[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PULL v2 4/8] target/m68k: implement flog10
From: |
Laurent Vivier |
Subject: |
[Qemu-devel] [PULL v2 4/8] target/m68k: implement flog10 |
Date: |
Fri, 9 Mar 2018 15:57:13 +0100 |
Using a local m68k floatx80_log10()
[copied from previous:
Written by Andreas Grabher for Previous, NeXT Computer Emulator.]
Signed-off-by: Laurent Vivier <address@hidden>
Message-Id: <address@hidden>
---
target/m68k/fpu_helper.c | 5 +++++
target/m68k/helper.h | 1 +
target/m68k/softfloat.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++
target/m68k/softfloat.h | 1 +
target/m68k/translate.c | 3 +++
5 files changed, 67 insertions(+)
diff --git a/target/m68k/fpu_helper.c b/target/m68k/fpu_helper.c
index cc6d3dfa52..2628534136 100644
--- a/target/m68k/fpu_helper.c
+++ b/target/m68k/fpu_helper.c
@@ -567,3 +567,8 @@ void HELPER(flogn)(CPUM68KState *env, FPReg *res, FPReg
*val)
{
res->d = floatx80_logn(val->d, &env->fp_status);
}
+
+void HELPER(flog10)(CPUM68KState *env, FPReg *res, FPReg *val)
+{
+ res->d = floatx80_log10(val->d, &env->fp_status);
+}
diff --git a/target/m68k/helper.h b/target/m68k/helper.h
index 68e5f4c0a7..d1f38f260f 100644
--- a/target/m68k/helper.h
+++ b/target/m68k/helper.h
@@ -70,6 +70,7 @@ DEF_HELPER_3(fgetman, void, env, fp, fp)
DEF_HELPER_4(fscale, void, env, fp, fp, fp)
DEF_HELPER_3(flognp1, void, env, fp, fp)
DEF_HELPER_3(flogn, void, env, fp, fp)
+DEF_HELPER_3(flog10, 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 180a17c39b..22fd7f6341 100644
--- a/target/m68k/softfloat.c
+++ b/target/m68k/softfloat.c
@@ -658,3 +658,60 @@ floatx80 floatx80_logn(floatx80 a, float_status *status)
return a;
}
}
+
+/*----------------------------------------------------------------------------
+ | Log base 10
+
*----------------------------------------------------------------------------*/
+
+floatx80 floatx80_log10(floatx80 a, float_status *status)
+{
+ flag aSign;
+ int32_t aExp;
+ uint64_t aSig;
+
+ int8_t user_rnd_mode, user_rnd_prec;
+
+ floatx80 fp0, fp1;
+
+ aSig = extractFloatx80Frac(a);
+ aExp = extractFloatx80Exp(a);
+ aSign = extractFloatx80Sign(a);
+
+ if (aExp == 0x7FFF) {
+ if ((uint64_t) (aSig << 1)) {
+ propagateFloatx80NaNOneArg(a, status);
+ }
+ if (aSign == 0) {
+ return packFloatx80(0, floatx80_infinity.high,
+ floatx80_infinity.low);
+ }
+ }
+
+ if (aExp == 0 && aSig == 0) {
+ float_raise(float_flag_divbyzero, status);
+ return packFloatx80(1, floatx80_infinity.high,
+ floatx80_infinity.low);
+ }
+
+ if (aSign) {
+ float_raise(float_flag_invalid, status);
+ return floatx80_default_nan(status);
+ }
+
+ 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;
+
+ fp0 = floatx80_logn(a, status);
+ fp1 = packFloatx80(0, 0x3FFD, LIT64(0xDE5BD8A937287195)); /* INV_L10 */
+
+ status->float_rounding_mode = user_rnd_mode;
+ status->floatx80_rounding_precision = user_rnd_prec;
+
+ a = floatx80_mul(fp0, fp1, status); /* LOGN(X)*INV_L10 */
+
+ float_raise(float_flag_inexact, status);
+
+ return a;
+}
diff --git a/target/m68k/softfloat.h b/target/m68k/softfloat.h
index 161bd6dff7..ac29e76189 100644
--- a/target/m68k/softfloat.h
+++ b/target/m68k/softfloat.h
@@ -29,4 +29,5 @@ floatx80 floatx80_scale(floatx80 a, floatx80 b, float_status
*status);
floatx80 floatx80_move(floatx80 a, float_status *status);
floatx80 floatx80_lognp1(floatx80 a, float_status *status);
floatx80 floatx80_logn(floatx80 a, float_status *status);
+floatx80 floatx80_log10(floatx80 a, float_status *status);
#endif
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index 705b9b0d5b..f1130df314 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -5060,6 +5060,9 @@ DISAS_INSN(fpu)
case 0x14: /* flogn */
gen_helper_flogn(cpu_env, cpu_dest, cpu_src);
break;
+ case 0x15: /* flog10 */
+ gen_helper_flog10(cpu_env, cpu_dest, cpu_src);
+ break;
case 0x18: /* fabs */
gen_helper_fabs(cpu_env, cpu_dest, cpu_src);
break;
--
2.14.3
- [Qemu-devel] [PULL v2 0/8] M68k for 2.12 patches, Laurent Vivier, 2018/03/09
- [Qemu-devel] [PULL v2 1/8] target/m68k: define floatx80_move(), Laurent Vivier, 2018/03/09
- [Qemu-devel] [PULL v2 4/8] target/m68k: implement flog10,
Laurent Vivier <=
- [Qemu-devel] [PULL v2 2/8] target/m68k: implement flognp1, Laurent Vivier, 2018/03/09
- [Qemu-devel] [PULL v2 3/8] target/m68k: implement flogn, Laurent Vivier, 2018/03/09
- [Qemu-devel] [PULL v2 5/8] target/m68k: implement flog2, Laurent Vivier, 2018/03/09
- [Qemu-devel] [PULL v2 8/8] target/m68k: implement ftentox, Laurent Vivier, 2018/03/09
- [Qemu-devel] [PULL v2 6/8] target/m68k: implement fetox, Laurent Vivier, 2018/03/09
- [Qemu-devel] [PULL v2 7/8] target/m68k: implement ftwotox, Laurent Vivier, 2018/03/09
- Re: [Qemu-devel] [PULL v2 0/8] M68k for 2.12 patches, Peter Maydell, 2018/03/12