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authorLaurent Vivier <laurent@vivier.eu>2018-03-12 21:27:25 +0100
committerLaurent Vivier <laurent@vivier.eu>2018-03-13 16:34:42 +0100
commite3655afa137b2e0999537eef273a2845ba21d68c (patch)
treecabf56fb6e2be1530f9f7f0290219f2013b943fd /target/m68k
parentc84813b807fc82c68ff6d72387f95b15ad283bf6 (diff)
target/m68k: implement fatanh
Using a local m68k floatx80_atanh() [copied from previous: Written by Andreas Grabher for Previous, NeXT Computer Emulator.] Signed-off-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20180312202728.23790-9-laurent@vivier.eu>
Diffstat (limited to 'target/m68k')
-rw-r--r--target/m68k/fpu_helper.c5
-rw-r--r--target/m68k/helper.h1
-rw-r--r--target/m68k/softfloat.c65
-rw-r--r--target/m68k/softfloat.h1
-rw-r--r--target/m68k/translate.c3
5 files changed, 75 insertions, 0 deletions
diff --git a/target/m68k/fpu_helper.c b/target/m68k/fpu_helper.c
index 18ad6999cb..38b663e1d2 100644
--- a/target/m68k/fpu_helper.c
+++ b/target/m68k/fpu_helper.c
@@ -633,3 +633,8 @@ void HELPER(facos)(CPUM68KState *env, FPReg *res, FPReg *val)
{
res->d = floatx80_acos(val->d, &env->fp_status);
}
+
+void HELPER(fatanh)(CPUM68KState *env, FPReg *res, FPReg *val)
+{
+ res->d = floatx80_atanh(val->d, &env->fp_status);
+}
diff --git a/target/m68k/helper.h b/target/m68k/helper.h
index 83247a8143..092baec3d5 100644
--- a/target/m68k/helper.h
+++ b/target/m68k/helper.h
@@ -82,6 +82,7 @@ DEF_HELPER_4(fsincos, void, env, fp, fp, fp)
DEF_HELPER_3(fatan, void, env, fp, fp)
DEF_HELPER_3(fasin, void, env, fp, fp)
DEF_HELPER_3(facos, void, env, fp, fp)
+DEF_HELPER_3(fatanh, void, env, fp, fp)
DEF_HELPER_3(mac_move, void, env, i32, i32)
DEF_HELPER_3(macmulf, i64, env, i32, i32)
diff --git a/target/m68k/softfloat.c b/target/m68k/softfloat.c
index 3d66f6946f..5ce8413e96 100644
--- a/target/m68k/softfloat.c
+++ b/target/m68k/softfloat.c
@@ -2302,3 +2302,68 @@ floatx80 floatx80_acos(floatx80 a, float_status *status)
return a;
}
+
+/*----------------------------------------------------------------------------
+ | Hyperbolic arc tangent
+ *----------------------------------------------------------------------------*/
+
+floatx80 floatx80_atanh(floatx80 a, float_status *status)
+{
+ flag aSign;
+ int32_t aExp;
+ uint64_t aSig;
+
+ int8_t user_rnd_mode, user_rnd_prec;
+
+ int32_t compact;
+ floatx80 fp0, fp1, fp2, one;
+
+ aSig = extractFloatx80Frac(a);
+ aExp = extractFloatx80Exp(a);
+ aSign = extractFloatx80Sign(a);
+
+ if (aExp == 0x7FFF && (uint64_t) (aSig << 1)) {
+ return propagateFloatx80NaNOneArg(a, status);
+ }
+
+ if (aExp == 0 && aSig == 0) {
+ return packFloatx80(aSign, 0, 0);
+ }
+
+ compact = floatx80_make_compact(aExp, aSig);
+
+ if (compact >= 0x3FFF8000) { /* |X| >= 1 */
+ if (aExp == one_exp && aSig == one_sig) { /* |X| == 1 */
+ float_raise(float_flag_divbyzero, status);
+ return packFloatx80(aSign, floatx80_infinity.high,
+ floatx80_infinity.low);
+ } else { /* |X| > 1 */
+ float_raise(float_flag_invalid, status);
+ return floatx80_default_nan(status);
+ }
+ } /* |X| < 1 */
+
+ user_rnd_mode = status->float_rounding_mode;
+ user_rnd_prec = status->floatx80_rounding_precision;
+ status->float_rounding_mode = float_round_nearest_even;
+ status->floatx80_rounding_precision = 80;
+
+ one = packFloatx80(0, one_exp, one_sig);
+ fp2 = packFloatx80(aSign, 0x3FFE, one_sig); /* SIGN(X) * (1/2) */
+ fp0 = packFloatx80(0, aExp, aSig); /* Y = |X| */
+ fp1 = packFloatx80(1, aExp, aSig); /* -Y */
+ fp0 = floatx80_add(fp0, fp0, status); /* 2Y */
+ fp1 = floatx80_add(fp1, one, status); /* 1-Y */
+ fp0 = floatx80_div(fp0, fp1, status); /* Z = 2Y/(1-Y) */
+ fp0 = floatx80_lognp1(fp0, status); /* LOG1P(Z) */
+
+ status->float_rounding_mode = user_rnd_mode;
+ status->floatx80_rounding_precision = user_rnd_prec;
+
+ a = floatx80_mul(fp0, fp2,
+ status); /* ATANH(X) = SIGN(X) * (1/2) * LOG1P(Z) */
+
+ float_raise(float_flag_inexact, status);
+
+ return a;
+}
diff --git a/target/m68k/softfloat.h b/target/m68k/softfloat.h
index 1140491c81..e9943aed20 100644
--- a/target/m68k/softfloat.h
+++ b/target/m68k/softfloat.h
@@ -40,4 +40,5 @@ floatx80 floatx80_cos(floatx80 a, float_status *status);
floatx80 floatx80_atan(floatx80 a, float_status *status);
floatx80 floatx80_asin(floatx80 a, float_status *status);
floatx80 floatx80_acos(floatx80 a, float_status *status);
+floatx80 floatx80_atanh(floatx80 a, float_status *status);
#endif
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index 5fad76c785..2f7caa0ca0 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -5063,6 +5063,9 @@ DISAS_INSN(fpu)
case 0x0c: /* fasin */
gen_helper_fasin(cpu_env, cpu_dest, cpu_src);
break;
+ case 0x0d: /* fatanh */
+ gen_helper_fatanh(cpu_env, cpu_dest, cpu_src);
+ break;
case 0x0e: /* fsin */
gen_helper_fsin(cpu_env, cpu_dest, cpu_src);
break;