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/*=======================================================================================*/
/* This Sail RISC-V architecture model, comprising all files and */
/* directories except where otherwise noted is subject the BSD */
/* two-clause license in the LICENSE file. */
/* */
/* SPDX-License-Identifier: BSD-2-Clause */
/*=======================================================================================*/
/* ****************************************************************** */
/* This file enables handling (ignoring) various hint instructions */
/* that are not already implicitly handled. */
/* ****************************************************************** */
union clause ast = C_NOP_HINT : (bits(6))
mapping clause encdec_compressed = C_NOP_HINT(im5 @ im40)
if im5 @ im40 != 0b000000
<-> 0b000 @ im5 : bits(1) @ 0b00000 @ im40 : bits(5) @ 0b01
if im5 @ im40 != 0b000000
function clause execute C_NOP_HINT(imm) = RETIRE_SUCCESS
mapping clause assembly = C_NOP_HINT(imm) <-> "c.nop.hint." ^ hex_bits_6(imm)
/* ****************************************************************** */
union clause ast = C_ADDI_HINT : (regidx)
mapping clause encdec_compressed = C_ADDI_HINT(rsd)
if rsd != zreg
<-> 0b000 @ 0b0 @ rsd : regidx @ 0b00000 @ 0b01
if rsd != zreg
function clause execute (C_ADDI_HINT(rsd)) = RETIRE_SUCCESS
mapping clause assembly = C_ADDI_HINT(rsd)
if rsd != zreg
<-> "c.addi.hint." ^ reg_name(rsd)
if rsd != zreg
/* ****************************************************************** */
union clause ast = C_LI_HINT : (bits(6))
mapping clause encdec_compressed = C_LI_HINT(imm5 @ imm40)
<-> 0b010 @ imm5 : bits(1) @ 0b00000 @ imm40 : bits(5) @ 0b01
function clause execute (C_LI_HINT(imm)) = RETIRE_SUCCESS
mapping clause assembly = C_LI_HINT(imm)
<-> "c.li.hint." ^ hex_bits_6(imm)
/* ****************************************************************** */
union clause ast = C_LUI_HINT : (bits(6))
mapping clause encdec_compressed = C_LUI_HINT(imm17 @ imm1612)
if imm17 @ imm1612 != 0b000000
<-> 0b011 @ imm17 : bits(1) @ 0b00000 @ imm1612 : bits(5) @ 0b01
if imm17 @ imm1612 != 0b000000
function clause execute (C_LUI_HINT(imm)) = RETIRE_SUCCESS
mapping clause assembly = C_LUI_HINT(imm)
if imm != 0b000000
<-> "c.lui.hint." ^ hex_bits_6(imm)
if imm != 0b000000
/* ****************************************************************** */
union clause ast = C_MV_HINT : (regidx)
mapping clause encdec_compressed = C_MV_HINT(rs2)
if rs2 != zreg
<-> 0b100 @ 0b0 @ 0b00000 @ rs2 : regidx @ 0b10
if rs2 != zreg
function clause execute (C_MV_HINT(rs2)) = RETIRE_SUCCESS
mapping clause assembly = C_MV_HINT(rs2)
if rs2 != zreg
<-> "c.mv.hint." ^ reg_name(rs2)
if rs2 != zreg
/* ****************************************************************** */
union clause ast = C_ADD_HINT : (regidx)
mapping clause encdec_compressed = C_ADD_HINT(rs2)
if rs2 != zreg
<-> 0b100 @ 0b1 @ 0b00000 @ rs2 : regidx @ 0b10
if rs2 != zreg
function clause execute (C_ADD_HINT(rs2)) = RETIRE_SUCCESS
mapping clause assembly = C_ADD_HINT(rs2)
if rs2 != zreg
<-> "c.add.hint." ^ reg_name(rs2)
if rs2 != zreg
/* ****************************************************************** */
union clause ast = C_SLLI_HINT : (bits(6), regidx)
mapping clause encdec_compressed = C_SLLI_HINT(nzui5 @ nzui40, rsd)
if (nzui5 @ nzui40 == 0b000000 | rsd == zreg) & (sizeof(xlen) == 64 | nzui5 == 0b0)
<-> 0b000 @ nzui5 : bits(1) @ rsd : regidx @ nzui40 : bits(5) @ 0b10
if (nzui5 @ nzui40 == 0b000000 | rsd == zreg) & (sizeof(xlen) == 64 | nzui5 == 0b0)
function clause execute (C_SLLI_HINT(shamt, rsd)) = RETIRE_SUCCESS
mapping clause assembly = C_SLLI_HINT(shamt, rsd)
if shamt == 0b000000 | rsd == zreg
<-> "c.slli.hint." ^ reg_name(rsd) ^ "." ^ hex_bits_6(shamt)
if shamt == 0b000000 | rsd == zreg
/* ****************************************************************** */
union clause ast = C_SRLI_HINT : (cregidx)
mapping clause encdec_compressed = C_SRLI_HINT(rsd)
<-> 0b100 @ 0b0 @ 0b00 @ rsd : cregidx @ 0b00000 @ 0b01
function clause execute (C_SRLI_HINT(rsd)) = RETIRE_SUCCESS
mapping clause assembly = C_SRLI_HINT(rsd)
<-> "c.srli.hint." ^ creg_name(rsd)
/* ****************************************************************** */
union clause ast = C_SRAI_HINT : (cregidx)
mapping clause encdec_compressed = C_SRAI_HINT(rsd)
<-> 0b100 @ 0b0 @ 0b01 @ rsd : cregidx @ 0b00000 @ 0b01
function clause execute (C_SRAI_HINT(rsd)) = RETIRE_SUCCESS
mapping clause assembly = C_SRAI_HINT(rsd)
<-> "c.srai.hint." ^ creg_name(rsd)
/* ****************************************************************** */
/* The reserved fences are not really hints, but for now they
* are in this file to be also treated as nops to avoid trapping.
*/
union clause ast = FENCE_RESERVED : (bits(4), bits(4), bits(4), regidx, regidx)
mapping clause encdec = FENCE_RESERVED(fm, pred, succ, rs, rd)
if (fm != 0b0000 & fm != 0b1000) | rs != 0b00000 | rd != 0b00000
<-> fm : bits(4) @ pred : bits(4) @ succ : bits(4) @ rs : regidx @ 0b000 @ rd : regidx @ 0b0001111
if (fm != 0b0000 & fm != 0b1000) | rs != 0b00000 | rd != 0b00000
function clause execute (FENCE_RESERVED(fm, pred, succ, rs, rd)) = RETIRE_SUCCESS
mapping clause assembly = FENCE_RESERVED(fm, pred, succ, rs, rd)
if (fm != 0b0000 & fm != 0b1000) | rs != 0b00000 | rd != 0b00000
<-> "fence.reserved." ^ fence_bits(pred) ^ "." ^ fence_bits(succ) ^ "."
^ reg_name(rs) ^ "." ^ reg_name(rd) ^ "." ^ hex_bits_4(fm)
if (fm != 0b0000 & fm != 0b1000) | rs != 0b00000 | rd != 0b00000
/* ****************************************************************** */
union clause ast = FENCEI_RESERVED : (bits(12), regidx, regidx)
mapping clause encdec = FENCEI_RESERVED(imm, rs, rd)
if imm != 0b000000000000 | rs != zreg | rd != zreg
<-> imm : bits(12) @ rs : regidx @ 0b001 @ rd : regidx @ 0b0001111
if imm != 0b000000000000 | rs != zreg | rd != zreg
function clause execute FENCEI_RESERVED(imm, rs, rd) = RETIRE_SUCCESS
mapping clause assembly = FENCEI_RESERVED(imm, rs, rd)
if imm != 0b000000000000 | rs != zreg | rd != zreg
<-> "fence.i.reserved." ^ reg_name(rd) ^ "." ^ reg_name(rs) ^ "." ^ hex_bits_12(imm)
if imm != 0b000000000000 | rs != zreg | rd != zreg
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