jalr

Jump and link register

This instruction is defined by:

Encoding

svg

Synopsis

Jump to an address formed by adding xs1 to a signed offset then clearing the least significant bit, and store the return address in xd.

Access

M

HS

U

VS

VU

Always

Always

Always

Always

Always

Decode Variables

Bits<12> imm = $encoding[31:20];
Bits<5> xs1 = $encoding[19:15];
Bits<5> xd = $encoding[11:7];

Execution

  • Pruned, XLEN == 64

  • Original

XReg returnaddr;
returnaddr = $pc + 4;
%%LINK%func;jump;jump%%((X[xs1] + $signed(imm)) & ~MXLEN'1);
X[xd] = returnaddr;
XReg returnaddr;
returnaddr = $pc + 4;
%%LINK%func;jump;jump%%((X[xs1] + $signed(imm)) & ~MXLEN'1);
X[xd] = returnaddr;

Exceptions

This instruction may result in the following synchronous exceptions:

  • InstructionAddressMisaligned