Rev. 1.50, 10/04, page 310 of 448
10.1.62 SHAL
(Shift
Arithmetic Left): Shift Instruction
Format
Operation
Instruction Code
Cycle
T Bit
SHAL Rn
T
←
Rn
←
0
0100nnnn00100000
1 MSB
Description:
This instruction arithmetically shifts the contents of general register Rn one bit to the left, and
stores the result in Rn. The bit shifted out of the operand is transferred to the T bit.
MSB
LSB
SHAL
T
0
Notes:
None
Operation:
SHAL(long n) /* SHAL Rn (Same as SHLL) */
{
if ((R[n]&0x80000000)==0) T = 0;
else T = 1;
R[n] <<= 1;
PC += 2;
}
Example:
SHAL
R0
;
Before execution R0 = H'80000001, T = 0
;
After execution
R0 = H'00000002, T = 1
Содержание SuperH SH-4A
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