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Replaced my implmenetation of FXTRACT with TC1995's.

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This commit is contained in:
OBattler
2023-04-30 00:32:50 +02:00
parent 071c05e65f
commit 3ea8a9607f
1 changed files with 10 additions and 3 deletions
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13
src/cpu/x87_ops_misc.h
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@@ -36,12 +36,19 @@ opFNOP(uint32_t fetchdat)
static int
opFXTRACT(uint32_t fetchdat)
{
double_decompose_t temp = (double_decompose_t) ST(0);
x87_conv_t test;
int64_t exp80, exp80final;
double mant;
FP_ENTER();
cpu_state.pc++;
ST(0) = (double) temp.exponent;
x87_push((double) temp.mantissa);
test.eind.d = ST(0);
exp80 = test.eind.ll & (0x7ff0000000000000ll);
exp80final = (exp80 >> 52) - BIAS64;
mant = test.eind.d / (pow(2.0, (double)exp80final));
ST(0) = (double)exp80final;
FP_TAG_VALID;
x87_push(mant);
CLOCK_CYCLES_FPU((fpu_type >= FPU_487SX) ? (x87_timings.fxtract) : (x87_timings.fxtract * cpu_multi));
CONCURRENCY_CYCLES((fpu_type >= FPU_487SX) ? (x87_concurrency.fxtract) : (x87_concurrency.fxtract * cpu_multi));
return 0;