diff options
author | Laurent Vivier <laurent@vivier.eu> | 2018-02-24 21:18:02 +0100 |
---|---|---|
committer | Laurent Vivier <laurent@vivier.eu> | 2018-03-04 17:27:59 +0100 |
commit | 0d379c1709aa6b2d09dd3b493bfdf3a5fe6debcd (patch) | |
tree | 0c753eb9a4dac7440ecc97f20c36baa26e23be8b /target/m68k | |
parent | 0f605c889ca3fe9744166ad4149d0dff6dacb696 (diff) |
target/m68k: add fscale, fgetman and fgetexp
Using local m68k floatx80_getman(), floatx80_getexp(), floatx80_scale()
[copied from previous:
Written by Andreas Grabher for Previous, NeXT Computer Emulator.]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180224201802.911-5-laurent@vivier.eu>
Diffstat (limited to 'target/m68k')
-rw-r--r-- | target/m68k/fpu_helper.c | 15 | ||||
-rw-r--r-- | target/m68k/helper.h | 3 | ||||
-rw-r--r-- | target/m68k/softfloat.c | 144 | ||||
-rw-r--r-- | target/m68k/softfloat.h | 3 | ||||
-rw-r--r-- | target/m68k/translate.c | 9 |
5 files changed, 174 insertions, 0 deletions
diff --git a/target/m68k/fpu_helper.c b/target/m68k/fpu_helper.c index 8286228b81..cdb9b50462 100644 --- a/target/m68k/fpu_helper.c +++ b/target/m68k/fpu_helper.c @@ -542,3 +542,18 @@ void HELPER(frem)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1) make_quotient(env, res->d); } + +void HELPER(fgetexp)(CPUM68KState *env, FPReg *res, FPReg *val) +{ + res->d = floatx80_getexp(val->d, &env->fp_status); +} + +void HELPER(fgetman)(CPUM68KState *env, FPReg *res, FPReg *val) +{ + res->d = floatx80_getman(val->d, &env->fp_status); +} + +void HELPER(fscale)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1) +{ + res->d = floatx80_scale(val1->d, val0->d, &env->fp_status); +} diff --git a/target/m68k/helper.h b/target/m68k/helper.h index 76a0590c9c..c348dced3a 100644 --- a/target/m68k/helper.h +++ b/target/m68k/helper.h @@ -65,6 +65,9 @@ DEF_HELPER_3(fmovemd_st_postinc, i32, env, i32, i32) DEF_HELPER_3(fmovemd_ld_postinc, i32, env, i32, i32) 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/softfloat.c b/target/m68k/softfloat.c index 8c77757b4e..9cb141900c 100644 --- a/target/m68k/softfloat.c +++ b/target/m68k/softfloat.c @@ -22,6 +22,19 @@ #include "softfloat.h" #include "fpu/softfloat-macros.h" +static floatx80 propagateFloatx80NaNOneArg(floatx80 a, float_status *status) +{ + if (floatx80_is_signaling_nan(a, status)) { + float_raise(float_flag_invalid, status); + } + + if (status->default_nan_mode) { + return floatx80_default_nan(status); + } + + return floatx80_maybe_silence_nan(a, status); +} + /*---------------------------------------------------------------------------- | Returns the modulo remainder of the extended double-precision floating-point | value `a' with respect to the corresponding value `b'. @@ -103,3 +116,134 @@ floatx80 floatx80_mod(floatx80 a, floatx80 b, float_status *status) normalizeRoundAndPackFloatx80( 80, zSign, bExp + expDiff, aSig0, aSig1, status); } + +/*---------------------------------------------------------------------------- + | Returns the mantissa of the extended double-precision floating-point + | value `a'. + *----------------------------------------------------------------------------*/ + +floatx80 floatx80_getman(floatx80 a, float_status *status) +{ + flag aSign; + int32_t aExp; + uint64_t aSig; + + aSig = extractFloatx80Frac(a); + aExp = extractFloatx80Exp(a); + aSign = extractFloatx80Sign(a); + + if (aExp == 0x7FFF) { + if ((uint64_t) (aSig << 1)) { + return propagateFloatx80NaNOneArg(a , status); + } + float_raise(float_flag_invalid , status); + return floatx80_default_nan(status); + } + + if (aExp == 0) { + if (aSig == 0) { + return packFloatx80(aSign, 0, 0); + } + normalizeFloatx80Subnormal(aSig, &aExp, &aSig); + } + + return roundAndPackFloatx80(status->floatx80_rounding_precision, aSign, + 0x3FFF, aSig, 0, status); +} + +/*---------------------------------------------------------------------------- + | Returns the exponent of the extended double-precision floating-point + | value `a' as an extended double-precision value. + *----------------------------------------------------------------------------*/ + +floatx80 floatx80_getexp(floatx80 a, float_status *status) +{ + flag aSign; + int32_t aExp; + uint64_t aSig; + + aSig = extractFloatx80Frac(a); + aExp = extractFloatx80Exp(a); + aSign = extractFloatx80Sign(a); + + if (aExp == 0x7FFF) { + if ((uint64_t) (aSig << 1)) { + return propagateFloatx80NaNOneArg(a , status); + } + float_raise(float_flag_invalid , status); + return floatx80_default_nan(status); + } + + if (aExp == 0) { + if (aSig == 0) { + return packFloatx80(aSign, 0, 0); + } + normalizeFloatx80Subnormal(aSig, &aExp, &aSig); + } + + return int32_to_floatx80(aExp - 0x3FFF, status); +} + +/*---------------------------------------------------------------------------- + | Scales extended double-precision floating-point value in operand `a' by + | value `b'. The function truncates the value in the second operand 'b' to + | an integral value and adds that value to the exponent of the operand 'a'. + | The operation performed according to the IEC/IEEE Standard for Binary + | Floating-Point Arithmetic. + *----------------------------------------------------------------------------*/ + +floatx80 floatx80_scale(floatx80 a, floatx80 b, float_status *status) +{ + flag aSign, bSign; + int32_t aExp, bExp, shiftCount; + uint64_t aSig, bSig; + + aSig = extractFloatx80Frac(a); + aExp = extractFloatx80Exp(a); + aSign = extractFloatx80Sign(a); + bSig = extractFloatx80Frac(b); + bExp = extractFloatx80Exp(b); + bSign = extractFloatx80Sign(b); + + if (bExp == 0x7FFF) { + if ((uint64_t) (bSig << 1) || + ((aExp == 0x7FFF) && (uint64_t) (aSig << 1))) { + return propagateFloatx80NaN(a, b, status); + } + float_raise(float_flag_invalid , status); + return floatx80_default_nan(status); + } + if (aExp == 0x7FFF) { + if ((uint64_t) (aSig << 1)) { + return propagateFloatx80NaN(a, b, status); + } + return packFloatx80(aSign, floatx80_infinity.high, + floatx80_infinity.low); + } + if (aExp == 0) { + if (aSig == 0) { + return packFloatx80(aSign, 0, 0); + } + if (bExp < 0x3FFF) { + return a; + } + normalizeFloatx80Subnormal(aSig, &aExp, &aSig); + } + + if (bExp < 0x3FFF) { + return a; + } + + if (0x400F < bExp) { + aExp = bSign ? -0x6001 : 0xE000; + return roundAndPackFloatx80(status->floatx80_rounding_precision, + aSign, aExp, aSig, 0, status); + } + + shiftCount = 0x403E - bExp; + bSig >>= shiftCount; + aExp = bSign ? (aExp - bSig) : (aExp + bSig); + + return roundAndPackFloatx80(status->floatx80_rounding_precision, + aSign, aExp, aSig, 0, status); +} diff --git a/target/m68k/softfloat.h b/target/m68k/softfloat.h index 8d8ca0fc45..78fbc0cd0c 100644 --- a/target/m68k/softfloat.h +++ b/target/m68k/softfloat.h @@ -23,4 +23,7 @@ #include "fpu/softfloat.h" floatx80 floatx80_mod(floatx80 a, floatx80 b, float_status *status); +floatx80 floatx80_getman(floatx80 a, float_status *status); +floatx80 floatx80_getexp(floatx80 a, float_status *status); +floatx80 floatx80_scale(floatx80 a, floatx80 b, float_status *status); #endif diff --git a/target/m68k/translate.c b/target/m68k/translate.c index f8db26fa8e..dbb24f8d84 100644 --- a/target/m68k/translate.c +++ b/target/m68k/translate.c @@ -5072,6 +5072,12 @@ DISAS_INSN(fpu) case 0x5e: /* fdneg */ gen_helper_fdneg(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; @@ -5108,6 +5114,9 @@ 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; |