diff options
Diffstat (limited to 'target/i386/fpu_helper.c')
| -rw-r--r-- | target/i386/fpu_helper.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/target/i386/fpu_helper.c b/target/i386/fpu_helper.c index b34fa78..568bd3b 100644 --- a/target/i386/fpu_helper.c +++ b/target/i386/fpu_helper.c @@ -767,10 +767,33 @@ void helper_fxtract(CPUX86State *env) &env->fp_status); fpush(env); ST0 = temp.d; + } else if (floatx80_invalid_encoding(ST0)) { + float_raise(float_flag_invalid, &env->fp_status); + ST0 = floatx80_default_nan(&env->fp_status); + fpush(env); + ST0 = ST1; + } else if (floatx80_is_any_nan(ST0)) { + if (floatx80_is_signaling_nan(ST0, &env->fp_status)) { + float_raise(float_flag_invalid, &env->fp_status); + ST0 = floatx80_silence_nan(ST0, &env->fp_status); + } + fpush(env); + ST0 = ST1; + } else if (floatx80_is_infinity(ST0)) { + fpush(env); + ST0 = ST1; + ST1 = floatx80_infinity; } else { int expdif; - expdif = EXPD(temp) - EXPBIAS; + if (EXPD(temp) == 0) { + int shift = clz64(temp.l.lower); + temp.l.lower <<= shift; + expdif = 1 - EXPBIAS - shift; + float_raise(float_flag_input_denormal, &env->fp_status); + } else { + expdif = EXPD(temp) - EXPBIAS; + } /* DP exponent bias */ ST0 = int32_to_floatx80(expdif, &env->fp_status); fpush(env); |