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cgelem.c
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cgelem.c
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// Copyright (C) 1985-1998 by Symantec
// Copyright (C) 2000-2011 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 /dmd/src/dmd/backendlicense.txt
* or /dm/src/dmd/backendlicense.txt
* For any other uses, please contact Digital Mars.
*/
#if !SPP
#include <stdio.h>
#include <string.h>
#include <time.h>
#include "cc.h"
#include "oper.h"
#include "global.h"
#include "el.h"
#include "dt.h"
#include "code.h"
#include "type.h"
static char __file__[] = __FILE__; /* for tassert.h */
#include "tassert.h"
extern void error(const char *filename, unsigned linnum, const char *format, ...);
STATIC elem * optelem(elem *,HINT);
STATIC elem * elarray(elem *e);
STATIC elem * eldiv(elem *);
CEXTERN elem * evalu8(elem *);
static int expgoal;
static int again;
static int cgelem_goal;
/*****************************
*/
STATIC elem * cgel_lvalue(elem *e)
{ elem *e1;
elem *e11;
int op;
//printf("cgel_lvalue()\n"); elem_print(e);
e1 = e->E1;
op = e->Eoper;
if (e1->Eoper == OPbit)
{
e11 = e1->E1;
if (e11->Eoper == OPcomma)
{
// Replace (((e,v) bit x) op e2) with (e,((v bit x) op e2))
e1->E1 = e11->E2;
e11->E2 = e;
e11->Ety = e->Ety;
e11->ET = e->ET;
e = e11;
goto L1;
}
else if (OTassign(e11->Eoper))
{
// Replace (((e op= v) bit x) op e2) with ((e op= v) , ((e bit x) op e2))
e1->E1 = el_copytree(e11->E1);
e = el_bin(OPcomma,e->Ety,e11,e);
goto L1;
}
}
else if (e1->Eoper == OPcomma)
{
// Replace ((e,v) op e2) with (e,(v op e2))
e->Eoper = OPcomma;
e1->Eoper = op;
e1->Ety = e->Ety;
e1->ET = e->ET;
e->E1 = e1->E1;
e1->E1 = e1->E2;
e1->E2 = e->E2;
e->E2 = e1;
goto L1;
}
else if (OTassign(e1->Eoper))
{
// Replace ((e op= v) op e2) with ((e op= v) , (e op e2))
e->E1 = el_copytree(e1->E1);
e = el_bin(OPcomma,e->Ety,e1,e);
L1:
e = optelem(e,TRUE);
}
return e;
}
/******************************
* Scan down commas.
*/
STATIC elem * elscancommas(elem *e)
{
while (e->Eoper == OPcomma
#if SCPP
|| e->Eoper == OPinfo
#endif
)
e = e->E2;
return e;
}
/*************************
* Return TRUE if elem is the constant 1.
*/
int elemisone(elem *e)
{
if (e->Eoper == OPconst)
{ switch (tybasic(e->Ety))
{
case TYchar:
case TYuchar:
case TYschar:
case TYchar16:
case TYshort:
case TYushort:
case TYint:
case TYuint:
case TYlong:
case TYulong:
case TYllong:
case TYullong:
case TYnullptr:
#if JHANDLE
case TYjhandle:
#endif
#if TARGET_SEGMENTED
case TYsptr:
case TYcptr:
case TYhptr:
case TYfptr:
case TYvptr:
#endif
case TYnptr:
case TYbool:
case TYwchar_t:
case TYdchar:
if (el_tolong(e) != 1)
goto nomatch;
break;
case TYldouble:
case TYildouble:
if (e->EV.Vldouble != 1)
goto nomatch;
break;
case TYdouble:
case TYidouble:
case TYdouble_alias:
if (e->EV.Vdouble != 1)
goto nomatch;
break;
case TYfloat:
case TYifloat:
if (e->EV.Vfloat != 1)
goto nomatch;
break;
default:
goto nomatch;
}
return TRUE;
}
nomatch:
return FALSE;
}
/*************************
* Return TRUE if elem is the constant -1.
*/
int elemisnegone(elem *e)
{
if (e->Eoper == OPconst)
{ switch (tybasic(e->Ety))
{
case TYchar:
case TYuchar:
case TYschar:
case TYchar16:
case TYshort:
case TYushort:
case TYint:
case TYuint:
case TYlong:
case TYulong:
case TYllong:
case TYullong:
case TYnullptr:
case TYnptr:
#if JHANDLE
case TYjhandle:
#endif
#if TARGET_SEGMENTED
case TYsptr:
case TYcptr:
case TYhptr:
case TYfptr:
case TYvptr:
#endif
case TYbool:
case TYwchar_t:
case TYdchar:
if (el_tolong(e) != -1)
goto nomatch;
break;
case TYldouble:
//case TYildouble:
if (e->EV.Vldouble != -1)
goto nomatch;
break;
case TYdouble:
//case TYidouble:
case TYdouble_alias:
if (e->EV.Vdouble != -1)
goto nomatch;
break;
case TYfloat:
//case TYifloat:
if (e->EV.Vfloat != -1)
goto nomatch;
break;
default:
goto nomatch;
}
return TRUE;
}
nomatch:
return FALSE;
}
/**********************************
* Swap relational operators (like if we swapped the leaves).
*/
unsigned swaprel(unsigned op)
{
assert(op < (unsigned) OPMAX);
if (OTrel(op))
op = rel_swap(op);
return op;
}
/**************************
* Replace e1 by t=e1, replace e2 by t.
*/
STATIC void fixside(elem **pe1,elem **pe2)
{ tym_t tym;
elem *tmp,*e2;
tym = (*pe1)->Ety;
tmp = el_alloctmp(tym);
*pe1 = el_bin(OPeq,tym,tmp,*pe1);
e2 = el_copytree(tmp);
el_free(*pe2);
*pe2 = e2;
}
/****************************
* Compute the 'cost' of evaluating a elem. Could be done
* as Sethi-Ullman numbers, but that ain't worth the bother.
* We'll fake it.
*/
#define cost(n) (opcost[n->Eoper])
/*******************************
* For floating point expressions, the cost would be the number
* of registers in the FPU stack needed.
*/
int fcost(elem *e)
{
int cost;
int cost1;
int cost2;
//printf("fcost()\n");
switch (e->Eoper)
{
case OPadd:
case OPmin:
case OPmul:
case OPdiv:
cost1 = fcost(e->E1);
cost2 = fcost(e->E2);
cost = cost2 + 1;
if (cost1 > cost)
cost = cost1;
break;
case OPcall:
case OPucall:
cost = 8;
break;
case OPneg:
case OPabs:
return fcost(e->E1);
case OPvar:
case OPconst:
case OPind:
default:
return 1;
}
if (cost > 8)
cost = 8;
return cost;
}
/*******************************
* The lvalue of an op= is a conversion operator. Since the code
* generator cannot handle this, we will have to fix it here. The
* general strategy is:
* (conv) e1 op= e2 => e1 = (conv) e1 op e2
* Since e1 can only be evaluated once, if it is an expression we
* must use a temporary.
*/
STATIC elem *fixconvop(elem *e)
{ elem *e1,*e2,*ed,*T;
elem *ex;
elem **pe;
unsigned cop,icop,op;
tym_t tycop,tym,tyme;
static unsigned char invconvtab[] =
{
OPbool, // OPb_8
OPs32_d, // OPd_s32
OPd_s32, // OPs32_d
OPs16_d, /* OPd_s16 */
OPd_s16, /* OPs16_d */
OPu16_d, // OPd_u16
OPd_u16, // OPu16_d
OPu32_d, /* OPd_u32 */
OPd_u32, /* OPu32_d */
OPs64_d, // OPd_s64
OPd_s64, // OPs64_d
OPu64_d, // OPd_u64
OPd_u64, // OPu64_d
OPf_d, // OPd_f
OPd_f, // OPf_d
OP32_16, // OPs16_32
OP32_16, // OPu16_32
OPs16_32, // OP32_16
OP16_8, // OPu8_16
OP16_8, // OPs8_16
OPs8_16, // OP16_8
OP64_32, // OPu32_64
OP64_32, // OPs32_64
OPs32_64, // OP64_32
OP128_64, // OPu64_128
OP128_64, // OPs64_128
OPs64_128, // OP128_64
#if TARGET_SEGMENTED
0, /* OPvp_fp */
0, /* OPcvp_fp */
OPnp_fp, /* OPoffset */
OPoffset, /* OPnp_fp */
OPf16p_np, /* OPnp_f16p */
OPnp_f16p, /* OPf16p_np */
#endif
OPd_ld, // OPld_d
OPld_d, // OPd_ld
OPu64_d, // OPld_u64
};
//dbg_printf("fixconvop before\n");
//elem_print(e);
assert(arraysize(invconvtab) == CNVOPMAX - CNVOPMIN + 1);
assert(e);
tyme = e->Ety;
cop = e->E1->Eoper; /* the conversion operator */
assert(cop <= CNVOPMAX);
if (e->E1->E1->Eoper == OPcomma)
{ /* conv(a,b) op= e2
* =>
* a, (conv(b) op= e2)
*/
elem *ecomma = e->E1->E1;
e->E1->E1 = ecomma->E2;
e->E1->E1->Ety = ecomma->Ety;
ecomma->E2 = e;
ecomma->Ety = e->Ety;
return optelem(ecomma, TRUE);
}
tycop = e->E1->Ety;
tym = e->E1->E1->Ety;
e->E1 = el_selecte1(e->E1); /* dump it for now */
e1 = e->E1;
e1->Ety = tym;
e2 = e->E2;
assert(e1 && e2);
/* select inverse conversion operator */
icop = invconvtab[convidx(cop)];
/* First, let's see if we can just throw it away. */
/* (unslng or shtlng) e op= e2 => e op= (lngsht) e2 */
if (OTwid(e->Eoper) &&
(cop == OPs16_32 || cop == OPu16_32 ||
cop == OPu8_16 || cop == OPs8_16))
{ if (e->Eoper != OPshlass && e->Eoper != OPshrass && e->Eoper != OPashrass)
e->E2 = el_una(icop,tym,e2);
//dbg_printf("after1\n");
//elem_print(e);
return e;
}
/* Oh well, just split up the op and the =. */
op = opeqtoop(e->Eoper); /* convert op= to op */
e->Eoper = OPeq; /* just plain = */
ed = el_copytree(e1); /* duplicate e1 */
/* make: e1 = (icop) ((cop) ed op e2)*/
e->E2 = el_una(icop,e1->Ety,
el_bin(op,tycop,el_una(cop,tycop,ed),
e2));
//printf("after1\n");
//elem_print(e);
if (op == OPdiv &&
tybasic(e2->Ety) == TYcdouble)
{
if (tycop == TYdouble)
{
e->E2->E1->Ety = tybasic(e2->Ety);
e->E2->E1 = el_una(OPc_r, tycop, e->E2->E1);
}
else if (tycop == TYidouble)
{
e->E2->E1->Ety = tybasic(e2->Ety);
e->E2->E1 = el_una(OPc_i, tycop, e->E2->E1);
}
}
if (op == OPdiv &&
tybasic(e2->Ety) == TYcfloat)
{
if (tycop == TYfloat)
{
e->E2->E1->Ety = tybasic(e2->Ety);
e->E2->E1 = el_una(OPc_r, tycop, e->E2->E1);
}
else if (tycop == TYifloat)
{
e->E2->E1->Ety = tybasic(e2->Ety);
e->E2->E1 = el_una(OPc_i, tycop, e->E2->E1);
}
}
/* Handle case of multiple conversion operators on lvalue */
/* (such as (intdbl 8int char += double)) */
ex = e;
pe = &e;
while (OTconv(ed->Eoper))
{ unsigned copx = ed->Eoper;
tym_t tymx;
icop = invconvtab[convidx(copx)];
tymx = ex->E1->E1->Ety;
ex->E1 = el_selecte1(ex->E1); // dump it for now
e1 = ex->E1;
e1->Ety = tymx;
ex->E2 = el_una(icop,e1->Ety,ex->E2);
ex->Ety = tymx;
tym = tymx;
if (ex->Ety != tyme)
{ *pe = el_una(copx, ed->Ety, ex);
pe = &(*pe)->E1;
}
ed = ed->E1;
}
//dbg_printf("after2\n");
//elem_print(e);
e->Ety = tym;
if (tym != tyme &&
!(tyintegral(tym) && tyintegral(tyme) && tysize(tym) == tysize(tyme)))
e = el_una(cop, tyme, e);
if (ed->Eoper == OPbit) /* special handling */
{
ed = ed->E1;
e1 = e1->E1; /* go down one */
}
/* If we have a *, must assign a temporary to the expression */
/* underneath it (even if it's a var, as e2 may modify the var). */
if (ed->Eoper == OPind)
{ T = el_alloctmp(ed->E1->Ety); /* make temporary */
ed->E1 = el_bin(OPeq,T->Ety,T,ed->E1); /* ed: *(T=e) */
el_free(e1->E1);
e1->E1 = el_copytree(T);
}
//dbg_printf("after3\n");
//elem_print(e);
return e;
}
STATIC elem * elerr(elem *e)
{
#ifdef DEBUG
elem_print(e);
#endif
assert(0);
return (elem *)NULL;
}
/* For ops with no optimizations */
STATIC elem * elzot(elem *e)
{ return e; }
/****************************
*/
STATIC elem * elstring(elem *e)
{
#if 0 // now handled by el_convert()
if (!OPTIMIZER)
el_convstring(e); // convert string to OPrelconst
#endif
return e;
}
/************************
*/
#if TARGET_SEGMENTED
/************************
* Convert far pointer to pointer.
*/
STATIC void eltonear(elem **pe)
{ tym_t ty;
elem *e = *pe;
ty = e->E1->Ety;
e = el_selecte1(e);
e->Ety = ty;
*pe = optelem(e,TRUE);
}
#endif
/************************
*/
STATIC elem * elstrcpy(elem *e)
{ tym_t ty;
elem_debug(e);
switch (e->E2->Eoper)
{
#if TARGET_SEGMENTED
case OPnp_fp:
if (OPTIMIZER)
{
eltonear(&e->E2);
e = optelem(e,TRUE);
}
break;
#endif
case OPstring:
/* Replace strcpy(e1,"string") with memcpy(e1,"string",sizeof("string")) */
// As streq
e->Eoper = OPstreq;
type *t = type_allocn(TYarray, tschar);
t->Tdim = strlen(e->E2->EV.ss.Vstring) + 1;
e->ET = t;
t->Tcount++;
e->E1 = el_una(OPind,TYstruct,e->E1);
e->E2 = el_una(OPind,TYstruct,e->E2);
e = el_bin(OPcomma,e->Ety,e,el_copytree(e->E1->E1));
if (el_sideeffect(e->E2))
fixside(&e->E1->E1->E1,&e->E2);
e = optelem(e,TRUE);
break;
}
return e;
}
/************************
*/
STATIC elem * elstrcmp(elem *e)
{
elem_debug(e);
if (OPTIMIZER)
{
#if TARGET_SEGMENTED
if (e->E1->Eoper == OPnp_fp)
eltonear(&e->E1);
#endif
switch (e->E2->Eoper)
{
#if TARGET_SEGMENTED
case OPnp_fp:
eltonear(&e->E2);
break;
#endif
case OPstring:
// Replace strcmp(e1,"string") with memcmp(e1,"string",sizeof("string"))
e->Eoper = OPparam;
e = el_bin(OPmemcmp,e->Ety,e,el_long(TYint,strlen(e->E2->EV.ss.Vstring) + 1));
e = optelem(e,TRUE);
break;
}
}
return e;
}
/****************************
* For OPmemcmp, OPmemcpy, OPmemset.
*/
STATIC elem * elmemxxx(elem *e)
{
elem_debug(e);
if (OPTIMIZER)
{ elem *ex;
ex = e->E1;
switch (e->Eoper)
{ case OPmemcmp:
#if TARGET_SEGMENTED
if (ex->E1->Eoper == OPnp_fp)
eltonear(&ex->E1);
if (ex->E2->Eoper == OPnp_fp)
eltonear(&ex->E2);
#endif
break;
case OPmemset:
#if TARGET_SEGMENTED
if (ex->Eoper == OPnp_fp)
eltonear(&ex);
else
#endif
{
// lvalue OPmemset (nbytes param value)
elem *enbytes = e->E2->E1;
elem *evalue = e->E2->E2;
#if MARS
if (enbytes->Eoper == OPconst && evalue->Eoper == OPconst
/* && tybasic(e->E1->Ety) == TYstruct*/)
{ tym_t tym;
tym_t ety;
int nbytes = el_tolong(enbytes);
targ_llong value = el_tolong(evalue);
elem *e1 = e->E1;
elem *tmp;
if (e1->Eoper == OPcomma || OTassign(e1->Eoper))
return cgel_lvalue(e); // replace (e,v)op=e2 with e,(v op= e2)
switch (nbytes)
{
case CHARSIZE: tym = TYchar; goto L1;
case SHORTSIZE: tym = TYshort; goto L1;
case LONGSIZE: tym = TYlong; goto L1;
case LLONGSIZE: if (intsize == 2)
goto Ldefault;
tym = TYllong; goto L1;
L1:
ety = e->Ety;
memset(&value, value & 0xFF, sizeof(value));
evalue->EV.Vullong = value;
evalue->Ety = tym;
e->Eoper = OPeq;
e->Ety = (e->Ety & ~mTYbasic) | tym;
if (tybasic(e1->Ety) == TYstruct)
e1->Ety = tym;
else
e->E1 = el_una(OPind, tym, e1);
tmp = el_same(&e->E1);
tmp = el_una(OPaddr, ety, tmp);
e->E2->Ety = tym;
e->E2 = el_selecte2(e->E2);
e = el_combine(e, tmp);
e = optelem(e,TRUE);
break;
default:
Ldefault:
break;
}
}
#endif
}
break;
case OPmemcpy:
#if TARGET_SEGMENTED
if (ex->Eoper == OPnp_fp)
eltonear(&e->E1);
#endif
ex = e->E2;
#if TARGET_SEGMENTED
if (ex->E1->Eoper == OPnp_fp)
eltonear(&ex->E1);
#endif
if (ex->E2->Eoper == OPconst)
{
if (!boolres(ex->E2))
{ // Copying 0 bytes, so remove memcpy
e->E2 = e->E1;
e->E1 = ex->E1;
ex->E1 = NULL;
e->Eoper = OPcomma;
el_free(ex);
return optelem(e, TRUE);
}
// Convert OPmemcpy to OPstreq
e->Eoper = OPstreq;
type *t = type_allocn(TYarray, tschar);
t->Tdim = el_tolong(ex->E2);
e->ET = t;
t->Tcount++;
e->E1 = el_una(OPind,TYstruct,e->E1);
e->E2 = el_una(OPind,TYstruct,ex->E1);
ex->E1 = NULL;
el_free(ex);
ex = el_copytree(e->E1->E1);
#if TARGET_SEGMENTED
if (tysize(e->Ety) > tysize(ex->Ety))
ex = el_una(OPnp_fp,e->Ety,ex);
#endif
e = el_bin(OPcomma,e->Ety,e,ex);
if (el_sideeffect(e->E2))
fixside(&e->E1->E1->E1,&e->E2);
return optelem(e,TRUE);
}
break;
default:
assert(0);
}
}
return e;
}
/***********************
* + # (combine offsets with addresses)
* / \ => |
* # c v,c
* |
* v
*/
STATIC elem * eladd(elem *e)
{ elem *e1,*e2;
int sz;
//printf("eladd(%p)\n",e);
targ_size_t ptrmask = ~(targ_size_t)0;
if (NPTRSIZE <= 4)
ptrmask = 0xFFFFFFFF;
L1:
e1 = e->E1;
e2 = e->E2;
if (e2->Eoper == OPconst)
{
#if TARGET_LINUX || TARGET_OSX || TARGET_FREEBSD || TARGET_OPENBSD || TARGET_SOLARIS
if (e1->Eoper == OPrelconst && e1->EV.sp.Vsym->Sfl == FLgot)
goto ret;
#endif
if (e1->Eoper == OPrelconst /* if (&v) + c */
|| e1->Eoper == OPstring
)
{
e1->EV.sp.Voffset += e2->EV.Vpointer;
e1->EV.sp.Voffset &= ptrmask;
e = el_selecte1(e);
goto ret;
}
}
else if (e1->Eoper == OPconst)
{
#if TARGET_LINUX || TARGET_OSX || TARGET_FREEBSD || TARGET_OPENBSD || TARGET_SOLARIS
if (e2->Eoper == OPrelconst && e2->EV.sp.Vsym->Sfl == FLgot)
goto ret;
#endif
if (e2->Eoper == OPrelconst /* if c + (&v) */
|| e2->Eoper == OPstring
)
{
e2->EV.sp.Voffset += e1->EV.Vpointer;
e2->EV.sp.Voffset &= ptrmask;
e = el_selecte2(e);
goto ret;
}
}
if (!OPTIMIZER)
goto ret;
/* Replace ((e + &v) + c) with (e + (&v+c)) */
if (e2->Eoper == OPconst && e1->Eoper == OPadd &&
(e1->E2->Eoper == OPrelconst || e1->E2->Eoper == OPstring))
{
e1->E2->EV.sp.Voffset += e2->EV.Vpointer;
e1->E2->EV.sp.Voffset &= ptrmask;
e = el_selecte1(e);
goto L1;
}
/* Replace ((e + c) + &v) with (e + (&v+c)) */
else if ((e2->Eoper == OPrelconst || e2->Eoper == OPstring) &&
e1->Eoper == OPadd && cnst(e1->E2))
{
e2->EV.sp.Voffset += e1->E2->EV.Vpointer;
e2->EV.sp.Voffset &= ptrmask;
e->E1 = el_selecte1(e1);
goto L1; /* try and find some more */
}
/* Replace (e1 + -e) with (e1 - e) */
else if (e2->Eoper == OPneg)
{ e->E2 = el_selecte1(e2);
e->Eoper = OPmin;
again = 1;
return e;
}
/* Replace (-v + e) with (e + -v) */
else if (e1->Eoper == OPneg && OTleaf(e1->E1->Eoper))
{ e->E1 = e2;
e->E2 = e1; /* swap leaves */
goto L1;
}
/* Replace ((e - e2) + e2) with (e) */
/* The optimizer sometimes generates this case */
else if (!tyfloating(e->Ety) && /* no floating bugs */
e1->Eoper == OPmin &&
el_match(e1->E2,e2) &&
!el_sideeffect(e2))
{ tym_t tym = e->Ety;
e = el_selecte1(el_selecte1(e));
e->Ety = tym; /* retain original type */
return e;
}
/* Replace ((e - #v+c1) + #v+c2) with ((e - c1) + c2) */
else if (e2->Eoper == OPrelconst &&
e1->Eoper == OPmin &&
e1->E2->Eoper == OPrelconst &&
e1->E2->EV.sp.Vsym == e2->EV.sp.Vsym)
{ e2->Eoper = OPconst;
e2->Ety = TYint;
e1->Ety = e1->E1->Ety;
e1->E2->Eoper = OPconst;
e1->E2->Ety = TYint;
{
#if TARGET_SEGMENTED
/* Watch out for pointer types changing, requiring a conversion */
tym_t ety,e11ty;
ety = tybasic(e->Ety);
e11ty = tybasic(e1->E1->Ety);
if (typtr(ety) && typtr(e11ty) &&
tysize[ety] != tysize[e11ty])
{
e = el_una((tysize[ety] > tysize[e11ty]) ? OPnp_fp : OPoffset,
e->Ety,e);
e->E1->Ety = e1->Ety;
}
#endif
}
again = 1;
return e;
}
/* Replace (e + e) with (e * 2) */
else if (el_match(e1,e2) && !el_sideeffect(e1) && !tyfloating(e->Ety))
{
e->Eoper = OPmul;
el_free(e2);
e->E2 = el_long(e->Ety,2);
again = 1;
return e;
}
// Replace ((e11 + c) + e2) with ((e11 + e2) + c)
if (e1->Eoper == OPadd && e1->E2->Eoper == OPconst &&
(e2->Eoper == OPvar || !OTleaf(e2->Eoper)) &&
tysize(e1->Ety) == tysize(e2->Ety) &&
tysize(e1->E2->Ety) == tysize(e2->Ety))
{
e->E2 = e1->E2;
e1->E2 = e2;
e1->Ety = e->Ety;
goto ret;
}
// Replace ((e11 - e12) + e2) with ((e11 + e2) - e12)
// (this should increase the number of LEA possibilities)
sz = tysize(e->Ety);
if (e1->Eoper == OPmin &&
tysize(e1->Ety) == sz &&
tysize(e2->Ety) == sz &&
tysize(e1->E1->Ety) == sz &&
tysize(e1->E2->Ety) == sz &&
!tyfloating(e->Ety)
)
{
e->Eoper = OPmin;
e->E2 = e1->E2;
e1->E2 = e2;
e1->Eoper = OPadd;
}
ret:
return e;
}
/************************
* Multiply (for OPmul && OPmulass)
* e * (c**2) => e << c ;replace multiply by power of 2 with shift
*/
STATIC elem * elmul(elem *e)
{
tym_t tym = e->Ety;
if (OPTIMIZER)
{
// Replace -a*-b with a*b.
// This is valid for all floating point types as well as integers.
if (tyarithmetic(tym) && e->E2->Eoper == OPneg && e->E1->Eoper == OPneg)
{
e->E1 = el_selecte1(e->E1);
e->E2 = el_selecte1(e->E2);
}
}
elem *e2 = e->E2;
if (e2->Eoper == OPconst) /* try to replace multiplies with shifts */
{
if (OPTIMIZER)
{
elem *e1 = e->E1;
unsigned op1 = e1->Eoper;
if (tyintegral(tym) && // skip floating types
OTbinary(op1) &&
e1->E2->Eoper == OPconst
)
{
/* Attempt to replace ((e + c1) * c2) with (e * c2 + (c1 * c2))
* because the + can be frequently folded out (merged into an
* array offset, for example.
*/
if (op1 == OPadd)
{
e->Eoper = OPadd;
e1->Eoper = OPmul;
e->E2 = el_bin(OPmul,tym,e1->E2,e2);
e1->E2 = el_copytree(e2);
again = 1;
return e;
}
// ((e << c1) * c2) => e * ((1 << c1) * c2)
if (op1 == OPshl)
{
e2->EV.Vullong *= (targ_ullong)1 << el_tolong(e1->E2);
e1->E2->EV.Vullong = 0;
again = 1;
return e;
}
}
if (elemisnegone(e2))
{
e->Eoper = (e->Eoper == OPmul) ? OPneg : OPnegass;
e->E2 = NULL;
el_free(e2);
return e;
}
}