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PROGRAMMING EXAMPLES
II
MATRIX MULTIPLY, C = A
*
8, CACHED LOADS ONLY
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Registers loaded by calling routine
A=r16
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pointer into A, stored in memory by rows
8=r17
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pointer into 8, stored in memory by columns
C=r18
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pointer into C, stored in memory by rows
L=r19
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the number of rows in A
M=r20
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the number of columns in A and rows in 8
N=r21
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the number of columns in 8
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Registers used locally
RC=r28
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rowlcolumn counter decremented by bla for loop control
DEC=r27
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decrementor for rowlcolumn pointers
Ar=r26
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counter of rows in A
8c=r25
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counter of columns in 8
8p=r24
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temporary pointer into 8
SIZ=r23
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number of bytes in row of A or column of 8
A1=f4; A2=f5; A3=f6; A4=f7; A5=f8; A6=f9; A7=f10;A8=f11
81=f12;82=f13;83=f14;84=f15;85=f16;86=f17;87=f18;88=f19
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matrix A row values
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matrx 8 column vals
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temporary results
T1=f20;T2=f21;T3=f22
shl
2,
adds
-8,
adds
-8,
adds
-4,
d.fiadd.dd
f0,
adds
-1,
d.fnop
M,
r0,
M,
C,
f0,
L,
SIZ
DEC
RC
C
f0
Ar
bla
d.fnop
subs
start_row::
d.pfmul.ss
mov
d.pfmul.ss
adds
d.pfmul.ss
fld.q
d.pfadd.ss
fld.q
d.pfadd.ss
adds
d.pfadd.ss
fld.q
DEC, RC, start_row
A,
SIZ, A
f0,
f0,
8,
8p
f0,
f0,
SIZ, A,
f0,
f0,
16(8p) ,
f0,
f0,
16 (A) ,
f0,
f0,
-1,
N,
f0,
f0,
0(A),
f0
f0
A
f0
85
f0
A5
f0
8c
f0
A1
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Number of bytes in M entries
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Set decrementor for bla
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Initialize rowlcolumn counter
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Start C index one entry low
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Initiate dual-instruction mode
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Make row counter zero relative
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First dual-mode pair
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Initialize LCC
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Start pointer to A one row low
Executed once per row of A
Point to first col of 8
Point to next row of A
Load
entries of 8
Load
entries of A
Initialize column counter
Load 4 entries of A
Example 9-13. Matiix Multiply, Cached Loads Only (Sheet 1 of 2)
9-16
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