diff options
Diffstat (limited to 'rtl/core/decode/snd.sv')
| -rw-r--r-- | rtl/core/decode/snd.sv | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/rtl/core/decode/snd.sv b/rtl/core/decode/snd.sv index 5110d57..4dbb028 100644 --- a/rtl/core/decode/snd.sv +++ b/rtl/core/decode/snd.sv @@ -5,6 +5,7 @@ module core_decode_snd ( input word insn, input logic is_imm, + ror_if_imm, shift_by_reg_if_reg, output snd_decode decode, @@ -13,7 +14,7 @@ module core_decode_snd reg_num r, r_shift; logic shift_by_reg, shl, shr, ror, put_carry, sign_extend; - logic[7:0] imm; + logic[11:0] imm; logic[5:0] shift_imm; assign decode.r = r; @@ -30,7 +31,7 @@ module core_decode_snd assign r = insn `FIELD_SND_RM; assign r_shift = insn `FIELD_SND_RS; - assign imm = insn `FIELD_SND_IMM8; + assign imm = ror_if_imm ? {4'b0, insn `FIELD_SND_IMM8} : insn `FIELD_SND_IMM12; assign shift_by_reg = ~is_imm & shift_by_reg_if_reg; assign undefined = shift_by_reg & insn `FIELD_SND_ZEROIFREG; @@ -43,7 +44,9 @@ module core_decode_snd put_carry = 0; sign_extend = 1'bx; - if(is_imm) + if(is_imm && !ror_if_imm) + shift_imm = 6'b0; + else if(is_imm && !ror_if_imm) shift_imm = {1'b0, insn `FIELD_SND_ROR8, 1'b0}; else begin shift_imm = {1'b0, insn `FIELD_SND_SHIFTIMM}; |