mirror of
https://github.com/FEX-Emu/FEX.git
synced 2026-10-06 14:00:16 +02:00
Alyssa Rosenzweig
af21b8f3c7
It is not an external component, and it makes paths needlessly long. Ryan seemed amenable to this when we discussed on IRC earlier. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
581 lines
12 KiB
C++
581 lines
12 KiB
C++
#pragma once
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#include <FEXCore/Utils/BitUtils.h>
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#include <FEXCore/Utils/LogManager.h>
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#include <FEXCore/fextl/sstream.h>
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#include <FEXCore/fextl/string.h>
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#include <cmath>
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#include <cstring>
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#include <stdint.h>
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extern "C" {
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#include "SoftFloat-3e/platform.h"
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#include "SoftFloat-3e/softfloat.h"
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}
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struct FEX_PACKED X80SoftFloat {
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#ifdef _M_X86_64
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// Define this to push some operations to x87
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// Only useful to see if precision loss is killing something
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// #define DEBUG_X86_FLOAT
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#ifdef DEBUG_X86_FLOAT
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#define BIGFLOAT long double
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#define BIGFLOATSIZE 10
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#else
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#define BIGFLOAT __float128
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#define BIGFLOATSIZE 16
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#endif
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#elif defined(_M_ARM_64)
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#define BIGFLOAT long double
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#define BIGFLOATSIZE 16
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#else
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#error No 128bit float for this target!
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#endif
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#ifndef _WIN32
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#define LIBRARY_PRECISION BIGFLOAT
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#else
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// Mingw Win32 libraries don't have `__float128` helpers. Needs to use a lower precision.
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#define LIBRARY_PRECISION double
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#endif
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uint64_t Significand : 64;
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uint16_t Exponent : 15;
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uint16_t Sign : 1;
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X80SoftFloat() { memset(this, 0, sizeof(*this)); }
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X80SoftFloat(uint16_t _Sign, uint16_t _Exponent, uint64_t _Significand)
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: Significand {_Significand}
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, Exponent {_Exponent}
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, Sign {_Sign}
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{
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}
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fextl::string str() const {
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fextl::ostringstream string;
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string << std::hex << Sign;
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string << "_" << Exponent;
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string << "_" << (Significand >> 63);
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string << "_" << (Significand & ((1ULL << 63) - 1));
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return string.str();
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}
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// Ops
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static X80SoftFloat FADD(X80SoftFloat const &lhs, X80SoftFloat const &rhs) {
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#ifdef DEBUG_X86_FLOAT
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[rhs]; # st1
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fldt %[lhs]; # st0
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faddp;
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fstpt %[result];
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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, [rhs] "m" (rhs)
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: "st", "st(1)");
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return Result;
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#else
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return extF80_add(lhs, rhs);
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#endif
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}
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static X80SoftFloat FSUB(X80SoftFloat const &lhs, X80SoftFloat const &rhs) {
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#ifdef DEBUG_X86_FLOAT
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[rhs]; # st1
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fldt %[lhs]; # st0
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fsubp;
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fstpt %[result];
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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, [rhs] "m" (rhs)
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: "st", "st(1)");
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return Result;
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#else
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return extF80_sub(lhs, rhs);
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#endif
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}
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static X80SoftFloat FMUL(X80SoftFloat const &lhs, X80SoftFloat const &rhs) {
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#ifdef DEBUG_X86_FLOAT
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[rhs]; # st1
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fldt %[lhs]; # st0
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fmulp;
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fstpt %[result];
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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, [rhs] "m" (rhs)
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: "st", "st(1)");
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return Result;
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#else
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return extF80_mul(lhs, rhs);
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#endif
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}
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static X80SoftFloat FDIV(X80SoftFloat const &lhs, X80SoftFloat const &rhs) {
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#ifdef DEBUG_X86_FLOAT
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[rhs]; # st1
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fldt %[lhs]; # st0
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fdivp;
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fstpt %[result];
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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, [rhs] "m" (rhs)
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: "st", "st(1)");
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return Result;
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#else
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return extF80_div(lhs, rhs);
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#endif
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}
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static X80SoftFloat FREM(X80SoftFloat const &lhs, X80SoftFloat const &rhs) {
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#if defined(DEBUG_X86_FLOAT)
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[rhs]; # st1
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fldt %[lhs]; # st0
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fprem;
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fstpt %[result];
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ffreep %%st(0);
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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, [rhs] "m" (rhs)
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: "st", "st(1)");
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return Result;
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#else
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return extF80_rem(lhs, rhs);
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#endif
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}
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static X80SoftFloat FREM1(X80SoftFloat const &lhs, X80SoftFloat const &rhs) {
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#if defined(DEBUG_X86_FLOAT)
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[rhs]; # st1
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fldt %[lhs]; # st0
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fprem1;
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fstpt %[result];
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ffreep %%st(0);
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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, [rhs] "m" (rhs)
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: "st", "st(1)");
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return Result;
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#else
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return extF80_rem(lhs, rhs);
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#endif
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}
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static X80SoftFloat FRNDINT(X80SoftFloat const &lhs) {
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return extF80_roundToInt(lhs, softfloat_roundingMode, false);
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}
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static X80SoftFloat FRNDINT(X80SoftFloat const &lhs, uint_fast8_t RoundMode) {
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return extF80_roundToInt(lhs, RoundMode, false);
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}
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static X80SoftFloat FXTRACT_SIG(X80SoftFloat const &lhs) {
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#if defined(DEBUG_X86_FLOAT)
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[lhs]; # st0
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fxtract;
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fstpt %[result];
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ffreep %%st(0);
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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: "st", "st(1)");
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return Result;
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#else
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X80SoftFloat Tmp = lhs;
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Tmp.Exponent = 0x3FFF;
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Tmp.Sign = lhs.Sign;
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return Tmp;
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#endif
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}
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static X80SoftFloat FXTRACT_EXP(X80SoftFloat const &lhs) {
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#if defined(DEBUG_X86_FLOAT)
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[lhs]; # st0
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fxtract;
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ffreep %%st(0);
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fstpt %[result];
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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: "st", "st(1)");
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return Result;
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#else
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int32_t TrueExp = lhs.Exponent - ExponentBias;
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return i32_to_extF80(TrueExp);
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#endif
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}
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static void FCMP(X80SoftFloat const &lhs, X80SoftFloat const &rhs, bool *eq, bool *lt, bool *nan) {
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*eq = extF80_eq(lhs, rhs);
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*lt = extF80_lt(lhs, rhs);
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*nan = IsNan(lhs) || IsNan(rhs);
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}
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static X80SoftFloat FSCALE(X80SoftFloat const &lhs, X80SoftFloat const &rhs) {
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WARN_ONCE_FMT("x87: Application used FSCALE which may have accuracy problems");
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#ifdef DEBUG_X86_FLOAT
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[rhs]; # st1
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fldt %[lhs]; # st0
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fscale; # st0 = st0 * 2^(rdint(st1))
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fstpt %[result];
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ffreep %%st(0);
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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, [rhs] "m" (rhs)
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: "st", "st(1)");
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return Result;
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#else
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X80SoftFloat Int = FRNDINT(rhs, softfloat_round_minMag);
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LIBRARY_PRECISION Src2_d = Int;
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Src2_d = exp2l(Src2_d);
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X80SoftFloat Src2_X80 = Src2_d;
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X80SoftFloat Result = extF80_mul(lhs, Src2_X80);
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return Result;
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#endif
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}
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static X80SoftFloat F2XM1(X80SoftFloat const &lhs) {
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WARN_ONCE_FMT("x87: Application used F2XM1 which may have accuracy problems");
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#ifdef DEBUG_X86_FLOAT
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[lhs]; # st0
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f2xm1; # st0 = 2^st(0) - 1
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fstpt %[result];
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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: "st");
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return Result;
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#else
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LIBRARY_PRECISION Src1_d = lhs;
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LIBRARY_PRECISION Result = exp2l(Src1_d);
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Result -= 1.0;
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return Result;
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#endif
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}
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static X80SoftFloat FYL2X(X80SoftFloat const &lhs, X80SoftFloat const &rhs) {
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WARN_ONCE_FMT("x87: Application used FYL2X which may have accuracy problems");
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#ifdef DEBUG_X86_FLOAT
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[rhs]; # st(1)
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fldt %[lhs]; # st(0)
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fyl2x; # st(1) * log2l(st(0))
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fstpt %[result];
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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, [rhs] "m" (rhs)
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: "st", "st(1)");
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return Result;
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#else
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LIBRARY_PRECISION Src1_d = lhs;
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LIBRARY_PRECISION Src2_d = rhs;
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LIBRARY_PRECISION Tmp = Src2_d * log2l(Src1_d);
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return Tmp;
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#endif
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}
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static X80SoftFloat FATAN(X80SoftFloat const &lhs, X80SoftFloat const &rhs) {
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WARN_ONCE_FMT("x87: Application used FATAN which may have accuracy problems");
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#ifdef DEBUG_X86_FLOAT
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[lhs];
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fldt %[rhs];
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fpatan;
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fstpt %[result];
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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, [rhs] "m" (rhs)
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: "st", "st(1)");
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return Result;
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#else
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LIBRARY_PRECISION Src1_d = lhs;
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LIBRARY_PRECISION Src2_d = rhs;
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LIBRARY_PRECISION Tmp = atan2l(Src1_d, Src2_d);
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return Tmp;
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#endif
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}
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static X80SoftFloat FTAN(X80SoftFloat const &lhs) {
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WARN_ONCE_FMT("x87: Application used FTAN which may have accuracy problems");
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#ifdef DEBUG_X86_FLOAT
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[lhs]; # st0
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fptan;
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ffreep %%st(0);
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fstpt %[result];
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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: "st");
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return Result;
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#else
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LIBRARY_PRECISION Src_d = lhs;
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Src_d = tanl(Src_d);
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return Src_d;
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#endif
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}
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static X80SoftFloat FSIN(X80SoftFloat const &lhs) {
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WARN_ONCE_FMT("x87: Application used FSIN which may have accuracy problems");
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#ifdef DEBUG_X86_FLOAT
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[lhs]; # st0
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fsin;
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fstpt %[result];
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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: "st");
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return Result;
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#else
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LIBRARY_PRECISION Src_d = lhs;
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Src_d = sinl(Src_d);
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return Src_d;
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#endif
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}
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static X80SoftFloat FCOS(X80SoftFloat const &lhs) {
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WARN_ONCE_FMT("x87: Application used FCOS which may have accuracy problems");
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#ifdef DEBUG_X86_FLOAT
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[lhs]; # st0
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fcos;
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fstpt %[result];
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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: "st");
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return Result;
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#else
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LIBRARY_PRECISION Src_d = lhs;
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Src_d = cosl(Src_d);
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return Src_d;
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#endif
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}
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static X80SoftFloat FSQRT(X80SoftFloat const &lhs) {
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#ifdef DEBUG_X86_FLOAT
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BIGFLOAT Result;
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asm (R"(
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fninit;
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fldt %[lhs]; # st0
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fsqrt;
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fstpt %[result];
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)"
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: [result] "=m" (Result)
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: [lhs] "m" (lhs)
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: "st");
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return Result;
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#else
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return extF80_sqrt(lhs);
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#endif
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}
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operator float() const {
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const float32_t Result = extF80_to_f32(*this);
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return FEXCore::BitCast<float>(Result);
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}
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operator double() const {
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const float64_t Result = extF80_to_f64(*this);
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return FEXCore::BitCast<double>(Result);
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}
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#ifndef _WIN32
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operator BIGFLOAT() const {
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#if BIGFLOATSIZE == 16
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const float128_t Result = extF80_to_f128(*this);
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return FEXCore::BitCast<BIGFLOAT>(Result);
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#else
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BIGFLOAT result{};
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memcpy(&result, this, sizeof(result));
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return result;
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#endif
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}
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#endif
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operator int16_t() const {
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auto rv = extF80_to_i32(*this, softfloat_roundingMode, false);
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if (rv > INT16_MAX) {
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return INT16_MAX;
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} else if (rv < INT16_MIN) {
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return INT16_MIN;
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} else {
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return rv;
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}
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}
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operator int32_t() const {
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return extF80_to_i32(*this, softfloat_roundingMode, false);
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}
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operator int64_t() const {
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return extF80_to_i64(*this, softfloat_roundingMode, false);
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}
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operator uint64_t() const {
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return extF80_to_ui64(*this, softfloat_roundingMode, false);
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}
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void operator=(const float rhs) {
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*this = f32_to_extF80(FEXCore::BitCast<float32_t>(rhs));
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}
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void operator=(const double rhs) {
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*this = f64_to_extF80(FEXCore::BitCast<float64_t>(rhs));
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}
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void operator=(const int16_t rhs) {
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*this = i32_to_extF80(rhs);
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}
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void operator=(const int32_t rhs) {
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*this = i32_to_extF80(rhs);
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}
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void operator=(const uint64_t rhs) {
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*this = ui64_to_extF80(rhs);
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}
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#if BIGFLOATSIZE == 10
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void operator=(const long double rhs) {
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memcpy(this, &rhs, sizeof(rhs));
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}
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#endif
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operator void*() {
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return reinterpret_cast<void*>(this);
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}
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X80SoftFloat(extFloat80_t rhs) {
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Significand = rhs.signif;
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Exponent = rhs.signExp & 0x7FFF;
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Sign = rhs.signExp >> 15;
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}
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X80SoftFloat(const float rhs) {
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*this = f32_to_extF80(FEXCore::BitCast<float32_t>(rhs));
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}
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X80SoftFloat(const double rhs) {
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*this = f64_to_extF80(FEXCore::BitCast<float64_t>(rhs));
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}
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#ifndef _WIN32
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X80SoftFloat(BIGFLOAT rhs) {
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#if BIGFLOATSIZE == 16
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*this = f128_to_extF80(FEXCore::BitCast<float128_t>(rhs));
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#else
|
|
*this = FEXCore::BitCast<long double>(rhs);
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
X80SoftFloat(const int16_t rhs) {
|
|
*this = i32_to_extF80(rhs);
|
|
}
|
|
|
|
X80SoftFloat(const int32_t rhs) {
|
|
*this = i32_to_extF80(rhs);
|
|
}
|
|
|
|
void operator=(extFloat80_t rhs) {
|
|
Significand = rhs.signif;
|
|
Exponent = rhs.signExp & 0x7FFF;
|
|
Sign = rhs.signExp >> 15;
|
|
}
|
|
|
|
operator extFloat80_t() const {
|
|
extFloat80_t Result{};
|
|
Result.signif = Significand;
|
|
Result.signExp = Exponent | (Sign << 15);
|
|
return Result;
|
|
}
|
|
|
|
static bool IsNan(X80SoftFloat const &lhs) {
|
|
return (lhs.Exponent == 0x7FFF) &&
|
|
(lhs.Significand & IntegerBit) &&
|
|
(lhs.Significand & Bottom62Significand);
|
|
}
|
|
|
|
static bool SignBit(X80SoftFloat const &lhs) {
|
|
return lhs.Sign;
|
|
}
|
|
|
|
private:
|
|
static constexpr uint64_t IntegerBit = (1ULL << 63);
|
|
static constexpr uint64_t Bottom62Significand = ((1ULL << 62) - 1);
|
|
static constexpr uint32_t ExponentBias = 16383;
|
|
};
|
|
|
|
#ifndef _WIN32
|
|
static_assert(sizeof(X80SoftFloat) == 10, "tword must be 10bytes in size");
|
|
#else
|
|
// Padding on this extends to 16-bytes rather than 10-bytes on WIN32.
|
|
static_assert(sizeof(X80SoftFloat) == 16, "tword must be 16bytes in size");
|
|
#endif
|