diff options
Diffstat (limited to 'sysdeps/m68k/sub_n.S')
| -rw-r--r-- | sysdeps/m68k/sub_n.S | 75 |
1 files changed, 39 insertions, 36 deletions
diff --git a/sysdeps/m68k/sub_n.S b/sysdeps/m68k/sub_n.S index 19f0ec1568..39f5161176 100644 --- a/sysdeps/m68k/sub_n.S +++ b/sysdeps/m68k/sub_n.S @@ -1,7 +1,7 @@ /* mc68020 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and store difference in a third limb vector. -Copyright (C) 1992, 1994 Free Software Foundation, Inc. +Copyright (C) 1992, 1994, 1996 Free Software Foundation, Inc. This file is part of the GNU MP Library. @@ -27,50 +27,53 @@ the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ size (sp + 12) */ +#include "sysdep.h" #include "asm-syntax.h" TEXT ALIGN - GLOBL ___mpn_sub_n + GLOBL C_SYMBOL_NAME(__mpn_sub_n) -LAB(___mpn_sub_n) +C_SYMBOL_NAME(__mpn_sub_n:) +PROLOG(__mpn_sub_n) /* Save used registers on the stack. */ - INSN2(move,l ,MEM_PREDEC(sp),d2) - INSN2(move,l ,MEM_PREDEC(sp),a2) + movel R(d2),MEM_PREDEC(sp) + movel R(a2),MEM_PREDEC(sp) /* Copy the arguments to registers. Better use movem? */ - INSN2(move,l ,a2,MEM_DISP(sp,12)) - INSN2(move,l ,a0,MEM_DISP(sp,16)) - INSN2(move,l ,a1,MEM_DISP(sp,20)) - INSN2(move,l ,d2,MEM_DISP(sp,24)) - - INSN2(eor,w ,d2,#1) - INSN2(lsr,l ,d2,#1) - bcc L1 - INSN2(subq,l ,d2,#1) /* clears cy as side effect */ - -LAB(Loop) - INSN2(move,l ,d0,MEM_POSTINC(a0)) - INSN2(move,l ,d1,MEM_POSTINC(a1)) - INSN2(subx,l ,d0,d1) - INSN2(move,l ,MEM_POSTINC(a2),d0) -LAB(L1) INSN2(move,l ,d0,MEM_POSTINC(a0)) - INSN2(move,l ,d1,MEM_POSTINC(a1)) - INSN2(subx,l ,d0,d1) - INSN2(move,l ,MEM_POSTINC(a2),d0) - - dbf d2,Loop /* loop until 16 lsb of %4 == -1 */ - INSN2(subx,l ,d0,d0) /* d0 <= -cy; save cy as 0 or -1 in d0 */ - INSN2(sub,l ,d2,#0x10000) - bcs L2 - INSN2(add,l ,d0,d0) /* restore cy */ - bra Loop - -LAB(L2) - INSN1(neg,l ,d0) + movel MEM_DISP(sp,12),R(a2) + movel MEM_DISP(sp,16),R(a0) + movel MEM_DISP(sp,20),R(a1) + movel MEM_DISP(sp,24),R(d2) + + eorw #1,R(d2) + lsrl #1,R(d2) + bcc L(L1) + subql #1,R(d2) /* clears cy as side effect */ + +L(Loop:) + movel MEM_POSTINC(a0),R(d0) + movel MEM_POSTINC(a1),R(d1) + subxl R(d1),R(d0) + movel R(d0),MEM_POSTINC(a2) +L(L1:) movel MEM_POSTINC(a0),R(d0) + movel MEM_POSTINC(a1),R(d1) + subxl R(d1),R(d0) + movel R(d0),MEM_POSTINC(a2) + + dbf R(d2),L(Loop) /* loop until 16 lsb of %4 == -1 */ + subxl R(d0),R(d0) /* d0 <= -cy; save cy as 0 or -1 in d0 */ + subl #0x10000,R(d2) + bcs L(L2) + addl R(d0),R(d0) /* restore cy */ + bra L(Loop) + +L(L2:) + negl R(d0) /* Restore used registers from stack frame. */ - INSN2(move,l ,a2,MEM_POSTINC(sp)) - INSN2(move,l ,d2,MEM_POSTINC(sp)) + movel MEM_POSTINC(sp),R(a2) + movel MEM_POSTINC(sp),R(d2) rts +EPILOG(__mpn_sub_n) |