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Diffstat (limited to 'sysdeps/alpha/ldiv.S')
| -rw-r--r-- | sysdeps/alpha/ldiv.S | 218 |
1 files changed, 0 insertions, 218 deletions
diff --git a/sysdeps/alpha/ldiv.S b/sysdeps/alpha/ldiv.S deleted file mode 100644 index 0a971a7ed0..0000000000 --- a/sysdeps/alpha/ldiv.S +++ /dev/null @@ -1,218 +0,0 @@ -/* Copyright (C) 1996, 1997, 2001, 2004 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Richard Henderson <rth@tamu.edu>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#include "div_libc.h" - -#undef FRAME -#ifdef __alpha_fix__ -#define FRAME 0 -#else -#define FRAME 16 -#endif - -#undef X -#undef Y -#define X $17 -#define Y $18 - - .set noat - - .align 4 - .globl ldiv - .ent ldiv -ldiv: - .frame sp, FRAME, ra -#if FRAME > 0 - lda sp, -FRAME(sp) -#endif -#ifdef PROF - .set macro - ldgp gp, 0(pv) - lda AT, _mcount - jsr AT, (AT), _mcount - .set nomacro - .prologue 1 -#else - .prologue 0 -#endif - - beq Y, $divbyzero - excb - mf_fpcr $f10 - - _ITOFT2 X, $f0, 0, Y, $f1, 8 - - .align 4 - cvtqt $f0, $f0 - cvtqt $f1, $f1 - divt/c $f0, $f1, $f0 - unop - - /* Check to see if X fit in the double as an exact value. */ - sll X, (64-53), AT - sra AT, (64-53), AT - cmpeq X, AT, AT - beq AT, $x_big - - /* If we get here, we're expecting exact results from the division. - Do nothing else besides convert and clean up. */ - cvttq/c $f0, $f0 - excb - mt_fpcr $f10 - _FTOIT $f0, $0, 0 - -$egress: - mulq $0, Y, $1 - subq X, $1, $1 - - stq $0, 0($16) - stq $1, 8($16) - mov $16, $0 - -#if FRAME > 0 - lda sp, FRAME(sp) -#endif - ret - - .align 4 -$x_big: - /* If we get here, X is large enough that we don't expect exact - results, and neither X nor Y got mis-translated for the fp - division. Our task is to take the fp result, figure out how - far it's off from the correct result and compute a fixup. */ - -#define Q v0 /* quotient */ -#define R t0 /* remainder */ -#define SY t1 /* scaled Y */ -#define S t2 /* scalar */ -#define QY t3 /* Q*Y */ - - /* The fixup code below can only handle unsigned values. */ - or X, Y, AT - mov $31, t5 - blt AT, $fix_sign_in -$fix_sign_in_ret1: - cvttq/c $f0, $f0 - - _FTOIT $f0, Q, 8 -$fix_sign_in_ret2: - mulq Q, Y, QY - excb - mt_fpcr $f10 - - .align 4 - subq QY, X, R - mov Y, SY - mov 1, S - bgt R, $q_high - -$q_high_ret: - subq X, QY, R - mov Y, SY - mov 1, S - bgt R, $q_low - -$q_low_ret: - negq Q, t4 - cmovlbs t5, t4, Q - br $egress - - .align 4 - /* The quotient that we computed was too large. We need to reduce - it by S such that Y*S >= R. Obviously the closer we get to the - correct value the better, but overshooting high is ok, as we'll - fix that up later. */ -0: - addq SY, SY, SY - addq S, S, S -$q_high: - cmpult SY, R, AT - bne AT, 0b - - subq Q, S, Q - unop - subq QY, SY, QY - br $q_high_ret - - .align 4 - /* The quotient that we computed was too small. Divide Y by the - current remainder (R) and add that to the existing quotient (Q). - The expectation, of course, is that R is much smaller than X. */ - /* Begin with a shift-up loop. Compute S such that Y*S >= R. We - already have a copy of Y in SY and the value 1 in S. */ -0: - addq SY, SY, SY - addq S, S, S -$q_low: - cmpult SY, R, AT - bne AT, 0b - - /* Shift-down and subtract loop. Each iteration compares our scaled - Y (SY) with the remainder (R); if SY <= R then X is divisible by - Y's scalar (S) so add it to the quotient (Q). */ -2: addq Q, S, t3 - srl S, 1, S - cmpule SY, R, AT - subq R, SY, t4 - - cmovne AT, t3, Q - cmovne AT, t4, R - srl SY, 1, SY - bne S, 2b - - br $q_low_ret - - .align 4 -$fix_sign_in: - /* If we got here, then X|Y is negative. Need to adjust everything - such that we're doing unsigned division in the fixup loop. */ - /* T5 is true if result should be negative. */ - xor X, Y, AT - cmplt AT, 0, t5 - cmplt X, 0, AT - negq X, t0 - - cmovne AT, t0, X - cmplt Y, 0, AT - negq Y, t0 - - cmovne AT, t0, Y - blbc t5, $fix_sign_in_ret1 - - cvttq/c $f0, $f0 - _FTOIT $f0, Q, 8 - .align 3 - negq Q, Q - br $fix_sign_in_ret2 - -$divbyzero: - mov a0, v0 - lda a0, GEN_INTDIV - call_pal PAL_gentrap - stq zero, 0(v0) - stq zero, 8(v0) - -#if FRAME > 0 - lda sp, FRAME(sp) -#endif - ret - - .end ldiv - -weak_alias (ldiv, lldiv) |