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x87 - Use CRT trig functions for sin/cos/tan until I figure out why the SoftFloat functions produce daft values. (no whatsnew)

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This commit is contained in:
Phil Bennett 2012-01-27 16:37:35 +00:00
parent 59023831d6
commit 2daf1a4395
1 changed files with 45 additions and 8 deletions
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53
src/emu/cpu/i386/x87ops.c
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@ -4,6 +4,7 @@
TODO:
- 80-bit precision for F2XM1, FYL2X, FPATAN
- Figure out why SoftFloat trig extensions produce bad values
- Cycle counts for all processors (currently using 486 counts)
- Precision-dependent cycle counts for divide instructions
- Last instruction, operand pointers etc.
@ -2157,10 +2158,18 @@ void x87_fptan(i386_state *cpustate, UINT8 modrm)
result1 = ST(0);
result2 = fx80_one;
#if 0 // TODO: Function produces bad values
if (floatx80_ftan(result1) != -1)
cpustate->x87_sw &= ~X87_SW_C2;
else
cpustate->x87_sw |= X87_SW_C2;
#else
double x = fx80_to_double(result1);
x = tan(x);
result1 = double_to_fx80(x);
cpustate->x87_sw &= ~X87_SW_C2;
#endif
}
if (x87_check_exceptions(cpustate))
@ -2211,10 +2220,18 @@ void x87_fsin(i386_state *cpustate, UINT8 modrm)
{
result = ST(0);
#if 0 // TODO: Function produces bad values
if (floatx80_fsin(result) != -1)
cpustate->x87_sw &= ~X87_SW_C2;
else
cpustate->x87_sw |= X87_SW_C2;
#else
double x = fx80_to_double(result);
x = sin(x);
result = double_to_fx80(x);
cpustate->x87_sw &= ~X87_SW_C2;
#endif
}
if (x87_check_exceptions(cpustate))
@ -2236,10 +2253,18 @@ void x87_fcos(i386_state *cpustate, UINT8 modrm)
{
result = ST(0);
#if 0 // TODO: Function produces bad values
if (floatx80_fcos(result) != -1)
cpustate->x87_sw &= ~X87_SW_C2;
else
cpustate->x87_sw |= X87_SW_C2;
#else
double x = fx80_to_double(result);
x = cos(x);
result = double_to_fx80(x);
cpustate->x87_sw &= ~X87_SW_C2;
#endif
}
if (x87_check_exceptions(cpustate))
@ -2268,10 +2293,22 @@ void x87_fsincos(i386_state *cpustate, UINT8 modrm)
s_result = c_result = ST(0);
#if 0 // TODO: Function produces bad values
if (sf_fsincos(s_result, &s_result, &c_result) != -1)
cpustate->x87_sw &= ~X87_SW_C2;
else
cpustate->x87_sw |= X87_SW_C2;
#else
double s = fx80_to_double(s_result);
double c = fx80_to_double(c_result);
s = sin(s);
c = cos(c);
s_result = double_to_fx80(s);
c_result = double_to_fx80(c);
cpustate->x87_sw &= ~X87_SW_C2;
#endif
}
if (x87_check_exceptions(cpustate))
@ -4277,7 +4314,7 @@ void build_x87_opcode_table_d8(i386_state *cpustate)
{
int modrm = 0;
for (modrm = 0; modrm < 0xff; ++modrm)
for (modrm = 0; modrm < 0x100; ++modrm)
{
void (*ptr)(i386_state *cpustate, UINT8 modrm) = x87_invalid;
@ -4319,7 +4356,7 @@ void build_x87_opcode_table_d9(i386_state *cpustate)
{
int modrm = 0;
for (modrm = 0; modrm < 0xff; ++modrm)
for (modrm = 0; modrm < 0x100; ++modrm)
{
void (*ptr)(i386_state *cpustate, UINT8 modrm) = x87_invalid;
@ -4397,7 +4434,7 @@ void build_x87_opcode_table_da(i386_state *cpustate)
{
int modrm = 0;
for (modrm = 0; modrm < 0xff; ++modrm)
for (modrm = 0; modrm < 0x100; ++modrm)
{
void (*ptr)(i386_state *cpustate, UINT8 modrm) = x87_invalid;
@ -4432,7 +4469,7 @@ void build_x87_opcode_table_db(i386_state *cpustate)
{
int modrm = 0;
for (modrm = 0; modrm < 0xff; ++modrm)
for (modrm = 0; modrm < 0x100; ++modrm)
{
void (*ptr)(i386_state *cpustate, UINT8 modrm) = x87_invalid;
@ -4468,7 +4505,7 @@ void build_x87_opcode_table_dc(i386_state *cpustate)
{
int modrm = 0;
for (modrm = 0; modrm < 0xff; ++modrm)
for (modrm = 0; modrm < 0x100; ++modrm)
{
void (*ptr)(i386_state *cpustate, UINT8 modrm) = x87_invalid;
@ -4508,7 +4545,7 @@ void build_x87_opcode_table_dd(i386_state *cpustate)
{
int modrm = 0;
for (modrm = 0; modrm < 0xff; ++modrm)
for (modrm = 0; modrm < 0x100; ++modrm)
{
void (*ptr)(i386_state *cpustate, UINT8 modrm) = x87_invalid;
@ -4545,7 +4582,7 @@ void build_x87_opcode_table_de(i386_state *cpustate)
{
int modrm = 0;
for (modrm = 0; modrm < 0xff; ++modrm)
for (modrm = 0; modrm < 0x100; ++modrm)
{
void (*ptr)(i386_state *cpustate, UINT8 modrm) = x87_invalid;
@ -4586,7 +4623,7 @@ void build_x87_opcode_table_df(i386_state *cpustate)
{
int modrm = 0;
for (modrm = 0; modrm < 0xff; ++modrm)
for (modrm = 0; modrm < 0x100; ++modrm)
{
void (*ptr)(i386_state *cpustate, UINT8 modrm) = x87_invalid;