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[Qemu-devel] [PATCH 4/4] target-m68k: add fscale, fgetman and fgetexp
From: |
Laurent Vivier |
Subject: |
[Qemu-devel] [PATCH 4/4] target-m68k: add fscale, fgetman and fgetexp |
Date: |
Mon, 3 Jul 2017 18:23:28 +0200 |
Signed-off-by: Laurent Vivier <address@hidden>
---
target/m68k/fpu_helper.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++
target/m68k/helper.h | 3 ++
target/m68k/translate.c | 9 ++++
3 files changed, 118 insertions(+)
diff --git a/target/m68k/fpu_helper.c b/target/m68k/fpu_helper.c
index 715b9be..88957fa 100644
--- a/target/m68k/fpu_helper.c
+++ b/target/m68k/fpu_helper.c
@@ -771,3 +771,109 @@ void HELPER(frem)(CPUM68KState *env, FPReg *res, FPReg
*val0, FPReg *val1)
make_quotient(env, dst, sign);
res->d = ldouble_to_floatx80(dst, &env->fp_status);
}
+
+void HELPER(fgetexp)(CPUM68KState *env, FPReg *res, FPReg *val)
+{
+ int32_t exp;
+
+ if (floatx80_is_infinity(val->d)) {
+ res->d = floatx80_default_nan(NULL);
+ /* FIXME: set the OPERR bit int he FPSR */
+ return;
+ }
+ if (floatx80_is_zero(val->d)) {
+ *res = *val;
+ return;
+ }
+ if (floatx80_is_zero_or_denormal(val->d)) {
+ res->d = int32_to_floatx80(-16384, &env->fp_status);
+ return;
+ }
+
+ if (floatx80_is_any_nan(val->d)) {
+ res->d = floatx80_default_nan(NULL);
+ return;
+ }
+
+ exp = (val->l.upper & 0x7fff) - 0x3fff;
+
+ res->d = int32_to_floatx80(exp, &env->fp_status);
+}
+
+void HELPER(fgetman)(CPUM68KState *env, FPReg *res, FPReg *val)
+{
+ if (floatx80_is_infinity(val->d)) {
+ res->d = floatx80_default_nan(NULL);
+ /* FIXME: set the OPERR bit int he FPSR */
+ return;
+ }
+ if (floatx80_is_zero(val->d) ||
+ floatx80_is_any_nan(val->d)) {
+ *res = *val;
+ return;
+ }
+
+ res->l.upper = (val->l.upper & 0x8000) | 0x3fff;
+ if (floatx80_is_zero_or_denormal(val->d)) {
+ res->l.lower = val->l.lower << 1;
+ } else {
+ res->l.lower = val->l.lower;
+ }
+}
+
+void HELPER(fscale)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
+{
+ int rounding_mode;
+ int32_t scale;
+ int32_t exp;
+
+ if (floatx80_is_infinity(val0->d)) {
+ res->d = floatx80_default_nan(NULL);
+ /* FIXME: set the OPERR bit in the FPSR */
+ return;
+ }
+ if (floatx80_is_any_nan(val0->d)) {
+ res->d = floatx80_default_nan(NULL);
+ return;
+ }
+ if (floatx80_is_infinity(val1->d) ||
+ floatx80_is_zero_or_denormal(val1->d)) {
+ *res = *val1;
+ return;
+ }
+ if (floatx80_is_zero(val0->d)) {
+ res->d = floatx80_round(val1->d, &env->fp_status);
+ return;
+ }
+
+ rounding_mode = get_float_rounding_mode(&env->fp_status);
+ set_float_rounding_mode(float_round_to_zero, &env->fp_status);
+ scale = floatx80_to_int32(val0->d, &env->fp_status);
+ set_float_rounding_mode(rounding_mode, &env->fp_status);
+
+ if (scale >= 16384) {
+ if (floatx80_is_neg(val1->d)) {
+ res->d = floatx80_chs(floatx80_infinity);
+ } else {
+ res->d = floatx80_infinity;
+ }
+ /* FIXME: set OVFL in FPSR */
+ return;
+ }
+ if (scale <= -16384) {
+ if (floatx80_is_neg(val1->d)) {
+ res->d = floatx80_chs(floatx80_zero);
+ } else {
+ res->d = floatx80_zero;
+ }
+ /* FIXME: set UNFL in FPSR */
+ return;
+ }
+
+ exp = (val1->l.upper & 0x7fff) + scale;
+
+ res->l.upper = (val1->l.upper & 0x8000) | (exp & 0x7fff);
+ res->l.lower = val1->l.lower;
+
+ res->d = floatx80_round(res->d, &env->fp_status);
+}
diff --git a/target/m68k/helper.h b/target/m68k/helper.h
index 889978e..a6be815 100644
--- a/target/m68k/helper.h
+++ b/target/m68k/helper.h
@@ -79,6 +79,9 @@ DEF_HELPER_3(fcos, void, env, fp, fp)
DEF_HELPER_4(fsincos, void, env, fp, fp, fp)
DEF_HELPER_4(fmod, void, env, fp, fp, fp)
DEF_HELPER_4(frem, void, env, fp, fp, fp)
+DEF_HELPER_3(fgetexp, void, env, fp, fp)
+DEF_HELPER_3(fgetman, void, env, fp, fp)
+DEF_HELPER_4(fscale, void, env, fp, fp, fp)
DEF_HELPER_3(mac_move, void, env, i32, i32)
DEF_HELPER_3(macmulf, i64, env, i32, i32)
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index fe9e0bf..348f4fb 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -4718,6 +4718,12 @@ DISAS_INSN(fpu)
case 0x1d: /* fcos */
gen_helper_fcos(cpu_env, cpu_dest, cpu_src);
break;
+ case 0x1e: /* fgetexp */
+ gen_helper_fgetexp(cpu_env, cpu_dest, cpu_src);
+ break;
+ case 0x1f: /* fgetman */
+ gen_helper_fgetman(cpu_env, cpu_dest, cpu_src);
+ break;
case 0x20: /* fdiv */
gen_helper_fdiv(cpu_env, cpu_dest, cpu_src, cpu_dest);
break;
@@ -4754,6 +4760,9 @@ DISAS_INSN(fpu)
case 0x25: /* frem */
gen_helper_frem(cpu_env, cpu_dest, cpu_src, cpu_dest);
break;
+ case 0x26: /* fscale */
+ gen_helper_fscale(cpu_env, cpu_dest, cpu_src, cpu_dest);
+ break;
case 0x27: /* fsglmul */
gen_helper_fsglmul(cpu_env, cpu_dest, cpu_src, cpu_dest);
break;
--
2.9.4
[Qemu-devel] [PATCH 1/4] softfloat: use floatx80_infinity in softfloat, Laurent Vivier, 2017/07/03
[Qemu-devel] [PATCH 2/4] target/m68k: add FPU trigonometric instructions, Laurent Vivier, 2017/07/03