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More changes to FPU nearest rounding, Unreal works again.

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This commit is contained in:
TomW 2015-09-28 20:33:36 +01:00
commit 33685c3318
3 changed files with 40 additions and 13 deletions
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11
src/codegen_ops_x86-64.h
View file

@ -3737,10 +3737,19 @@ static void FP_LOAD_REG_D(int reg, int *host_reg1, int *host_reg2)
} }
static int64_t x87_fround(double b) static int64_t x87_fround(double b)
{ {
int64_t a, c;
switch ((npxc>>10)&3) switch ((npxc>>10)&3)
{ {
case 0: /*Nearest*/ case 0: /*Nearest*/
return (int64_t)(b+0.5); a = (int64_t)floor(b);
c = (int64_t)floor(b + 1.0);
if ((b - a) < (b - c))
return a;
else if ((b - a) > (b - c))
return b;
else
return (a & 1) ? c : a;
case 1: /*Down*/ case 1: /*Down*/
return (int64_t)floor(b); return (int64_t)floor(b);
case 2: /*Up*/ case 2: /*Up*/

28
src/codegen_ops_x86.h
View file

@ -2254,13 +2254,19 @@ static void FP_RESTORE_ROUNDING()
static int32_t x87_fround32(double b) static int32_t x87_fround32(double b)
{ {
int64_t a, c;
switch ((npxc>>10)&3) switch ((npxc>>10)&3)
{ {
case 0: /*Nearest*/ case 0: /*Nearest*/
if (b < 0.0) a = (int64_t)floor(b);
return (int32_t)(b-0.5); c = (int64_t)floor(b + 1.0);
else if ((b - a) < (b - c))
return (int32_t)(b+0.5); return a;
else if ((b - a) > (b - c))
return b;
else
return (a & 1) ? c : a;
case 1: /*Down*/ case 1: /*Down*/
return (int32_t)floor(b); return (int32_t)floor(b);
case 2: /*Up*/ case 2: /*Up*/
@ -2271,13 +2277,19 @@ static int32_t x87_fround32(double b)
} }
static int64_t x87_fround64(double b) static int64_t x87_fround64(double b)
{ {
int64_t a, c;
switch ((npxc>>10)&3) switch ((npxc>>10)&3)
{ {
case 0: /*Nearest*/ case 0: /*Nearest*/
if (b < 0.0) a = (int64_t)floor(b);
return (int64_t)(b-0.5); c = (int64_t)floor(b + 1.0);
else if ((b - a) < (b - c))
return (int64_t)(b+0.5); return a;
else if ((b - a) > (b - c))
return b;
else
return (a & 1) ? c : a;
case 1: /*Down*/ case 1: /*Down*/
return (int64_t)floor(b); return (int64_t)floor(b);
case 2: /*Up*/ case 2: /*Up*/

14
src/x87_ops.h
View file

@ -66,13 +66,19 @@ static inline double x87_pop()
static inline int64_t x87_fround(double b) static inline int64_t x87_fround(double b)
{ {
int64_t a, c;
switch ((npxc>>10)&3) switch ((npxc>>10)&3)
{ {
case 0: /*Nearest*/ case 0: /*Nearest*/
if (b < 0.0) a = (int64_t)floor(b);
return (int64_t)(b-0.5); c = (int64_t)floor(b + 1.0);
else if ((b - a) < (b - c))
return (int64_t)(b+0.5); return a;
else if ((b - a) > (b - c))
return b;
else
return (a & 1) ? c : a;
case 1: /*Down*/ case 1: /*Down*/
return (int64_t)floor(b); return (int64_t)floor(b);
case 2: /*Up*/ case 2: /*Up*/