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cg87.c
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cg87.c
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// Copyright (C) 1987-1995 by Symantec
// Copyright (C) 2000-2013 by Digital Mars
// All Rights Reserved
// http://www.digitalmars.com
// Written by Walter Bright
/*
* This source file is made available for personal use
* only. The license is in backendlicense.txt
* For any other uses, please contact Digital Mars.
*/
#if !SPP
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <math.h>
#include "cc.h"
#include "el.h"
#include "oper.h"
#include "code.h"
#include "global.h"
static char __file__[] = __FILE__; /* for tassert.h */
#include "tassert.h"
// Constants that the 8087 supports directly
// BUG: rewrite for 80 bit long doubles
#define PI 3.14159265358979323846
#define LOG2 0.30102999566398119521
#define LN2 0.6931471805599453094172321
#define LOG2T 3.32192809488736234787
#define LOG2E 1.4426950408889634074 /* 1/LN2 */
#define FWAIT 0x9B /* FWAIT opcode */
/* Mark variable referenced by e as not a register candidate */
#define notreg(e) ((e)->EV.sp.Vsym->Sflags &= ~GTregcand)
/* Generate the appropriate ESC instruction */
#define ESC(MF,b) (0xD8 + ((MF) << 1) + (b))
enum MF
{ // Values for MF
MFfloat = 0,
MFlong = 1,
MFdouble = 2,
MFword = 3
};
NDP _8087elems[8]; // 8087 stack
NDP ndp_zero;
int stackused = 0; /* number of items on the 8087 stack */
/*********************************
*/
struct Dconst
{
int round;
symbol *roundto0;
symbol *roundtonearest;
};
static Dconst oldd;
#define NDPP 0 // print out debugging info
#define NOSAHF (I64 || config.fpxmmregs) // can't use SAHF instruction
code *loadComplex(elem *e);
code *opmod_complex87(elem *e,regm_t *pretregs);
code *opass_complex87(elem *e,regm_t *pretregs);
code * genf2(code *c,unsigned op,unsigned rm);
#define CW_roundto0 0xFBF
#define CW_roundtonearest 0x3BF
STATIC code *genrnd(code *c, short cw);
/**********************************
* When we need to temporarilly save 8087 registers, we record information
* about the save into an array of NDP structs:
*/
NDP *NDP::save = NULL;
int NDP::savemax = 0; /* # of entries in NDP::save[] */
int NDP::savetop = 0; /* # of entries used in NDP::save[] */
#ifdef DEBUG
#define NDPSAVEINC 2 /* flush reallocation bugs */
#else
#define NDPSAVEINC 8 /* allocation chunk sizes */
#endif
/****************************************
* Store/load to ndp save location i
*/
code *ndp_fstp(code *c, int i, tym_t ty)
{ unsigned grex = I64 ? (REX_W << 16) : 0;
switch (tybasic(ty))
{
case TYfloat:
case TYifloat:
case TYcfloat:
c = genc1(c,0xD9,grex | modregrm(2,3,BPRM),FLndp,i); // FSTP m32real i[BP]
break;
case TYdouble:
case TYdouble_alias:
case TYidouble:
case TYcdouble:
c = genc1(c,0xDD,grex | modregrm(2,3,BPRM),FLndp,i); // FSTP m64real i[BP]
break;
case TYldouble:
case TYildouble:
case TYcldouble:
c = genc1(c,0xDB,grex | modregrm(2,7,BPRM),FLndp,i); // FSTP m80real i[BP]
break;
default:
assert(0);
}
return c;
}
code *ndp_fld(code *c, int i, tym_t ty)
{ unsigned grex = I64 ? (REX_W << 16) : 0;
switch (tybasic(ty))
{
case TYfloat:
case TYifloat:
case TYcfloat:
c = genc1(c,0xD9,grex | modregrm(2,0,BPRM),FLndp,i);
break;
case TYdouble:
case TYdouble_alias:
case TYidouble:
case TYcdouble:
c = genc1(c,0xDD,grex | modregrm(2,0,BPRM),FLndp,i);
break;
case TYldouble:
case TYildouble:
case TYcldouble:
c = genc1(c,0xDB,grex | modregrm(2,5,BPRM),FLndp,i); // FLD m80real i[BP]
break;
default:
assert(0);
}
return c;
}
/**************************
* Return index of empty slot in NDP::save[].
*/
STATIC int getemptyslot()
{ int i;
for (i = 0; i < NDP::savemax; i++)
if (NDP::save[i].e == NULL)
goto L1;
/* Out of room, reallocate NDP::save[] */
NDP::save = (NDP *)mem_realloc(NDP::save,
(NDP::savemax + NDPSAVEINC) * sizeof(*NDP::save));
/* clear out new portion of NDP::save[] */
memset(NDP::save + NDP::savemax,0,NDPSAVEINC * sizeof(*NDP::save));
i = NDP::savemax;
NDP::savemax += NDPSAVEINC;
L1: if (i >= NDP::savetop)
NDP::savetop = i + 1;
return i;
}
/*********************************
* Pop 8087 stack.
*/
#undef pop87
void pop87(
#ifdef DEBUG
int line, const char *file
#endif
)
#ifdef DEBUG
#define pop87() pop87(__LINE__,__FILE__)
#endif
{
int i;
#if NDPP
dbg_printf("pop87(%s(%d): stackused=%d)\n", file, line, stackused);
#endif
--stackused;
assert(stackused >= 0);
for (i = 0; i < arraysize(_8087elems) - 1; i++)
_8087elems[i] = _8087elems[i + 1];
/* end of stack is nothing */
_8087elems[arraysize(_8087elems) - 1] = ndp_zero;
}
/*******************************
* Push 8087 stack. Generate and return any code
* necessary to preserve anything that might run off the end of the stack.
*/
#undef push87
#ifdef DEBUG
code *push87(int line, const char *file);
code *push87() { return push87(__LINE__,__FILE__); }
#endif
code *push87(
#ifdef DEBUG
int line, const char *file
#endif
)
#ifdef DEBUG
#define push87() push87(__LINE__,__FILE__)
#endif
{
code *c;
int i;
c = CNIL;
// if we would lose the top register off of the stack
if (_8087elems[7].e != NULL)
{
i = getemptyslot();
NDP::save[i] = _8087elems[7];
c = genf2(c,0xD9,0xF6); // FDECSTP
c = genfwait(c);
c = ndp_fstp(c, i, _8087elems[7].e->Ety); // FSTP i[BP]
assert(stackused == 8);
if (NDPP) dbg_printf("push87() : overflow\n");
}
else
{
#ifdef DEBUG
if (NDPP) dbg_printf("push87(%s(%d): %d)\n", file, line, stackused);
#endif
stackused++;
assert(stackused <= 8);
}
// Shift the stack up
for (i = 7; i > 0; i--)
_8087elems[i] = _8087elems[i - 1];
_8087elems[0] = ndp_zero;
return c;
}
/*****************************
* Note elem e as being in ST(i) as being a value we want to keep.
*/
#ifdef DEBUG
void note87(elem *e, unsigned offset, int i, int linnum);
void note87(elem *e, unsigned offset, int i)
{
return note87(e, offset, i, 0);
}
void note87(elem *e, unsigned offset, int i, int linnum)
#define note87(e,offset,i) note87(e,offset,i,__LINE__)
#else
void note87(elem *e, unsigned offset, int i)
#endif
{
#if NDPP
printf("note87(e = %p.%d, i = %d, stackused = %d, line = %d)\n",e,offset,i,stackused,linnum);
#endif
#if 0 && DEBUG
if (_8087elems[i].e)
printf("_8087elems[%d].e = %p\n",i,_8087elems[i].e);
#endif
//if (i >= stackused) *(char*)0=0;
assert(i < stackused);
while (e->Eoper == OPcomma)
e = e->E2;
_8087elems[i].e = e;
_8087elems[i].offset = offset;
}
/****************************************************
* Exchange two entries in 8087 stack.
*/
void xchg87(int i, int j)
{
NDP save;
save = _8087elems[i];
_8087elems[i] = _8087elems[j];
_8087elems[j] = save;
}
/****************************
* Make sure that elem e is in register ST(i). Reload it if necessary.
* Input:
* i 0..3 8087 register number
* flag 1 don't bother with FXCH
*/
#ifdef DEBUG
STATIC code * makesure87(elem *e,unsigned offset,int i,unsigned flag,int linnum)
#define makesure87(e,offset,i,flag) makesure87(e,offset,i,flag,__LINE__)
#else
STATIC code * makesure87(elem *e,unsigned offset,int i,unsigned flag)
#endif
{
#ifdef DEBUG
if (NDPP) printf("makesure87(e=%p, offset=%d, i=%d, flag=%d, line=%d)\n",e,offset,i,flag,linnum);
#endif
while (e->Eoper == OPcomma)
e = e->E2;
assert(e && i < 4);
code *c = CNIL;
L1:
if (_8087elems[i].e != e || _8087elems[i].offset != offset)
{
#ifdef DEBUG
if (_8087elems[i].e)
printf("_8087elems[%d].e = %p, .offset = %d\n",i,_8087elems[i].e,_8087elems[i].offset);
#endif
assert(_8087elems[i].e == NULL);
int j;
for (j = 0; 1; j++)
{
if (j >= NDP::savetop && e->Eoper == OPcomma)
{
e = e->E2; // try right side
goto L1;
}
#ifdef DEBUG
if (j >= NDP::savetop)
printf("e = %p, NDP::savetop = %d\n",e,NDP::savetop);
#endif
assert(j < NDP::savetop);
//printf("\tNDP::save[%d] = %p, .offset = %d\n", j, NDP::save[j].e, NDP::save[j].offset);
if (e == NDP::save[j].e && offset == NDP::save[j].offset)
break;
}
c = push87();
c = genfwait(c);
c = ndp_fld(c, j, e->Ety); // FLD j[BP]
if (!(flag & 1))
{
while (i != 0)
{
genf2(c,0xD9,0xC8 + i); // FXCH ST(i)
i--;
}
}
NDP::save[j] = ndp_zero; // back in 8087
}
//_8087elems[i].e = NULL;
return c;
}
/****************************
* Save in memory any values in the 8087 that we want to keep.
*/
code *save87()
{
code *c;
int i;
c = CNIL;
while (_8087elems[0].e && stackused)
{
/* Save it */
i = getemptyslot();
if (NDPP) printf("saving %p in temporary NDP::save[%d]\n",_8087elems[0].e,i);
NDP::save[i] = _8087elems[0];
c = genfwait(c);
c = ndp_fstp(c,i,_8087elems[0].e->Ety); // FSTP i[BP]
pop87();
}
if (c) /* if any stores */
genfwait(c); /* wait for last one to finish */
return c;
}
/******************************************
* Save any noted values that would be destroyed by n pushes
*/
code *save87regs(unsigned n)
{
unsigned j;
unsigned k;
code *c = NULL;
assert(n <= 7);
j = 8 - n;
if (stackused > j)
{
for (k = 8; k > j; k--)
{
c = genf2(c,0xD9,0xF6); // FDECSTP
c = genfwait(c);
if (k <= stackused)
{ int i;
i = getemptyslot();
c = ndp_fstp(c, i, _8087elems[k - 1].e->Ety); // FSTP i[BP]
NDP::save[i] = _8087elems[k - 1];
_8087elems[k - 1] = ndp_zero;
}
}
for (k = 8; k > j; k--)
{
if (k > stackused)
{ c = genf2(c,0xD9,0xF7); // FINCSTP
c = genfwait(c);
}
}
stackused = j;
}
return c;
}
/*****************************************************
* Save/restore ST0 or ST01
*/
void gensaverestore87(regm_t regm, code **csave, code **crestore)
{
//printf("gensaverestore87(%s)\n", regm_str(regm));
code *cs1 = *csave;
code *cs2 = *crestore;
assert(regm == mST0 || regm == mST01);
int i = getemptyslot();
NDP::save[i].e = el_calloc(); // this blocks slot [i] for the life of this function
cs1 = ndp_fstp(cs1, i, TYldouble);
cs2 = cat(ndp_fld(CNIL, i, TYldouble), cs2);
if (regm == mST01)
{
int j = getemptyslot();
NDP::save[j].e = el_calloc();
cs1 = ndp_fstp(cs1, j, TYldouble);
cs2 = cat(ndp_fld(CNIL, j, TYldouble), cs2);
}
*csave = cs1;
*crestore = cs2;
}
/*************************************
* Find which, if any, slot on stack holds elem e.
*/
STATIC int cse_get(elem *e, unsigned offset)
{ int i;
for (i = 0; 1; i++)
{
if (i == stackused)
{
i = -1;
//printf("cse not found\n");
//elem_print(e);
break;
}
if (_8087elems[i].e == e &&
_8087elems[i].offset == offset)
{ //printf("cse found %d\n",i);
//elem_print(e);
break;
}
}
return i;
}
/*************************************
* Reload common subexpression.
*/
code *comsub87(elem *e,regm_t *pretregs)
{ code *c;
//printf("comsub87(e = %p, *pretregs = %s)\n", e, regm_str(*pretregs));
// Look on 8087 stack
int i = cse_get(e, 0);
if (tycomplex(e->Ety))
{
unsigned sz = tysize(e->Ety);
int j = cse_get(e, sz / 2);
if (i >= 0 && j >= 0)
{
c = push87();
c = cat(c, push87());
c = genf2(c,0xD9,0xC0 + i); // FLD ST(i)
c = genf2(c,0xD9,0xC0 + j + 1); // FLD ST(j + 1)
c = cat(c,fixresult_complex87(e,mST01,pretregs));
}
else
// Reload
c = loaddata(e,pretregs);
}
else
{
if (i >= 0)
{
c = push87();
c = genf2(c,0xD9,0xC0 + i); // FLD ST(i)
if (*pretregs & XMMREGS)
c = cat(c,fixresult87(e,mST0,pretregs));
else
c = cat(c,fixresult(e,mST0,pretregs));
}
else
// Reload
c = loaddata(e,pretregs);
}
freenode(e);
return c;
}
/**************************
* Generate code to deal with floatreg.
*/
code * genfltreg(code *c,unsigned opcode,unsigned reg,targ_size_t offset)
{
floatreg = TRUE;
reflocal = TRUE;
if ((opcode & ~7) == 0xD8)
c = genfwait(c);
return genc1(c,opcode,modregxrm(2,reg,BPRM),FLfltreg,offset);
}
/*******************************
* Decide if we need to gen an FWAIT.
*/
code *genfwait(code *c)
{
if (ADDFWAIT())
c = gen1(c,FWAIT);
return c;
}
/***************************************
* Generate floating point instruction.
*/
code * genf2(code *c,unsigned op,unsigned rm)
{
return gen2(genfwait(c),op,rm);
}
/***************************
* Put the 8087 flags into the CPU flags.
*/
STATIC code * cg87_87topsw(code *c)
{
/* Note that SAHF is not available on some early I64 processors
* and will cause a seg fault
*/
assert(!NOSAHF);
c = cat(c,getregs(mAX));
if (config.target_cpu >= TARGET_80286)
c = genf2(c,0xDF,0xE0); // FSTSW AX
else
{ c = genfltreg(c,0xD8+5,7,0); /* FSTSW floatreg[BP] */
genfwait(c); /* FWAIT */
genfltreg(c,0x8A,4,1); /* MOV AH,floatreg+1[BP] */
}
gen1(c,0x9E); // SAHF
code_orflag(c,CFpsw);
return c;
}
/*****************************************
* Jump to ctarget if condition code C2 is set.
*/
STATIC code *genjmpifC2(code *c, code *ctarget)
{
if (NOSAHF)
{
c = cat(c,getregs(mAX));
c = genf2(c,0xDF,0xE0); // FSTSW AX
genc2(c,0xF6,modregrm(3,0,4),4); // TEST AH,4
c = genjmp(c, JNE, FLcode, (block *)ctarget); // JNE ctarget
}
else
{
c = cg87_87topsw(c);
c = genjmp(c, JP, FLcode, (block *)ctarget); // JP ctarget
}
return c;
}
/***************************
* Set the PSW based on the state of ST0.
* Input:
* pop if stack should be popped after test
* Returns:
* start of code appended to c.
*/
STATIC code * genftst(code *c,elem *e,int pop)
{
if (NOSAHF)
{
c = cat(c,push87());
c = gen2(c,0xD9,0xEE); // FLDZ
gen2(c,0xDF,0xE9); // FUCOMIP ST1
pop87();
if (pop)
{ c = genf2(c,0xDD,modregrm(3,3,0)); // FPOP
pop87();
}
}
else if (config.flags4 & CFG4fastfloat) // if fast floating point
{
c = genf2(c,0xD9,0xE4); // FTST
c = cg87_87topsw(c); // put 8087 flags in CPU flags
if (pop)
{ c = genf2(c,0xDD,modregrm(3,3,0)); // FPOP
pop87();
}
}
else if (config.target_cpu >= TARGET_80386)
{
// FUCOMP doesn't raise exceptions on QNANs, unlike FTST
c = cat(c,push87());
c = gen2(c,0xD9,0xEE); // FLDZ
gen2(c,pop ? 0xDA : 0xDD,0xE9); // FUCOMPP / FUCOMP
pop87();
if (pop)
pop87();
cg87_87topsw(c); // put 8087 flags in CPU flags
}
else
{
// Call library function which does not raise exceptions
regm_t regm = 0;
c = cat(c,callclib(e,CLIBftest,®m,0));
if (pop)
{ c = genf2(c,0xDD,modregrm(3,3,0)); // FPOP
pop87();
}
}
return c;
}
/*************************************
* Determine if there is a special 8087 instruction to load
* constant e.
* Input:
* im 0 load real part
* 1 load imaginary part
* Returns:
* opcode if found
* 0 if not
*/
unsigned char loadconst(elem *e, int im)
#if __DMC__
__in
{
elem_debug(e);
assert(im == 0 || im == 1);
}
__body
#endif
{
static float fval[7] =
{0.0,1.0,PI,LOG2T,LOG2E,LOG2,LN2};
static double dval[7] =
{0.0,1.0,PI,LOG2T,LOG2E,LOG2,LN2};
static longdouble ldval[7] =
#if __DMC__ // from math.h
{0.0,1.0,M_PI_L,M_LOG2T_L,M_LOG2E_L,M_LOG2_L,M_LN2_L};
#elif _MSC_VER // struct longdouble constants
{ld_zero, ld_one, ld_pi, ld_log2t, ld_log2e, ld_log2, ld_ln2};
#else // C99 hexadecimal floats (GCC, CLANG, ...)
#define M_PI_L 0x1.921fb54442d1846ap+1L // 3.14159 fldpi
#define M_LOG2T_L 0x1.a934f0979a3715fcp+1L // 3.32193 fldl2t
#define M_LOG2E_L 0x1.71547652b82fe178p+0L // 1.4427 fldl2e
#define M_LOG2_L 0x1.34413509f79fef32p-2L // 0.30103 fldlg2
#define M_LN2_L 0x1.62e42fefa39ef358p-1L // 0.693147 fldln2
{0.0,1.0,M_PI_L,M_LOG2T_L,M_LOG2E_L,M_LOG2_L,M_LN2_L};
#endif
static char opcode[7 + 1] =
/* FLDZ,FLD1,FLDPI,FLDL2T,FLDL2E,FLDLG2,FLDLN2,0 */
{0xEE,0xE8,0xEB,0xE9,0xEA,0xEC,0xED,0};
int i;
targ_float f;
targ_double d;
targ_ldouble ld;
int sz;
int zero;
void *p;
static char zeros[sizeof(longdouble)];
if (im == 0)
{
switch (tybasic(e->Ety))
{
case TYfloat:
case TYifloat:
case TYcfloat:
f = e->EV.Vfloat;
sz = 4;
p = &f;
break;
case TYdouble:
case TYdouble_alias:
case TYidouble:
case TYcdouble:
d = e->EV.Vdouble;
sz = 8;
p = &d;
break;
case TYldouble:
case TYildouble:
case TYcldouble:
ld = e->EV.Vldouble;
sz = 10;
p = &ld;
break;
default:
assert(0);
}
}
else
{
switch (tybasic(e->Ety))
{
case TYcfloat:
f = e->EV.Vcfloat.im;
sz = 4;
p = &f;
break;
case TYcdouble:
d = e->EV.Vcdouble.im;
sz = 8;
p = &d;
break;
case TYcldouble:
ld = e->EV.Vcldouble.im;
sz = 10;
p = &ld;
break;
default:
assert(0);
}
}
// Note that for this purpose, -0 is not regarded as +0,
// since FLDZ loads a +0
zero = (memcmp(p, zeros, sz) == 0);
if (zero && config.target_cpu >= TARGET_PentiumPro)
return 0xEE; // FLDZ is the only one with 1 micro-op
// For some reason, these instructions take more clocks
if (config.flags4 & CFG4speed && config.target_cpu >= TARGET_Pentium)
return 0;
if (zero)
return 0xEE;
for (i = 1; i < arraysize(fval); i++)
{
switch (sz)
{
case 4:
if (fval[i] != f)
continue;
break;
case 8:
if (dval[i] != d)
continue;
break;
case 10:
if (ldval[i] != ld)
continue;
break;
default:
assert(0);
}
break;
}
return opcode[i];
}
/******************************
* Given the result of an expression is in retregs,
* generate necessary code to return result in *pretregs.
*/
code *fixresult87(elem *e,regm_t retregs,regm_t *pretregs)
{
regm_t regm;
tym_t tym;
code *c1,*c2;
unsigned sz;
//printf("fixresult87(e = %p, retregs = x%x, *pretregs = x%x)\n", e,retregs,*pretregs);
//printf("fixresult87(e = %p, retregs = %s, *pretregs = %s)\n", e,regm_str(retregs),regm_str(*pretregs));
assert(!*pretregs || retregs);
c1 = CNIL;
c2 = CNIL;
tym = tybasic(e->Ety);
sz = tysize[tym];
//printf("tym = x%x, sz = %d\n", tym, sz);
if (*pretregs & mST01)
return fixresult_complex87(e, retregs, pretregs);
/* if retregs needs to be transferred into the 8087 */
if (*pretregs & mST0 && retregs & (mBP | ALLREGS))
{
assert(sz <= DOUBLESIZE);
if (!I16)
{
if (*pretregs & mPSW)
{ // Set flags
regm_t r = retregs | mPSW;
c1 = fixresult(e,retregs,&r);
}
c2 = push87();
if (sz == REGSIZE || (I64 && sz == 4))
{
unsigned reg = findreg(retregs);
c2 = genfltreg(c2,0x89,reg,0); // MOV fltreg,reg
genfltreg(c2,0xD9,0,0); // FLD float ptr fltreg
}
else
{ unsigned msreg,lsreg;
msreg = findregmsw(retregs);
lsreg = findreglsw(retregs);
c2 = genfltreg(c2,0x89,lsreg,0); // MOV fltreg,lsreg
genfltreg(c2,0x89,msreg,4); // MOV fltreg+4,msreg
genfltreg(c2,0xDD,0,0); // FLD double ptr fltreg
}
}
else
{
regm = (sz == FLOATSIZE) ? FLOATREGS : DOUBLEREGS;
regm |= *pretregs & mPSW;
c1 = fixresult(e,retregs,®m);
regm = 0; // don't worry about result from CLIBxxx
c2 = callclib(e,
((sz == FLOATSIZE) ? CLIBfltto87 : CLIBdblto87),
®m,0);
}
}
else if (*pretregs & (mBP | ALLREGS) && retregs & mST0)
{ unsigned mf;
unsigned reg;
assert(sz <= DOUBLESIZE);
mf = (sz == FLOATSIZE) ? MFfloat : MFdouble;
if (*pretregs & mPSW && !(retregs & mPSW))
c1 = genftst(c1,e,0);
/* FSTP floatreg */
pop87();
c1 = genfltreg(c1,ESC(mf,1),3,0);
genfwait(c1);
c2 = allocreg(pretregs,®,(sz == FLOATSIZE) ? TYfloat : TYdouble);
if (sz == FLOATSIZE)
{
if (!I16)
c2 = genfltreg(c2,0x8B,reg,0);
else
{ c2 = genfltreg(c2,0x8B,reg,REGSIZE);
genfltreg(c2,0x8B,findreglsw(*pretregs),0);
}
}
else
{ assert(sz == DOUBLESIZE);
if (I16)
{ c2 = genfltreg(c2,0x8B,AX,6);
genfltreg(c2,0x8B,BX,4);
genfltreg(c2,0x8B,CX,2);
genfltreg(c2,0x8B,DX,0);
}
else if (I32)
{ c2 = genfltreg(c2,0x8B,reg,REGSIZE);
genfltreg(c2,0x8B,findreglsw(*pretregs),0);
}
else // I64
{
c2 = genfltreg(c2,0x8B,reg,0);
code_orrex(c2, REX_W);
}
}
}
else if (*pretregs == 0 && retregs == mST0)
{
c1 = genf2(c1,0xDD,modregrm(3,3,0)); // FPOP
pop87();
}
else
{ if (*pretregs & mPSW)
{ if (!(retregs & mPSW))
{
c1 = genftst(c1,e,!(*pretregs & (mST0 | XMMREGS))); // FTST
}
}
if (*pretregs & mST0 && retregs & XMMREGS)
{
assert(sz <= DOUBLESIZE);
unsigned mf = (sz == FLOATSIZE) ? MFfloat : MFdouble;
// MOVD floatreg,XMM?
unsigned reg = findreg(retregs);
c1 = genfltreg(c1,xmmstore(tym),reg - XMM0,0);
c2 = push87();
c2 = genfltreg(c2,ESC(mf,1),0,0); // FLD float/double ptr fltreg
}
else if (retregs & mST0 && *pretregs & XMMREGS)
{
assert(sz <= DOUBLESIZE);
unsigned mf = (sz == FLOATSIZE) ? MFfloat : MFdouble;
// FSTP floatreg
pop87();
c1 = genfltreg(c1,ESC(mf,1),3,0);
genfwait(c1);
// MOVD XMM?,floatreg
unsigned reg;
c2 = allocreg(pretregs,®,(sz == FLOATSIZE) ? TYfloat : TYdouble);
c2 = genfltreg(c2,xmmload(tym),reg -XMM0,0);
}
else
assert(!(*pretregs & mST0) || (retregs & mST0));
}
if (*pretregs & mST0)
note87(e,0,0);
return cat(c1,c2);
}
/********************************
* Generate in-line 8087 code for the following operators:
* add
* min
* mul
* div
* cmp
*/
// Reverse the order that the op is done in
static const char oprev[9] = { -1,0,1,2,3,5,4,7,6 };
code *orth87(elem *e,regm_t *pretregs)
{
unsigned op;
code *c1,*c2,*c3,*c4;
code *cx;
regm_t retregs;
regm_t resregm;
elem *e1;
elem *e2;
int e2oper;
int eoper;
unsigned sz2;
int clib = CLIBMAX; // initialize to invalid value
int reverse = 0;
//printf("orth87(+e = %p, *pretregs = %s)\n", e, regm_str(*pretregs));
#if 1 // we could be evaluating / for side effects only
assert(*pretregs != 0);
#endif
retregs = mST0;
resregm = mST0;
e1 = e->E1;
e2 = e->E2;
c3 = CNIL;
c4 = CNIL;
sz2 = tysize(e1->Ety);
if (tycomplex(e1->Ety))
sz2 /= 2;