Commit 9d403660 authored by Laurent Vivier's avatar Laurent Vivier
Browse files

target/m68k: add fmovecr 



fmovecr moves a floating point constant from the
FPU ROM to a floating point register.

Signed-off-by: default avatarLaurent Vivier <laurent@vivier.eu>
Reviewed-by: default avatarRichard Henderson <rth@twiddle.net>
Reviewed-by: default avatarPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20170628204241.32106-3-laurent@vivier.eu>
parent dd337bf8

target/m68k/fpu_helper.c

+34 −0
Original line number Diff line number Diff line
@@ -23,6 +23,35 @@ 
#include "exec/helper-proto.h"

#include "exec/exec-all.h"



/* Undefined offsets may be different on various FPU.

 * On 68040 they return 0.0 (floatx80_zero)

 */



static const floatx80 fpu_rom[128] = {

    [0x00] = floatx80_pi,                                   /* Pi */

    [0x0b] = make_floatx80(0x3ffd, 0x9a209a84fbcff798ULL),  /* Log10(2) */

    [0x0c] = make_floatx80(0x4000, 0xadf85458a2bb4a9aULL),  /* e        */

    [0x0d] = make_floatx80(0x3fff, 0xb8aa3b295c17f0bcULL),  /* Log2(e)  */

    [0x0e] = make_floatx80(0x3ffd, 0xde5bd8a937287195ULL),  /* Log10(e) */

    [0x0f] = floatx80_zero,                                 /* Zero     */

    [0x30] = floatx80_ln2,                                  /* ln(2)    */

    [0x31] = make_floatx80(0x4000, 0x935d8dddaaa8ac17ULL),  /* ln(10)   */

    [0x32] = floatx80_one,                                  /* 10^0     */

    [0x33] = make_floatx80(0x4002, 0xa000000000000000ULL),  /* 10^1     */

    [0x34] = make_floatx80(0x4005, 0xc800000000000000ULL),  /* 10^2     */

    [0x35] = make_floatx80(0x400c, 0x9c40000000000000ULL),  /* 10^4     */

    [0x36] = make_floatx80(0x4019, 0xbebc200000000000ULL),  /* 10^8     */

    [0x37] = make_floatx80(0x4034, 0x8e1bc9bf04000000ULL),  /* 10^16    */

    [0x38] = make_floatx80(0x4069, 0x9dc5ada82b70b59eULL),  /* 10^32    */

    [0x39] = make_floatx80(0x40d3, 0xc2781f49ffcfa6d5ULL),  /* 10^64    */

    [0x3a] = make_floatx80(0x41a8, 0x93ba47c980e98ce0ULL),  /* 10^128   */

    [0x3b] = make_floatx80(0x4351, 0xaa7eebfb9df9de8eULL),  /* 10^256   */

    [0x3c] = make_floatx80(0x46a3, 0xe319a0aea60e91c7ULL),  /* 10^512   */

    [0x3d] = make_floatx80(0x4d48, 0xc976758681750c17ULL),  /* 10^1024  */

    [0x3e] = make_floatx80(0x5a92, 0x9e8b3b5dc53d5de5ULL),  /* 10^2048  */

    [0x3f] = make_floatx80(0x7525, 0xc46052028a20979bULL),  /* 10^4096  */

};



int32_t HELPER(reds32)(CPUM68KState *env, FPReg *val)

{

    return floatx80_to_int32(val->d, &env->fp_status);
@@ -204,3 +233,8 @@ void HELPER(ftst)(CPUM68KState *env, FPReg *val) 
    }

    env->fpsr = (env->fpsr & ~FPSR_CC_MASK) | cc;

}



void HELPER(fconst)(CPUM68KState *env, FPReg *val, uint32_t offset)

{

    val->d = fpu_rom[offset];

}

target/m68k/helper.h

+1 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ DEF_HELPER_4(fdiv, void, env, fp, fp, fp) 
DEF_HELPER_FLAGS_3(fcmp, TCG_CALL_NO_RWG, void, env, fp, fp)

DEF_HELPER_FLAGS_2(set_fpcr, TCG_CALL_NO_RWG, void, env, i32)

DEF_HELPER_FLAGS_2(ftst, TCG_CALL_NO_RWG, void, env, fp)

DEF_HELPER_3(fconst, void, env, fp, i32)



DEF_HELPER_3(mac_move, void, env, i32, i32)

DEF_HELPER_3(macmulf, i64, env, i32, i32)

target/m68k/translate.c

+12 −1
Original line number Diff line number Diff line
@@ -4518,10 +4518,21 @@ DISAS_INSN(fpu) 
    ext = read_im16(env, s);

    opmode = ext & 0x7f;

    switch ((ext >> 13) & 7) {

    case 0: case 2:

    case 0:

        break;

    case 1:

        goto undef;

    case 2:

        if (insn == 0xf200 && (ext & 0xfc00) == 0x5c00) {

            /* fmovecr */

            TCGv rom_offset = tcg_const_i32(opmode);

            cpu_dest = gen_fp_ptr(REG(ext, 7));

            gen_helper_fconst(cpu_env, cpu_dest, rom_offset);

            tcg_temp_free_ptr(cpu_dest);

            tcg_temp_free(rom_offset);

            return;

        }

        break;

    case 3: /* fmove out */

        cpu_src = gen_fp_ptr(REG(ext, 7));

        opsize = ext_opsize(ext, 10);