PNX1300 Philips, PNX1300 Datasheet - Page 500
PNX1300
Manufacturer Part Number
PNX1300
Description
Media Processors
Manufacturer
Philips
Datasheet
1.PNX1300.pdf
(548 pages)
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Philips Semiconductors
Unsigned multiply
SYNTAX
FUNCTION
DESCRIPTION
full 64-bit product into rdest. The operands are considered unsigned integers. No overflow or underflow detection is
performed.
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
r60 = 0x100
r10 = 0, r60 = 0x100, r30 = 0xf11
r20 = 1, r60 = 0x100, r30 = 0xf11
r70 = 0x100, r40 = 0xffffff9c
As shown below, the
The
[ IF rguard ] umul rsrc1 rsrc2
if rguard then
rsrc1
temp
rdest
64-bit result
31
umul
Initial Values
zero_ext32to64(rsrc1)
temp<31:0>
63
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
umul
unsigned
operation computes the product rsrc1 rsrc2 and writes the least-significant 32 bits of the
rdest
zero_ext32to64(rsrc2)
umul r60 r60
IF r10 umul r60 r30
IF r20 umul r60 r30
umul r70 r40
31
rdest
0
Operation
unsigned
unsigned
r80
r100
31
PRELIMINARY SPECIFICATION
rsrc2
31
r50
r90
PNX1300/01/02/11 DSPCPU Operations
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r80
no change, since guard is false
r90
r100
imul imulm umulm dspimul
unsigned
dspumul dspidualmul
0x10000
0xf1100
quadumulmsb fmul
0xffff9c00
ATTRIBUTES
SEE ALSO
Result
0
umul
ifmul
138
2, 3
No
—
0
2
3
A-202
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