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fpu dpi update

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This commit is contained in:
Blaise Tine 2021-03-31 02:36:34 -07:00
parent b3167d763b
commit d15e33e87f
3 changed files with 52 additions and 20 deletions
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60
hw/dpi/float_dpi.cpp
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@ -26,9 +26,9 @@ extern "C" {
void dpi_utof(int a, int frm, int* result, int* fflags);
void dpi_fclss(int a, int* result);
void dpi_fsgnj(int a, int* result);
void dpi_fsgnjn(int a, int* result);
void dpi_fsgnjx(int a, int* result);
void dpi_fsgnj(int a, int b, int* result);
void dpi_fsgnjn(int a, int b, int* result);
void dpi_fsgnjx(int a, int b, int* result);
void dpi_flt(int a, int b, int* result, int* fflags);
void dpi_fle(int a, int b, int* result, int* fflags);
@ -244,21 +244,53 @@ void dpi_fmax(int a, int b, int* result, int* fflags) {
}
void dpi_fclss(int a, int* result) {
// TODO
*result = 0;
int r = 0; // clear all bits
bool fsign = (a >> 31);
uint32_t expo = (a >> 23) & 0xFF;
uint32_t fraction = a & 0x7FFFFF;
if ((expo == 0) && (fraction == 0)) {
r = fsign ? (1 << 3) : (1 << 4); // +/- 0
} else if ((expo == 0) && (fraction != 0)) {
r = fsign ? (1 << 2) : (1 << 5); // +/- subnormal
} else if ((expo == 0xFF) && (fraction == 0)) {
r = fsign ? (1<<0) : (1<<7); // +/- infinity
} else if ((expo == 0xFF ) && (fraction != 0)) {
if (!fsign && (fraction == 0x00400000)) {
r = (1 << 9); // quiet NaN
} else {
r = (1 << 8); // signaling NaN
}
} else {
r = fsign ? (1 << 1) : (1 << 6); // +/- normal
}
*result = r;
}
void dpi_fsgnj(int a, int* result) {
// TODO
*result = 0;
void dpi_fsgnj(int a, int b, int* result) {
int sign = b & 0x80000000;
int r = sign | (a & 0x7FFFFFFF);
*result = r;
}
void dpi_fsgnjn(int a, int* result) {
// TODO
*result = 0;
void dpi_fsgnjn(int a, int b, int* result) {
int sign = ~b & 0x80000000;
int r = sign | (a & 0x7FFFFFFF);
*result = r;
}
void dpi_fsgnjx(int a, int* result) {
// TODO
*result = 0;
void dpi_fsgnjx(int a, int b, int* result) {
int sign1 = a & 0x80000000;
int sign2 = b & 0x80000000;
int r = (sign1 ^ sign2) | (a & 0x7FFFFFFF);
*result = r;
}