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S3C2440A RISC MICROPROCESSOR THUMB INSTRUCTION SET
4-35
Table 4-17. The Conditional Branch Instructions (Continued)
L THUMB assembler ARM equivalent Description
1001 BLS label BLS label Branch if C clear or Z set (unsigned lower or
same)
1010 BGE label BGE label Branch if N set and V set, or N clear and V
clear (greater or equal)
1011 BLT label BLT label Branch if N set and V clear, or N clear and V
set (less than)
1100 BGT label BGT label Branch if Z clear, and either N set and V set
or N clear and V clear (greater than)
1101 BLE label BLE label Branch if Z set, or N set and V clear, or N
clear and V set (less than or equal)
NOTES
1. While label specifies a full 9-bit two's complement address, this must always be halfword-aligned (ie with bit 0 set to 0)
since the assembler actually places label >> 1 in field SOffset8.
2. Cond = 1110 is undefined, and should not be used.
Cond = 1111 creates the SWI instruction: see.
INSTRUCTION CYCLE TIMES
All instructions in this format have an equivalent ARM instruction as shown in Table 3-1. The instruction cycle
times for the THUMB instruction are identical to that of the equivalent ARM instruction.
EXAMPLES
CMP R0, #45 ; Branch to over-if R0 > 45.
BGT over ; Note that the THUMB opcode will contain the
number of halfwords to offset.
over ; Must be halfword aligned.