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target/m68k: add fsglmul and fsgldiv

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fsglmul and fsgldiv truncate data to single precision before computing
results.

Backports commit 2f77995cebc8027851b8ea8f02c097fb8cdf668a from qemu
This commit is contained in:
Laurent Vivier 2018-03-03 20:59:16 -05:00 committed by Lioncash
parent 4e8e8572c3
commit 1d5e30f30c
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GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 36 additions and 0 deletions
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28
qemu/target/m68k/fpu_helper.c
View file

@ -264,6 +264,20 @@ void HELPER(fdmul)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
PREC_END();
}
void HELPER(fsglmul)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
int rounding_mode = get_float_rounding_mode(&env->fp_status);
floatx80 a, b;
PREC_BEGIN(32);
set_float_rounding_mode(float_round_to_zero, &env->fp_status);
a = floatx80_round(val0->d, &env->fp_status);
b = floatx80_round(val1->d, &env->fp_status);
set_float_rounding_mode(rounding_mode, &env->fp_status);
res->d = floatx80_mul(a, b, &env->fp_status);
PREC_END();
}
void HELPER(fdiv)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
res->d = floatx80_div(val1->d, val0->d, &env->fp_status);
@ -283,6 +297,20 @@ void HELPER(fddiv)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
PREC_END();
}
void HELPER(fsgldiv)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
int rounding_mode = get_float_rounding_mode(&env->fp_status);
floatx80 a, b;
PREC_BEGIN(32);
set_float_rounding_mode(float_round_to_zero, &env->fp_status);
a = floatx80_round(val1->d, &env->fp_status);
b = floatx80_round(val0->d, &env->fp_status);
set_float_rounding_mode(rounding_mode, &env->fp_status);
res->d = floatx80_div(a, b, &env->fp_status);
PREC_END();
}
static int float_comp_to_cc(int float_compare)
{
switch (float_compare) {

2
qemu/target/m68k/helper.h
View file

@ -41,9 +41,11 @@ DEF_HELPER_4(fdsub, void, env, fp, fp, fp)
DEF_HELPER_4(fmul, void, env, fp, fp, fp)
DEF_HELPER_4(fsmul, void, env, fp, fp, fp)
DEF_HELPER_4(fdmul, void, env, fp, fp, fp)
DEF_HELPER_4(fsglmul, void, env, fp, fp, fp)
DEF_HELPER_4(fdiv, void, env, fp, fp, fp)
DEF_HELPER_4(fsdiv, void, env, fp, fp, fp)
DEF_HELPER_4(fddiv, void, env, fp, fp, fp)
DEF_HELPER_4(fsgldiv, 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)

6
qemu/target/m68k/translate.c
View file

@ -4823,6 +4823,12 @@ DISAS_INSN(fpu)
case 0x67: /* fdmul */
gen_helper_fdmul(tcg_ctx, tcg_ctx->cpu_env, cpu_dest, cpu_src, cpu_dest);
break;
case 0x24: /* fsgldiv */
gen_helper_fsgldiv(tcg_ctx, tcg_ctx->cpu_env, cpu_dest, cpu_src, cpu_dest);
break;
case 0x27: /* fsglmul */
gen_helper_fsglmul(tcg_ctx, tcg_ctx->cpu_env, cpu_dest, cpu_src, cpu_dest);
break;
case 0x28: /* fsub */
gen_helper_fsub(tcg_ctx, tcg_ctx->cpu_env, cpu_dest, cpu_src, cpu_dest);
break;