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65 lines
1.8 KiB
65 lines
1.8 KiB
6 years ago
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#include "emulation.h"
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#ifndef __riscv_muldiv
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#if __riscv_xlen == 64
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typedef __int128 double_int;
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#else
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typedef int64_t double_int;
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#endif
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// These routines rely on the compiler to turn these operations into libcalls
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// when not natively supported. So work on making those go fast.
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DECLARE_EMULATION_FUNC(emulate_mul_div)
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{
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uintptr_t rs1 = GET_RS1(insn, regs), rs2 = GET_RS2(insn, regs), val;
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if ((insn & MASK_MUL) == MATCH_MUL)
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val = rs1 * rs2;
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else if ((insn & MASK_DIV) == MATCH_DIV)
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val = (intptr_t)rs1 / (intptr_t)rs2;
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else if ((insn & MASK_DIVU) == MATCH_DIVU)
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val = rs1 / rs2;
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else if ((insn & MASK_REM) == MATCH_REM)
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val = (intptr_t)rs1 % (intptr_t)rs2;
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else if ((insn & MASK_REMU) == MATCH_REMU)
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val = rs1 % rs2;
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else if ((insn & MASK_MULH) == MATCH_MULH)
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val = ((double_int)(intptr_t)rs1 * (double_int)(intptr_t)rs2) >> (8 * sizeof(rs1));
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else if ((insn & MASK_MULHU) == MATCH_MULHU)
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val = ((double_int)rs1 * (double_int)rs2) >> (8 * sizeof(rs1));
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else if ((insn & MASK_MULHSU) == MATCH_MULHSU)
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val = ((double_int)(intptr_t)rs1 * (double_int)rs2) >> (8 * sizeof(rs1));
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else
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return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
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SET_RD(insn, regs, val);
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}
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#if __riscv_xlen == 64
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DECLARE_EMULATION_FUNC(emulate_mul_div32)
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{
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uint32_t rs1 = GET_RS1(insn, regs), rs2 = GET_RS2(insn, regs);
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int32_t val;
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if ((insn & MASK_MULW) == MATCH_MULW)
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val = rs1 * rs2;
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else if ((insn & MASK_DIVW) == MATCH_DIVW)
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val = (int32_t)rs1 / (int32_t)rs2;
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else if ((insn & MASK_DIVUW) == MATCH_DIVUW)
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val = rs1 / rs2;
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else if ((insn & MASK_REMW) == MATCH_REMW)
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val = (int32_t)rs1 % (int32_t)rs2;
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else if ((insn & MASK_REMUW) == MATCH_REMUW)
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val = rs1 % rs2;
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else
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return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
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SET_RD(insn, regs, val);
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}
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#endif
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#endif
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