24,f26,f28,f30,f32,f34) STORE_JUMP(o0, f48, 57f) 1: FREG_FROB(f4, f6, f8, f10,f12,f14,f16,f18,f20) LOOP_CHUNK1(o1, o0, GLOBAL_SPARE, 1f) FREG_FROB(f20,f22,f24,f26,f28,f30,f32,f34,f36) LOOP_CHUNK2(o1, o0, GLOBAL_SPARE, 2f) FREG_FROB(f36,f38,f40,f42,f44,f46,f0, f2, f4) LOOP_CHUNK3(o1, o0, GLOBAL_SPARE, 3f) ba,pt %xcc, 1b+4 faligndata %f4, %f6, %f48 1: FREG_FROB(f20,f22,f24,f26,f28,f30,f32,f34,f36) STORE_SYNC(o0, f48) FREG_FROB(f36,f38,f40,f42,f44,f46,f0, f2, f4) STORE_JUMP(o0, f48, 42f) 2: FREG_FROB(f36,f38,f40,f42,f44,f46,f0, f2, f4) STORE_SYNC(o0, f48) FREG_FROB(f4, f6, f8, f10,f12,f14,f16,f18,f20) STORE_JUMP(o0, f48, 50f) 3: FREG_FROB(f4, f6, f8, f10,f12,f14,f16,f18,f20) STORE_SYNC(o0, f48) FREG_FROB(f20,f22,f24,f26,f28,f30,f32,f34,f36) STORE_JUMP(o0, f48, 58f) 1: FREG_FROB(f6, f8, f10,f12,f14,f16,f18,f20,f22) LOOP_CHUNK1(o1, o0, GLOBAL_SPARE, 1f) FREG_FROB(f22,f24,f26,f28,f30,f32,f34,f36,f38) LOOP_CHUNK2(o1, o0, GLOBAL_SPARE, 2f) FREG_FROB(f38,f40,f42,f44,f46,f0, f2, f4, f6) LOOP_CHUNK3(o1, o0, GLOBAL_SPARE, 3f) ba,pt %xcc, 1b+4 faligndata %f6, %f8, %f48 1: FREG_FROB(f22,f24,f26,f28,f30,f32,f34,f36,f38) STORE_SYNC(o0, f48) FREG_FROB(f38,f40,f42,f44,f46,f0, f2, f4, f6) STORE_JUMP(o0, f48, 43f) 2: FREG_FROB(f38,f40,f42,f44,f46,f0, f2, f4, f6) STORE_SYNC(o0, f48) FREG_FROB(f6, f8, f10,f12,f14,f16,f18,f20,f22) STORE_JUMP(o0, f48, 51f) 3: FREG_FROB(f6, f8, f10,f12,f14,f16,f18,f20,f22) STORE_SYNC(o0, f48) FREG_FROB(f22,f24,f26,f28,f30,f32,f34,f36,f38) STORE_JUMP(o0, f48, 59f) 1: FREG_FROB(f8, f10,f12,f14,f16,f18,f20,f22,f24) LOOP_CHUNK1(o1, o0, GLOBAL_SPARE, 1f) FREG_FROB(f24,f26,f28,f30,f32,f34,f36,f38,f40) LOOP_CHUNK2(o1, o0, GLOBAL_SPARE, 2f) FREG_FROB(f40,f42,f44,f46,f0, f2, f4, f6, f8) LOOP_CHUNK3(o1, o0, GLOBAL_SPARE, 3f) ba,pt %xcc, 1b+4 faligndata %f8, %f10, %f48 1: FREG_FROB(f24,f26,f28,f30,f32,f34,f36,f38,f40) STORE_SYNC(o0, f48) FREG_FROB(f40,f42,f44,f46,f0, f2, f4, f6, f8) STORE_JUMP(o0, f48, 44f) 2: FREG_FROB(f40,f42,f44,f46,f0, f2, f4, f6, f8) STORE_SYNC(o0, f48) FREG_FROB(f8, f10,f12,f14,f16,f18,f20,f22,f24) STORE_JUMP(o0, f48, 52f) 3: FREG_FROB(f8, f10,f12,f14,f16,f18,f20,f22,f24) STORE_SYNC(o0, f48) FREG_FROB(f24,f26,f28,f30,f32,f34,f36,f38,f40) STORE_JUMP(o0, f48, 60f) 1: FREG_FROB(f10,f12,f14,f16,f18,f20,f22,f24,f26) LOOP_CHUNK1(o1, o0, GLOBAL_SPARE, 1f) FREG_FROB(f26,f28,f30,f32,f34,f36,f38,f40,f42) LOOP_CHUNK2(o1, o0, GLOBAL_SPARE, 2f) FREG_FROB(f42,f44,f46,f0, f2, f4, f6, f8, f10) LOOP_CHUNK3(o1, o0, GLOBAL_SPARE, 3f) ba,pt %xcc, 1b+4 faligndata %f10, %f12, %f48 1: FREG_FROB(f26,f28,f30,f32,f34,f36,f38,f40,f42) STORE_SYNC(o0, f48) FREG_FROB(f42,f44,f46,f0, f2, f4, f6, f8, f10) STORE_JUMP(o0, f48, 45f) 2: FREG_FROB(f42,f44,f46,f0, f2, f4, f6, f8, f10) STORE_SYNC(o0, f48) FREG_FROB(f10,f12,f14,f16,f18,f20,f22,f24,f26) STORE_JUMP(o0, f48, 53f) 3: FREG_FROB(f10,f12,f14,f16,f18,f20,f22,f24,f26) STORE_SYNC(o0, f48) FREG_FROB(f26,f28,f30,f32,f34,f36,f38,f40,f42) STORE_JUMP(o0, f48, 61f) 1: FREG_FROB(f12,f14,f16,f18,f20,f22,f24,f26,f28) LOOP_CHUNK1(o1, o0, GLOBAL_SPARE, 1f) FREG_FROB(f28,f30,f32,f34,f36,f38,f40,f42,f44) LOOP_CHUNK2(o1, o0, GLOBAL_SPARE, 2f) FREG_FROB(f44,f46,f0, f2, f4, f6, f8, f10,f12) LOOP_CHUNK3(o1, o0, GLOBAL_SPARE, 3f) ba,pt %xcc, 1b+4 faligndata %f12, %f14, %f48 1: FREG_FROB(f28,f30,f32,f34,f36,f38,f40,f42,f44) STORE_SYNC(o0, f48) FREG_FROB(f44,f46,f0, f2, f4, f6, f8, f10,f12) STORE_JUMP(o0, f48, 46f) 2: FREG_FROB(f44,f46,f0, f2, f4, f6, f8, f10,f12) STORE_SYNC(o0, f48) FREG_FROB(f12,f14,f16,f18,f20,f22,f24,f26,f28) STORE_JUMP(o0, f48, 54f) 3: FREG_FROB(f12,f14,f16,f18,f20,f22,f24,f26,f28) STORE_SYNC(o0, f48) FREG_FROB(f28,f30,f32,f34,f36,f38,f40,f42,f44) STORE_JUMP(o0, f48, 62f) 1: FREG_FROB(f14,f16,f18,f20,f22,f24,f26,f28,f30) LOOP_CHUNK1(o1, o0, GLOBAL_SPARE, 1f) FREG_FROB(f30,f32,f34,f36,f38,f40,f42,f44,f46) LOOP_CHUNK2(o1, o0, GLOBAL_SPARE, 2f) FREG_FROB(f46,f0, f2, f4, f6, f8, f10,f12,f14) LOOP_CHUNK3(o1, o0, GLOBAL_SPARE, 3f) ba,pt %xcc, 1b+4 faligndata %f14, %f16, %f48 1: FREG_FROB(f30,f32,f34,f36,f38,f40,f42,f44,f46) STORE_SYNC(o0, f48) FREG_FROB(f46,f0, f2, f4, f6, f8, f10,f12,f14) STORE_JUMP(o0, f48, 47f) 2: FREG_FROB(f46,f0, f2, f4, f6, f8, f10,f12,f14) STORE_SYNC(o0, f48) FREG_FROB(f14,f16,f18,f20,f22,f24,f26,f28,f30) STORE_JUMP(o0, f48, 55f) 3: FREG_FROB(f14,f16,f18,f20,f22,f24,f26,f28,f30) STORE_SYNC(o0, f48) FREG_FROB(f30,f32,f34,f36,f38,f40,f42,f44,f46) STORE_JUMP(o0, f48, 63f) 40: FINISH_VISCHUNK(o0, f0, f2, g3) 41: FINISH_VISCHUNK(o0, f2, f4, g3) 42: FINISH_VISCHUNK(o0, f4, f6, g3) 43: FINISH_VISCHUNK(o0, f6, f8, g3) 44: FINISH_VISCHUNK(o0, f8, f10, g3) 45: FINISH_VISCHUNK(o0, f10, f12, g3) 46: FINISH_VISCHUNK(o0, f12, f14, g3) 47: UNEVEN_VISCHUNK(o0, f14, f0, g3) 48: FINISH_VISCHUNK(o0, f16, f18, g3) 49: FINISH_VISCHUNK(o0, f18, f20, g3) 50: FINISH_VISCHUNK(o0, f20, f22, g3) 51: FINISH_VISCHUNK(o0, f22, f24, g3) 52: FINISH_VISCHUNK(o0, f24, f26, g3) 53: FINISH_VISCHUNK(o0, f26, f28, g3) 54: FINISH_VISCHUNK(o0, f28, f30, g3) 55: UNEVEN_VISCHUNK(o0, f30, f0, g3) 56: FINISH_VISCHUNK(o0, f32, f34, g3) 57: FINISH_VISCHUNK(o0, f34, f36, g3) 58: FINISH_VISCHUNK(o0, f36, f38, g3) 59: FINISH_VISCHUNK(o0, f38, f40, g3) 60: FINISH_VISCHUNK(o0, f40, f42, g3) 61: FINISH_VISCHUNK(o0, f42, f44, g3) 62: FINISH_VISCHUNK(o0, f44, f46, g3) 63: UNEVEN_VISCHUNK_LAST(o0, f46, f0, g3) 93: EX_LD(LOAD(ldd, %o1, %f2)) add %o1, 8, %o1 subcc %g3, 8, %g3 faligndata %f0, %f2, %f8 EX_ST(STORE(std, %f8, %o0)) bl,pn %xcc, 95f add %o0, 8, %o0 EX_LD(LOAD(ldd, %o1, %f0)) add %o1, 8, %o1 subcc %g3, 8, %g3 faligndata %f2, %f0, %f8 EX_ST(STORE(std, %f8, %o0)) bge,pt %xcc, 93b add %o0, 8, %o0 95: brz,pt %o2, 2f mov %g1, %o1 1: EX_LD(LOAD(ldub, %o1, %o3)) add %o1, 1, %o1 subcc %o2, 1, %o2 EX_ST(STORE(stb, %o3, %o0)) bne,pt %xcc, 1b add %o0, 1, %o0 2: membar #StoreLoad | #StoreStore VISExit retl mov EX_RETVAL(%o4), %o0 .align 64 70: /* 16 < len <= (5 * 64) */ bne,pn %XCC, 75f sub %o0, %o1, %o3 72: andn %o2, 0xf, %GLOBAL_SPARE and %o2, 0xf, %o2 1: EX_LD(LOAD(ldx, %o1 + 0x00, %o5)) EX_LD(LOAD(ldx, %o1 + 0x08, %g1)) subcc %GLOBAL_SPARE, 0x10, %GLOBAL_SPARE EX_ST(STORE(stx, %o5, %o1 + %o3)) add %o1, 0x8, %o1 EX_ST(STORE(stx, %g1, %o1 + %o3)) bgu,pt %XCC, 1b add %o1, 0x8, %o1 73: andcc %o2, 0x8, %g0 be,pt %XCC, 1f nop EX_LD(LOAD(ldx, %o1, %o5)) sub %o2, 0x8, %o2 EX_ST(STORE(stx, %o5, %o1 + %o3)) add %o1, 0x8, %o1 1: andcc %o2, 0x4, %g0 be,pt %XCC, 1f nop EX_LD(LOAD(lduw, %o1, %o5)) sub %o2, 0x4, %o2 EX_ST(STORE(stw, %o5, %o1 + %o3)) add %o1, 0x4, %o1 1: cmp %o2, 0 be,pt %XCC, 85f nop ba,pt %xcc, 90f nop 75: andcc %o0, 0x7, %g1 sub %g1, 0x8, %g1 be,pn %icc, 2f sub %g0, %g1, %g1 sub %o2, %g1, %o2 1: EX_LD(LOAD(ldub, %o1, %o5)) subcc %g1, 1, %g1 EX_ST(STORE(stb, %o5, %o1 + %o3)) bgu,pt %icc, 1b add %o1, 1, %o1 2: add %o1, %o3, %o0 andcc %o1, 0x7, %g1 bne,pt %icc, 8f sll %g1, 3, %g1 cmp %o2, 16 bgeu,pt %icc, 72b nop ba,a,pt %xcc, 73b 8: mov 64, %o3 andn %o1, 0x7, %o1 EX_LD(LOAD(ldx, %o1, %g2)) sub %o3, %g1, %o3 andn %o2, 0x7, %GLOBAL_SPARE sllx %g2, %g1, %g2 1: EX_LD(LOAD(ldx, %o1 + 0x8, %g3)) subcc %GLOBAL_SPARE, 0x8, %GLOBAL_SPARE add %o1, 0x8, %o1 srlx %g3, %o3, %o5 or %o5, %g2, %o5 EX_ST(STORE(stx, %o5, %o0)) add %o0, 0x8, %o0 bgu,pt %icc, 1b sllx %g3, %g1, %g2 srl %g1, 3, %g1 andcc %o2, 0x7, %o2 be,pn %icc, 85f add %o1, %g1, %o1 ba,pt %xcc, 90f sub %o0, %o1, %o3 .align 64 80: /* 0 < len <= 16 */ andcc %o3, 0x3, %g0 bne,pn %XCC, 90f sub %o0, %o1, %o3 1: EX_LD(LOAD(lduw, %o1, %g1)) subcc %o2, 4, %o2 EX_ST(STORE(stw, %g1, %o1 + %o3)) bgu,pt %XCC, 1b add %o1, 4, %o1 85: retl mov EX_RETVAL(%o4), %o0 .align 32 90: EX_LD(LOAD(ldub, %o1, %g1)) subcc %o2, 1, %o2 EX_ST(STORE(stb, %g1, %o1 + %o3)) bgu,pt %XCC, 90b add %o1, 1, %o1 retl mov EX_RETVAL(%o4), %o0 .size FUNC_NAME, .-FUNC_NAME