This commit is contained in:
cinap_lenrek 2015-11-01 12:14:00 +01:00
commit 2ba46903fa
5 changed files with 62 additions and 3 deletions

View file

@ -306,6 +306,7 @@ subprop(Reg *r0)
case AAND:
case AEOR:
case AMUL:
case AMULU:
case ADIV:
case ADIVU:
@ -977,6 +978,7 @@ copyu(Prog *p, Adr *v, Adr *s)
case AAND:
case AEOR:
case AMUL:
case AMULU:
case ADIV:
case ADIVU:
case AADDF:
@ -1112,6 +1114,7 @@ a2type(Prog *p)
case AAND:
case AEOR:
case AMUL:
case AMULU:
case ADIV:
case ADIVU:
return D_REG;

View file

@ -2,12 +2,14 @@ objtype=arm
</$objtype/mkfile
LIB=/$objtype/lib/libmp.a
OFILES= \
SFILES=mpvecdigmuladd.s mpvecdigmulsub.s
HFILES=/$objtype/include/u.h /sys/include/mp.h ../port/dat.h
UPDATE=\
mkfile\
OFILES=${SFILES:%.s=%.$O}
UPDATE=mkfile\
$HFILES\
$SFILES\
</sys/src/cmd/mksyslib

View file

@ -0,0 +1,19 @@
TEXT mpvecdigmuladd(SB),$0
MOVW n+4(FP),R4
MOVW m+8(FP),R5
MOVW p+12(FP),R6
MOVW $0, R2
_muladdloop:
MOVW $0, R1
MOVW.W.P 4(R0), R3
MULALU R3, R5, (R1, R2)
MOVW (R6), R7
ADD.S R2, R7
ADC $0, R1, R2
MOVW.W.P R7, 4(R6)
SUB.S $1, R4
B.NE _muladdloop
MOVW (R6), R7
ADD R2, R7
MOVW R7, (R6)
RET

View file

@ -0,0 +1,22 @@
TEXT mpvecdigmulsub(SB),$0
MOVW n+4(FP),R4
MOVW m+8(FP),R5
MOVW p+12(FP),R6
MOVW $0, R2
_mulsubloop:
MOVW $0, R1
MOVW.W.P 4(R0), R3
MULALU R3, R5, (R1, R2)
MOVW (R6), R7
SUB.S R2, R7
ADD.CC $1, R1
MOVW R1, R2
MOVW.W.P R7, 4(R6)
SUB.S $1, R4
B.NE _mulsubloop
MOVW (R6), R7
SUB.S R2, R7
MOVW.CS $1, R0
MOVW.CC $-1, R0
MOVW R7, (R6)
RET

View file

@ -21,6 +21,19 @@ mpdigdiv(mpdigit *dividend, mpdigit divisor, mpdigit *quotient)
return;
}
// very common case
if(~divisor == 0){
lo += hi;
if(lo < hi){
hi++;
lo++;
}
if(lo+1 == 0)
hi++;
*quotient = hi;
return;
}
// at this point we know that hi < divisor
// just shift and subtract till we're done
q = 0;