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Individual Instruction Descriptions
4-165Assembly Language Instructions
4.14.69 SHLAPL Shift Left with Accumulate
Syntax
[label] name dest, src [, mod] Clock, clk Word, w With RPT, clk Class
SHLAPL An, {adrs} Table 4–46 Table 4–46 1b
SHLAPL An[~], An[~] [, next A] 1 1 n
R
+3 3
Execution [premodify AP if mod specified]
PH, PL ⇐ src << SV
dest ⇐ dest + PL
PC ⇐ PC + 1
Flags Affected OF, SF, ZF, CF are set accordingly
src is {adrs}: TAG bit is set accordingly
Opcode
Instructions 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SHLAPL An, {adrs}
0 1 1 1 1 0 0 An adrs
x dma16 (for direct) or offset16 (long relative) [see section 4.13]
SHLAPL An[~], An[~] [, next A] 1 1 1 0 0 next A An 1 1 1 0 1 0 A~ ~A
Description Premodify the accumulator pointer if specified. Shift accumulator word or data memory
word pointed by {adrs} to left n
SV
bits (as specified by the SV register) into a 32-bit
result. This result is zero-filled on the right and either zero-filled or sign-extended on
the left (based on the setting of the extended sign mode (XM) bit in the status register).
The upper 16 bits are latched into the product high (PH) register. The lower 16 bits of
the result [product low (PL) register] is added to the destination accumulator (or its
offset). This instruction propagates the shifted bits to the next accumulator.
Syntax Description
SHLAPL An, {adrs} Shift data memory word left, add PL to An
SHLAPL An[~], An[~] [, next A] Shift An[~] left, add PL to An[~]
See Also SHLAPLS, SHLTPL , SHLTPLS, SHLSPL, SHLSPLS
Example 4.14.69.1 SHLAPL A0, *R4++R5
Shift the word pointed by the byte address stored in R4 by n
SV
bits to the left, add the shifted value (PL)
with accumulator A0, store the result in accumulator A0. Add R5 to R4 and store result in R4. PH holds
the upper 16 bits of the shift.
Example 4.14.69.2 SHLAPL A2, *R1++
Shift the word pointed by the byte address stored in R1 by n
SV
bits to the left, add the shifted value (PL)
with the accumulator (A2), and store the result in accumulator A2. Increment R1 (by 2) . PH holds the
upper 16 bits of the shift.
Example 4.14.69.3 SHLAPL A1, A1, ++A
Preincrement accumulator pointer AP1. Shift the accumulator A1 by n
SV
bits to the left, add the shifted
value (PL) to the accumulator and store the result in accumulator (A1). After execution PH contains the
upper 16 bits of the 32-bit shift.