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Add better rounded value for FLDLN2. Fixes rendering in Zone Raiders.

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This commit is contained in:
SarahW 2018-03-28 20:33:18 +01:00
commit a4b8eba56b
3 changed files with 24 additions and 2 deletions
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9
src/codegen_ops_fpu.h
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@ -634,5 +634,12 @@ opFLDimm(L2T, 3.3219280948873623)
opFLDimm(L2E, 1.4426950408889634);
opFLDimm(PI, 3.141592653589793);
opFLDimm(EG2, 0.3010299956639812);
opFLDimm(LN2, 0.693147180559945);
opFLDimm(Z, 0.0)
static uint32_t ropFLDLN2(uint8_t opcode, uint32_t fetchdat, uint32_t op_32, uint32_t op_pc, codeblock_t *block)
{
FP_ENTER();
FP_LOAD_IMM_Q(0x3fe62e42fefa39f0ull);
return op_pc;
}

15
src/x87_ops.h
View file

@ -43,6 +43,21 @@ static inline void x87_push(double i)
cpu_state.tag[cpu_state.TOP&7] = (i == 0.0) ? 1 : 0;
}
static inline void x87_push_u64(uint64_t i)
{
union
{
double d;
uint64_t ll;
} td;
td.ll = i;
cpu_state.TOP=(cpu_state.TOP-1)&7;
cpu_state.ST[cpu_state.TOP] = td.d;
cpu_state.tag[cpu_state.TOP&7] = (td.d == 0.0) ? 1 : 0;
}
static inline double x87_pop()
{
double t = cpu_state.ST[cpu_state.TOP];

2
src/x87_ops_misc.h
View file

@ -460,7 +460,7 @@ static int opFLDLN2(uint32_t fetchdat)
FP_ENTER();
cpu_state.pc++;
if (fplog) pclog("FLDLN2\n");
x87_push(0.693147180559945);
x87_push_u64(0x3fe62e42fefa39f0ull);
CLOCK_CYCLES(8);
return 0;
}