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feat: add scalar fexp support

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This commit is contained in:
Zhongdi LUO
2026-07-02 07:24:59 +00:00
parent 97a1eff701
commit 9251ba0a24
12 changed files with 327 additions and 14 deletions
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49
hw/dpi/float_dpi.cpp
View File

@@ -37,6 +37,7 @@ extern "C" {
void dpi_fdiv(bool enable, int dst_fmt, int64_t a, int64_t b, const svBitVecVal* frm, int64_t* result, svBitVecVal* fflags);
void dpi_fsqrt(bool enable, int dst_fmt, int64_t a, const svBitVecVal* frm, int64_t* result, svBitVecVal* fflags);
void dpi_fexp(bool enable, int dst_fmt, int64_t a, int64_t* result, svBitVecVal* fflags);
void dpi_ftoi(bool enable, int dst_fmt, int src_fmt, int64_t a, const svBitVecVal* frm, int64_t* result, svBitVecVal* fflags);
void dpi_ftou(bool enable, int dst_fmt, int src_fmt, int64_t a, const svBitVecVal* frm, int64_t* result, svBitVecVal* fflags);
@@ -83,6 +84,22 @@ inline int64_t check_boxing(int64_t a) {
return a;
}
inline float bits_to_float(uint32_t value) {
union {
uint32_t u;
float f;
} bits = {value};
return bits.f;
}
inline uint32_t float_to_bits(float value) {
union {
float f;
uint32_t u;
} bits = {value};
return bits.u;
}
void dpi_fadd(bool enable, int dst_fmt, int64_t a, int64_t b, const svBitVecVal* frm, int64_t* result, svBitVecVal* fflags) {
if (!enable)
return;
@@ -173,6 +190,38 @@ void dpi_fsqrt(bool enable, int dst_fmt, int64_t a, const svBitVecVal* frm, int6
}
}
void dpi_fexp(bool enable, int dst_fmt, int64_t a, int64_t* result, svBitVecVal* fflags) {
if (!enable)
return;
*fflags = 0;
if (dst_fmt) {
double input;
static_assert(sizeof(input) == sizeof(a), "unexpected double size");
__builtin_memcpy(&input, &a, sizeof(input));
double output = exp(input);
__builtin_memcpy(result, &output, sizeof(output));
if (isinf(output) && isfinite(input)) {
*fflags |= 0x05; // OF | NX
} else if (output == 0.0 && input < 0.0 && isfinite(input)) {
*fflags |= 0x03; // UF | NX
} else if (isfinite(input)) {
*fflags |= 0x01; // NX
}
} else {
uint32_t boxed = static_cast<uint32_t>(check_boxing(a));
float input = bits_to_float(boxed);
float output = expf(input);
*result = nan_box(float_to_bits(output));
if (isinf(output) && isfinite(input)) {
*fflags |= 0x05; // OF | NX
} else if (output == 0.0f && input < 0.0f && isfinite(input)) {
*fflags |= 0x03; // UF | NX
} else if (isfinite(input)) {
*fflags |= 0x01; // NX
}
}
}
void dpi_ftoi(bool enable, int dst_fmt, int src_fmt, int64_t a, const svBitVecVal* frm, int64_t* result, svBitVecVal* fflags) {
if (!enable)
return;

1
hw/dpi/float_dpi.vh
View File

@@ -26,6 +26,7 @@ import "DPI-C" function void dpi_fnmsub(input logic enable, input int dst_fmt, i
import "DPI-C" function void dpi_fdiv(input logic enable, input int dst_fmt, input longint a, input longint b, input bit[2:0] frm, output longint result, output bit[4:0] fflags);
import "DPI-C" function void dpi_fsqrt(input logic enable, input int dst_fmt, input longint a, input bit[2:0] frm, output longint result, output bit[4:0] fflags);
import "DPI-C" function void dpi_fexp(input logic enable, input int dst_fmt, input longint a, output longint result, output bit[4:0] fflags);
import "DPI-C" function void dpi_ftoi(input logic enable, input int dst_fmt, input int src_fmt, input longint a, input bit[2:0] frm, output longint result, output bit[4:0] fflags);
import "DPI-C" function void dpi_ftou(input logic enable, input int dst_fmt, input int src_fmt, input longint a, input bit[2:0] frm, output longint result, output bit[4:0] fflags);