Espressif ESP32-S2 Programming Manual page 1497

Chapter 4. API Guides
Description The instruction makes jump to the specified address. Jump can be either unconditional or based on an
ALU flag.
Examples:
1: JUMP
32-bit words)
→
2: JUMP
result is zero
→
3: JUMP
...
label: nop
4: .global
MOVE
JUMP
...
label: nop
JUMPR –Jump to a relative offset (condition based on R0)
Syntax JUMPR Step, Threshold, Condition
Operands
• Step –relative shift from current position, in bytes
• Threshold –threshold value for branch condition
• Condition:
– EQ (equal) –jump if value in R0 == threshold
– LT (less than) –jump if value in R0 < threshold
– LE (less or equal) –jump if value in R0 <= threshold
– GT (greater than) –jump if value in R0 > threshold
– GE (greater or equal) –jump if value in R0 >= threshold
Cycles Conditions EQ, GT and LT: 2 cycles to execute, 2 cycles to fetch next instruction
Conditions LE and GE are implemented in the assembler using two JUMPR instructions:
// JUMPR target, threshold, LE
JUMPR target, threshold, EQ
JUMPR target, threshold, LT
// JUMPR target, threshold, GE
JUMPR target, threshold, EQ
JUMPR target, threshold, GT
Therefore the execution time will depend on the branches taken: either 2 cycles to execute + 2 cycles to fetch,
or 4 cycles to execute + 4 cycles to fetch.
Description The instruction makes a jump to a relative address if condition is true. Condition is the result of
comparison of R0 register value and the threshold value.
Examples:
1:pos: JUMPR
value in R0 >= 20
→
2: // Down counting loop using R0 register
MOVE
label: SUB
Espressif Systems
R1 // Jump to address
0x120, EQ // Jump to address
label // Jump to label
// Definition of label
label // Declaration of
R1, label // R1
R1 // Jump to label
// Definition of label
is implemented as:
is implemented as:
16, 20, GE // Jump to address (position
R0, 16 // load
R0, R0, 1 // R0--
1486
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in R1 (address
0x120 (in
global label
= label (value loaded into R1
16 into R0
in R1 is in␣
bytes) if ALU␣
is in words)
+ 16 bytes) if␣
(continues on next page)
Release v4.4