Commit e90a99fe authored by Richard Henderson's avatar Richard Henderson Committed by Peter Maydell
Browse files

target/arm: Split out vfp_expand_imm 



Signed-off-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Reviewed-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Message-id: 20180110063337.21538-2-richard.henderson@linaro.org
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parent ecd219f7

target/arm/translate-a64.c

+28 −16
Original line number Diff line number Diff line
@@ -4985,6 +4985,33 @@ static void disas_fp_3src(DisasContext *s, uint32_t insn) 
    }

}



/* The imm8 encodes the sign bit, enough bits to represent an exponent in

 * the range 01....1xx to 10....0xx, and the most significant 4 bits of

 * the mantissa; see VFPExpandImm() in the v8 ARM ARM.

 */

static uint64_t vfp_expand_imm(int size, uint8_t imm8)

{

    uint64_t imm;



    switch (size) {

    case MO_64:

        imm = (extract32(imm8, 7, 1) ? 0x8000 : 0) |

            (extract32(imm8, 6, 1) ? 0x3fc0 : 0x4000) |

            extract32(imm8, 0, 6);

        imm <<= 48;

        break;

    case MO_32:

        imm = (extract32(imm8, 7, 1) ? 0x8000 : 0) |

            (extract32(imm8, 6, 1) ? 0x3e00 : 0x4000) |

            (extract32(imm8, 0, 6) << 3);

        imm <<= 16;

        break;

    default:

        g_assert_not_reached();

    }

    return imm;

}



/* Floating point immediate

 *   31  30  29 28       24 23  22  21 20        13 12   10 9    5 4    0

 * +---+---+---+-----------+------+---+------------+-------+------+------+
@@ -5008,22 +5035,7 @@ static void disas_fp_imm(DisasContext *s, uint32_t insn) 
        return;

    }



    /* The imm8 encodes the sign bit, enough bits to represent

     * an exponent in the range 01....1xx to 10....0xx,

     * and the most significant 4 bits of the mantissa; see

     * VFPExpandImm() in the v8 ARM ARM.

     */

    if (is_double) {

        imm = (extract32(imm8, 7, 1) ? 0x8000 : 0) |

            (extract32(imm8, 6, 1) ? 0x3fc0 : 0x4000) |

            extract32(imm8, 0, 6);

        imm <<= 48;

    } else {

        imm = (extract32(imm8, 7, 1) ? 0x8000 : 0) |

            (extract32(imm8, 6, 1) ? 0x3e00 : 0x4000) |

            (extract32(imm8, 0, 6) << 3);

        imm <<= 16;

    }

    imm = vfp_expand_imm(MO_32 + is_double, imm8);



    tcg_res = tcg_const_i64(imm);

    write_fp_dreg(s, rd, tcg_res);