What is the 32-bit operation?
It expands to xor rd', rd', rs2', writing back to rd'.
C.XOR
RISC-V C.XOR Instruction Details
Instruction ManualC-typeBitwise XOR of rd' and rs2', write to rd'. CA format.
Instruction Syntax
c.xor rd', rs2'
Operand Breakdown
RV32/RV64 C or Zca; 16-bit CA format, with no immediate.
Three-bit rd'/rs1' and rs2' both select x8-x15; rd' is read and written.
XOR the two XLEN-bit sources and write rd'.
Identical fields read the same old value, producing zero.
CCompressed Instruction
Extension condition: RV32/RV64; requires C or Zca.
Instruction Behavior
C.XOR (CA format, x8-x15 only) computes bitwise XOR of rd' and rs2', writes to rd'. Expands to xor rd',rd',rs2'.
C.XOR Decode & Execute Animation
Shows only official 16-bit fields, conditions, and architectural state; it does not model a pipeline, cache, or timing.
c.xor,
Execution context
RV32/RV64; requires C or Zca; overlapping operands read the same old value.
x10 <- 0x0000FFFF
16-bit encoding fields
15..10
funct6
100011
9..7
rd'/rs1'
010
6..5
funct2
01
4..2
rs2'
011
1..0
op
01
Execution data path
CA fields restore rd'/rs1' to x10 and rs2' to x11; both three-bit fields map to x8-x15.
0x0000FF0F XOR 0x000000F0 = 0x0000FFFF
x10 <- 0x0000FFFF
Architectural state has not been committed.
Quick Understanding & Search Notes
C.XOR XORs rd' with rs2' bit by bit and writes rd'. Both CA compact-register fields select only x8-x15.
The CA rd'/rs1' and rs2' fields are three bits each and map to x8-x15.
C.XOR is an XLEN-bit bitwise XOR with no immediate operand.
Common Usage Scenarios
Bitwise XOR
RV32/RV64 C/Zca, x8=0xff0f and x9=0xf0: c.xor x8, x9 yields x8=0xffff.
Pre-Use Checklist
Syntax Check
- RV32/RV64 C or Zca; 16-bit CA format, with no immediate.
- Three-bit rd'/rs1' and rs2' both select x8-x15; rd' is read and written.
Semantic Check
- XOR the two XLEN-bit sources and write rd'.
- Identical fields read the same old value, producing zero.
Pitfalls / Common Confusions
Only x8-x15 registers (CA format, 3-bit register fields)
There is no immediate operand; rd' is both the read left operand and the writeback destination
FAQ
Can both operands select one register?
Yes. They read the same old value, producing zero; both fields select only x8-x15.