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commit 13b5c532e1b72b7d3737c451a519af749d25c61f
Author: Kelvin Sherlock <ksherlock@gmail.com>
Date:   Tue Jan 6 17:46:00 2015 -0500

    add fclassify sane ops.

commit 374aa6cc90218d8f86843cf5eecbf3095fe59a5e
Author: Kelvin Sherlock <ksherlock@gmail.com>
Date:   Tue Jan 6 16:55:16 2015 -0500

    proc entry / proc exit stubs and updated environment documentation
This commit is contained in:
Kelvin Sherlock 2015-01-06 17:46:24 -05:00
parent 2bb2bd4326
commit 45c89042ee
1 changed files with 193 additions and 5 deletions
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198
toolbox/sane.cpp
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@ -48,8 +48,55 @@ using std::to_string;
namespace {
// default environment is:
// rounding direction: to nearest
// rounding precision: extended
// exception flags: clear
// halts: clear
/*
* Environment: x d d e e e e e x p p h h h h h
* x - reserved
* d d - rounding direction
* e - exception flags
* p - rounding precision
* h - halt flags
*/
enum {
kExceptionInexact = 1 << 12,
kExceptionDivideByZero = 1 << 11,
kExceptionOverflow = 1 << 10,
kExceptionUnderflow = 1 << 9,
kExceptionInvalid = 1 << 8,
kHaltInexact = 1 << 4,
kHaltDivideByZero = 1 << 3,
kHaltOverflow = 1 << 2,
kHaltUnderflow = 1 << 1,
kHaltInvalid = 1 << 0,
kRoundingDirectionMask = 0x6000,
kRoundingDirectionToNearest = 0x0000,
kRoundingDirectionUpward = 0x2000,
kRoundingDirectionDownward = 0x4000,
kRoundingDirectionTowardZero = 0x6000,
kRoundingPrecisionMask = 0x0060,
kRoundingPrecisionExtended = 0x0000,
kRoundingPrecisionDouble = 0x0020,
kRoundingPrecisionSingle = 0x0040,
kRoundingPrecisionUndefined = 0x0060,
};
const uint16_t DefaultEnvironment = 0;
uint16_t Environment = DefaultEnvironment;
uint16_t Environment = 0;
}
// long double is an 80-bit extended with an extra 48-bits of 0 padding.
@ -672,8 +719,113 @@ using std::to_string;
return 0;
}
inline int classify(float x) { return fpclassify(x); }
inline int classify(double x) { return fpclassify(x); }
inline int classify(extended x) { return fpclassify(x); }
inline int classify(complex c) {
if (c.isnan()) return FP_NAN;
if ((uint64_t)c == (uint64_t)0) return FP_ZERO;
return FP_NORMAL;
}
inline int sign(float x) { return signbit(x); }
inline int sign(double x) { return signbit(x); }
inline int sign(extended x) { return signbit(x); }
inline int sign(complex c) {
if (c.isnan()) return 0;
return ((int64_t)c < (int64_t)0) ? 1 : 0;
}
template <class SrcType>
uint16_t fclassify(const char *name)
{
/*
* The classify operations set the sign of the destination to
* the sign of the source and the value of the destination
* according to the class of the source, as shown in Table E-18.
* The destination is an integer variable. (pg 273)
*
*
* Table E-18
* Class Information
* ----------------------
* Class of SRC Value
* ----------------------
* Signaling NaN 1
* Quiet NaN 2
* Infinity 3
* Zero 4
* Normalized 5
* Denormalized 6
*
* Table E-19
* ---------------------------
* Sign of SRC Sign of DST
* ---------------------------
* Positive Positive
* Negative Negative
*/
// N.B. - Sane.h uses 0-5, but how can you have integer -0?
uint16_t op;
uint32_t dest;
uint32_t src;
StackFrame<10>(src, dest, op);
Log(" %s(%08x, %08x, %04x)\n", name, src, dest, op);
SrcType s = readnum<SrcType>(src);
if (ToolBox::Trace)
{
std::string tmp1 = to_string(s);
Log(" %s\n", tmp1.c_str());
}
int16_t klass = 0;
switch(classify(s))
{
case FP_INFINITE:
klass = 3;
break;
case FP_NAN:
// todo -- signaling NaN is indicated
// by the MSB of the fraction field f
// 1 is quiet, 0 is signaling.
klass = 1;
break;
case FP_NORMAL:
klass = 5;
break;
case FP_SUBNORMAL:
klass = 6;
break;
case FP_ZERO:
klass = 4;
break;
}
if (sign(s)) klass = -klass;
if (dest) {
memoryWriteWord(klass, dest);
}
return 0;
}
#pragma mark - environment
/*
* environment is a uint16_t *.
* void setenvironment(environment e);
* void getenvironment(environment *e);
* void procentry(environment *e);
* void procexit(environment e);
*/
uint16_t fgetenv(void)
{
uint32_t address;
@ -686,23 +838,52 @@ using std::to_string;
return 0;
}
uint16_t fsetenv(void)
{
uint32_t address;
uint16_t value;
uint16_t op;
StackFrame<6>(address, op);
value = address ? memoryReadWord(address) : DefaultEnvironment;
Log(" FSETENV(%08x (%04x))\n", address, value);
Environment = value;
return 0;
}
uint16_t fprocentry(void)
{
uint32_t address;
uint16_t op;
StackFrame<6>(address, op);
Log(" FPROCENTRY(%08x)\n", address);
if (address) memoryWriteWord(Environment, address);
Environment = DefaultEnvironment;
return 0;
}
uint16_t fprocexit(void)
{
uint32_t address;
uint16_t value;
uint16_t op;
StackFrame<6>(address, op);
value = memoryReadWord(address);
Log(" FSETENV(%08x (%04x))\n", address, value);
value = address ? memoryReadWord(address) : DefaultEnvironment;
Log(" FPROCEXIT(%08x (%04x))\n", address, value);
// todo -- also should signal exceptions/halts at this point.
Environment = value;
return 0;
}
extern "C" void cpuSetFlagsAbs(UWO f);
uint16_t fp68k(uint16_t trap)
{
@ -785,12 +966,19 @@ using std::to_string;
case 0x280e: return fconvert<int32_t, extended>("FL2X");
case 0x001c: return fclassify<extended>("FCLASSX");
case 0x081c: return fclassify<double>("FCLASSD");
case 0x101c: return fclassify<float>("FCLASSS");
case 0x301c: return fclassify<complex>("FCLASSC");
case 0x0009:
// fdec2x
return fdecimal<extended>("FDEC2X");
break;
case 0x0017: return fprocentry();
case 0x0019: return fprocexit();
case 0x0003: return fgetenv();
case 0x0001: return fsetenv();
}