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authorLaurent Vivier <laurent@vivier.eu>2018-03-12 21:27:24 +0100
committerLaurent Vivier <laurent@vivier.eu>2018-03-13 16:34:33 +0100
commitc84813b807fc82c68ff6d72387f95b15ad283bf6 (patch)
treec04a7261e317037c0f9bee3f796c49f71134d57b /target/m68k
parentbc20b34e03b51725d7f008551b5f56f1da07ab6a (diff)
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target/m68k: implement facos
Using a local m68k floatx80_acos() [copied from previous: Written by Andreas Grabher for Previous, NeXT Computer Emulator.] Signed-off-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20180312202728.23790-8-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.c70
-rw-r--r--target/m68k/softfloat.h1
-rw-r--r--target/m68k/translate.c3
5 files changed, 80 insertions, 0 deletions
diff --git a/target/m68k/fpu_helper.c b/target/m68k/fpu_helper.c
index 972cc97..18ad699 100644
--- a/target/m68k/fpu_helper.c
+++ b/target/m68k/fpu_helper.c
@@ -628,3 +628,8 @@ void HELPER(fasin)(CPUM68KState *env, FPReg *res, FPReg *val)
{
res->d = floatx80_asin(val->d, &env->fp_status);
}
+
+void HELPER(facos)(CPUM68KState *env, FPReg *res, FPReg *val)
+{
+ res->d = floatx80_acos(val->d, &env->fp_status);
+}
diff --git a/target/m68k/helper.h b/target/m68k/helper.h
index e1aca37..83247a8 100644
--- a/target/m68k/helper.h
+++ b/target/m68k/helper.h
@@ -81,6 +81,7 @@ DEF_HELPER_3(fcos, void, env, fp, fp)
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(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 91f0435..3d66f69 100644
--- a/target/m68k/softfloat.c
+++ b/target/m68k/softfloat.c
@@ -23,6 +23,7 @@
#include "fpu/softfloat-macros.h"
#include "softfloat_fpsp_tables.h"
+#define pi_exp 0x4000
#define piby2_exp 0x3FFF
#define pi_sig LIT64(0xc90fdaa22168c235)
@@ -2232,3 +2233,72 @@ floatx80 floatx80_asin(floatx80 a, float_status *status)
return a;
}
+
+/*----------------------------------------------------------------------------
+ | Arc cosine
+ *----------------------------------------------------------------------------*/
+
+floatx80 floatx80_acos(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, 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) {
+ float_raise(float_flag_inexact, status);
+ return roundAndPackFloatx80(status->floatx80_rounding_precision, 0,
+ piby2_exp, pi_sig, 0, status);
+ }
+
+ compact = floatx80_make_compact(aExp, aSig);
+
+ if (compact >= 0x3FFF8000) { /* |X| >= 1 */
+ if (aExp == one_exp && aSig == one_sig) { /* |X| == 1 */
+ if (aSign) { /* X == -1 */
+ a = packFloatx80(0, pi_exp, pi_sig);
+ float_raise(float_flag_inexact, status);
+ return floatx80_move(a, status);
+ } else { /* X == +1 */
+ return packFloatx80(0, 0, 0);
+ }
+ } 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);
+ fp0 = a;
+
+ fp1 = floatx80_add(one, fp0, status); /* 1 + X */
+ fp0 = floatx80_sub(one, fp0, status); /* 1 - X */
+ fp0 = floatx80_div(fp0, fp1, status); /* (1-X)/(1+X) */
+ fp0 = floatx80_sqrt(fp0, status); /* SQRT((1-X)/(1+X)) */
+ fp0 = floatx80_atan(fp0, status); /* ATAN(SQRT((1-X)/(1+X))) */
+
+ status->float_rounding_mode = user_rnd_mode;
+ status->floatx80_rounding_precision = user_rnd_prec;
+
+ a = floatx80_add(fp0, fp0, status); /* 2 * ATAN(SQRT((1-X)/(1+X))) */
+
+ float_raise(float_flag_inexact, status);
+
+ return a;
+}
diff --git a/target/m68k/softfloat.h b/target/m68k/softfloat.h
index ca0eb67..1140491 100644
--- a/target/m68k/softfloat.h
+++ b/target/m68k/softfloat.h
@@ -39,4 +39,5 @@ floatx80 floatx80_sin(floatx80 a, float_status *status);
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);
#endif
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index d4169c4..5fad76c 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -5105,6 +5105,9 @@ DISAS_INSN(fpu)
case 0x5e: /* fdneg */
gen_helper_fdneg(cpu_env, cpu_dest, cpu_src);
break;
+ case 0x1c: /* facos */
+ gen_helper_facos(cpu_env, cpu_dest, cpu_src);
+ break;
case 0x1d: /* fcos */
gen_helper_fcos(cpu_env, cpu_dest, cpu_src);
break;