sraw
Shift right arithmetic word
This instruction is defined by:
-
I, version >= 0
This instruction is included in the following profiles:
-
RVA20S64 (Mandatory)
-
RVA20U64 (Mandatory)
-
RVA22S64 (Mandatory)
-
RVA22U64 (Mandatory)
Synopsis
This instruction must have data-independent timing when extension Zkt is enabled. |
Arithmetic shift the 32-bit value in rs1
right by the value in the lower 5 bits of rs2
, and store the sign-extended result in rd
.
Decode Variables
Bits<5> rs2 = $encoding[24:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];
Execution
-
IDL
-
Sail
{
let rs1_val = (X(rs1))[31..0];
let rs2_val = (X(rs2))[31..0];
let result : bits(32) = match op {
RISCV_ADDW => rs1_val + rs2_val,
RISCV_SUBW => rs1_val - rs2_val,
RISCV_SLLW => rs1_val << (rs2_val[4..0]),
RISCV_SRLW => rs1_val >> (rs2_val[4..0]),
RISCV_SRAW => shift_right_arith32(rs1_val, rs2_val[4..0])
};
X(rd) = sign_extend(result);
RETIRE_SUCCESS
}