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lib1funcs.asm (modnorm): New function(s).

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* lib1funcs.asm (modnorm): New function(s).  Like divnorm,
        but gets the sign bit right for modulo operations.
        (__modhi3, modsi3): Use modnorm.

From-SVN: r11701
This commit is contained in:
Jeff Law 1996-04-11 14:10:57 -06:00
parent cea60f06c0
commit 2570cc939a
1 changed files with 70 additions and 2 deletions
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72
gcc/config/h8300/lib1funcs.asm
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@ -190,6 +190,22 @@ _lab1: or A1H,A1H ; look at dividend
adds #1,A1
xor #0x1,A2L; and toggle sign of result
_lab2: rts
;; Basically the same, except that the sign of the divisor determines
;; the sign.
modnorm:
mov.b #0x0,A2L
or A0H,A0H ; is divisor > 0
bge _lab7
not A0H ; no - then make it +ve
not A0L
adds #1,A0
xor #0x1,A2L ; and remember that in A2L
_lab7: or A1H,A1H ; look at dividend
bge _lab8
not A1H ; it is -ve, make it positive
not A1L
adds #1,A1
_lab8: rts
; A0=A0/A1 signed
@ -208,7 +224,7 @@ _lab4: rts
.global ___modhi3
___modhi3:
bsr divnorm
bsr modnorm
bsr ___udivhi3
mov A3,A0
bra negans
@ -338,6 +354,39 @@ postive:
postive2:
rts
;; Basically the same, except that the sign of the divisor determines
;; the sign.
modnorm:
mov.b #0,S2L ; keep the sign in S2
mov.b A0H,A0H ; is the numerator -ve
bge mpostive
; negate arg
not A0H
not A1H
not A0L
not A1L
add #1,A1L
addx #0,A1H
addx #0,A0H
addx #0,A0L
mov.b #1,S2L ; the sign will be -ve
mpostive:
mov.b A2H,A2H ; is the denominator -ve
bge mpostive2
not A2L
not A2H
not A3L
not A3H
add.b #1,A3L
addx #0,A3H
addx #0,A2L
addx #0,A2H
mpostive2:
rts
#else /* __H8300H__ */
divnorm:
@ -358,6 +407,25 @@ postive:
postive2:
rts
;; Basically the same, except that the sign of the divisor determines
;; the sign.
modnorm:
mov.b #0,S2L ; keep the sign in S2
mov.l A0P,A0P ; is the numerator -ve
bge mpostive
neg.l A0P ; negate arg
mov.b #1,S2L ; the sign will be -ve
mpostive:
mov.l A1P,A1P ; is the denominator -ve
bge mpostive2
neg.l A1P ; negate arg
mpostive2:
rts
#endif
; numerator in A0/A1
@ -368,7 +436,7 @@ ___modsi3:
PUSHP S0P
PUSHP S1P
bsr divnorm
bsr modnorm
bsr divmodsi4
#ifdef __H8300__
mov S0,A0