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tinycc/arm-gen.c

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/*
* ARMv4 code generator for TCC
*
* Copyright (c) 2003 Daniel Glöckner
*
* Based on i386-gen.c by Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* number of available registers */
#define NB_REGS 9
/* a register can belong to several classes. The classes must be
sorted from more general to more precise (see gv2() code which does
assumptions on it). */
#define RC_INT 0x0001 /* generic integer register */
#define RC_FLOAT 0x0002 /* generic float register */
#define RC_R0 0x0004
#define RC_R1 0x0008
#define RC_R2 0x0010
#define RC_R3 0x0020
#define RC_R12 0x0040
#define RC_F0 0x0080
#define RC_F1 0x0100
#define RC_F2 0x0200
#define RC_F3 0x0400
#define RC_IRET RC_R0 /* function return: integer register */
#define RC_LRET RC_R1 /* function return: second integer register */
#define RC_FRET RC_F0 /* function return: float register */
/* pretty names for the registers */
enum {
TREG_R0 = 0,
TREG_R1,
TREG_R2,
TREG_R3,
TREG_R12,
TREG_F0,
TREG_F1,
TREG_F2,
TREG_F3,
};
int reg_classes[NB_REGS] = {
/* r0 */ RC_INT | RC_R0,
/* r1 */ RC_INT | RC_R1,
/* r2 */ RC_INT | RC_R2,
/* r3 */ RC_INT | RC_R3,
/* r12 */ RC_INT | RC_R12,
/* f0 */ RC_FLOAT | RC_F0,
/* f1 */ RC_FLOAT | RC_F1,
/* f2 */ RC_FLOAT | RC_F2,
/* f3 */ RC_FLOAT | RC_F3,
};
static int two2mask(int a,int b) {
return (reg_classes[a]|reg_classes[b])&~(RC_INT|RC_FLOAT);
}
static int regmask(int r) {
return reg_classes[r]&~(RC_INT|RC_FLOAT);
}
/* return registers for function */
#define REG_IRET TREG_R0 /* single word int return register */
#define REG_LRET TREG_R1 /* second word return register (for long long) */
#define REG_FRET TREG_F0 /* float return register */
/* defined if function parameters must be evaluated in reverse order */
#define INVERT_FUNC_PARAMS
/* defined if structures are passed as pointers. Otherwise structures
are directly pushed on stack. */
//#define FUNC_STRUCT_PARAM_AS_PTR
/* pointer size, in bytes */
#define PTR_SIZE 4
/* long double size and alignment, in bytes */
#define LDOUBLE_SIZE 8
#define LDOUBLE_ALIGN 4
/* maximum alignment (for aligned attribute support) */
#define MAX_ALIGN 8
#define CHAR_IS_UNSIGNED
/******************************************************/
/* ELF defines */
#define EM_TCC_TARGET EM_ARM
/* relocation type for 32 bit data relocation */
#define R_DATA_32 R_ARM_ABS32
#define R_JMP_SLOT R_ARM_JUMP_SLOT
#define R_COPY R_ARM_COPY
#define ELF_START_ADDR 0x00008000
#define ELF_PAGE_SIZE 0x1000
/******************************************************/
static unsigned long func_sub_sp_offset,last_itod_magic;
void o(unsigned long i)
{
/* this is a good place to start adding big-endian support*/
int ind1;
ind1 = ind + 4;
if (ind1 > cur_text_section->data_allocated)
section_realloc(cur_text_section, ind1);
cur_text_section->data[ind++] = i&255;
i>>=8;
cur_text_section->data[ind++] = i&255;
i>>=8;
cur_text_section->data[ind++] = i&255;
i>>=8;
cur_text_section->data[ind++] = i;
}
static unsigned long stuff_const(unsigned long op,unsigned long c)
{
int try_neg=0;
unsigned long nc,negop;
switch(op&0x1F00000)
{
case 0x800000: //add
case 0x400000: //sub
try_neg=1;
negop=op^0xC00000;
nc=-c;
break;
case 0x1A00000: //mov
case 0x1E00000: //mvn
try_neg=1;
negop=op^0x400000;
nc=~c;
break;
case 0x200000: //xor
if(c==~0)
return (op&0xF010F000)|((op>>16)&0xF)|0x1E00000;
break;
case 0x0: //and
if(c==~0)
return (op&0xF010F000)|((op>>16)&0xF)|0x1A00000;
case 0x1C00000: //bic
try_neg=1;
negop=op^0x1C00000;
nc=~c;
break;
case 0x1800000: //orr
if(c==~0)
return (op&0xFFF0FFFF)|0x1E00000;
break;
}
do {
unsigned long m;
int i;
if(c<256) /* catch undefined <<32 */
return op|c;
for(i=2;i<32;i+=2) {
m=(0xff>>i)|(0xff<<(32-i));
if(!(c&~m))
return op|(i<<7)|(c<<i)|(c>>(32-i));
}
op=negop;
c=nc;
} while(try_neg--);
return 0;
}
//only add,sub
void stuff_const_harder(unsigned long op,unsigned long v) {
unsigned long x;
x=stuff_const(op,v);
if(x)
o(x);
else {
unsigned long a[16],nv,no,o2,n2;
int i,j,k;
a[0]=0xff;
o2=(op&0xfff0ffff)|((op&0xf000)<<4);;
for(i=1;i<16;i++)
a[i]=(a[i-1]>>2)|(a[i-1]<<30);
for(i=0;i<12;i++)
for(j=i+4;i<13+i;i++)
if((v&(a[i]|a[j]))==v) {
o(stuff_const(op,v&a[i]));
o(stuff_const(o2,v&a[j]));
return;
}
no=op^0xC00000;
n2=o2^0xC00000;
nv=-v;
for(i=0;i<12;i++)
for(j=i+4;i<13+i;i++)
if((nv&(a[i]|a[j]))==nv) {
o(stuff_const(no,nv&a[i]));
o(stuff_const(n2,nv&a[j]));
return;
}
for(i=0;i<8;i++)
for(j=i+4;i<12;i++)
for(k=j+4;k<13+i;i++)
if((v&(a[i]|a[j]|a[k]))==v) {
o(stuff_const(op,v&a[i]));
o(stuff_const(o2,v&a[j]));
o(stuff_const(o2,v&a[k]));
return;
}
no=op^0xC00000;
nv=-v;
for(i=0;i<8;i++)
for(j=i+4;i<12;i++)
for(k=j+4;k<13+i;i++)
if((nv&(a[i]|a[j]|a[k]))==nv) {
o(stuff_const(no,nv&a[i]));
o(stuff_const(n2,nv&a[j]));
o(stuff_const(n2,nv&a[k]));
return;
}
o(stuff_const(op,v&a[0]));
o(stuff_const(o2,v&a[4]));
o(stuff_const(o2,v&a[8]));
o(stuff_const(o2,v&a[12]));
}
}
unsigned long encbranch(int pos,int addr,int fail)
{
addr-=pos+8;
addr/=4;
if(addr>=0x1000000 || addr<-0x1000000) {
if(fail)
error("FIXME: function bigger than 32MB");
return 0;
}
return 0x0A000000|(addr&0xffffff);
}
int decbranch(int pos)
{
int x;
x=*(int *)(cur_text_section->data + pos);
x&=0x00ffffff;
if(x&0x800000)
x-=0x1000000;
return x*4+pos+8;
}
/* output a symbol and patch all calls to it */
void gsym_addr(int t, int a)
{
unsigned long *x;
int lt;
while(t) {
x=(unsigned long *)(cur_text_section->data + t);
t=decbranch(lt=t);
if(a==lt+4)
*x=0xE1A00000; // nop
else {
*x &= 0xff000000;
*x |= encbranch(lt,a,1);
}
}
}
void gsym(int t)
{
gsym_addr(t, ind);
}
static unsigned long fpr(int r)
{
return r-5;
}
static unsigned long intr(int r)
{
return r==4?12:r;
}
static void calcaddr(unsigned long *base,int *off,int *sgn,int maxoff,unsigned shift)
{
if(*off>maxoff || *off&((1<<shift)-1)) {
unsigned long x,y;
x=0xE280E000;
if(*sgn)
x=0xE240E000;
x|=(*base)<<16;
*base=14; // lr
y=stuff_const(x,*off&~maxoff);
if(y) {
o(y);
*off&=maxoff;
return;
}
y=stuff_const(x,(*off+maxoff)&~maxoff);
if(y) {
o(y);
*sgn=!*sgn;
*off=((*off+maxoff)&~maxoff)-*off;
return;
}
stuff_const_harder(x,*off&~maxoff);
*off&=maxoff;
}
}
static unsigned long mapcc(int cc)
{
switch(cc)
{
case TOK_ULT:
return 0x30000000;
case TOK_UGE:
return 0x20000000;
case TOK_EQ:
return 0x00000000;
case TOK_NE:
return 0x10000000;
case TOK_ULE:
return 0x90000000;
case TOK_UGT:
return 0x80000000;
case TOK_LT:
return 0xB0000000;
case TOK_GE:
return 0xA0000000;
case TOK_LE:
return 0xD0000000;
case TOK_GT:
return 0xC0000000;
}
error("unexpected condition code");
return 0xE0000000;
}
static int negcc(int cc)
{
switch(cc)
{
case TOK_ULT:
return TOK_UGE;
case TOK_UGE:
return TOK_ULT;
case TOK_EQ:
return TOK_NE;
case TOK_NE:
return TOK_EQ;
case TOK_ULE:
return TOK_UGT;
case TOK_UGT:
return TOK_ULE;
case TOK_LT:
return TOK_GE;
case TOK_GE:
return TOK_LT;
case TOK_LE:
return TOK_GT;
case TOK_GT:
return TOK_LE;
}
error("unexpected condition code");
return TOK_NE;
}
/* load 'r' from value 'sv' */
void load(int r, SValue *sv)
{
int v, ft, fc, fr, sign;
unsigned long op;
SValue v1;
fr = sv->r;
ft = sv->type.t;
fc = sv->c.ul;
if(fc>=0)
sign=0;
else {
sign=1;
fc=-fc;
}
v = fr & VT_VALMASK;
if (fr & VT_LVAL) {
unsigned long base=0xB; // fp
if(v == VT_LLOCAL) {
v1.type.t = VT_PTR;
v1.r = VT_LOCAL | VT_LVAL;
v1.c.ul = sv->c.ul;
load(base=14 /* lr */, &v1);
fc=sign=0;
v=VT_LOCAL;
} else if(v == VT_CONST) {
v1.type.t = VT_PTR;
v1.r = fr&~VT_LVAL;
v1.c.ul = sv->c.ul;
v1.sym=sv->sym;
load(base=14, &v1);
fc=sign=0;
v=VT_LOCAL;
} else if(v < VT_CONST) {
base=intr(v);
fc=sign=0;
v=VT_LOCAL;
}
if(v == VT_LOCAL) {
if(is_float(ft)) {
calcaddr(&base,&fc,&sign,1020,2);
op=0xED100100;
if(!sign)
op|=0x800000;
if ((ft & VT_BTYPE) != VT_FLOAT)
op|=0x8000;
o(op|(fpr(r)<<12)|(fc>>2)|(base<<16));
} else if((ft & VT_TYPE) == VT_BYTE || (ft & VT_BTYPE) == VT_SHORT) {
calcaddr(&base,&fc,&sign,255,0);
op=0xE1500090;
if ((ft & VT_BTYPE) == VT_SHORT)
op|=0x20;
if ((ft & VT_UNSIGNED) == 0)
op|=0x40;
if(!sign)
op|=0x800000;
o(op|(intr(r)<<12)|(base<<16)|((fc&0xf0)<<4)|(fc&0xf));
} else {
calcaddr(&base,&fc,&sign,4095,0);
op=0xE5100000;
if(!sign)
op|=0x800000;
if ((ft & VT_BTYPE) == VT_BYTE)
op|=0x400000;
o(op|(intr(r)<<12)|fc|(base<<16));
}
return;
}
} else {
if (v == VT_CONST) {
op=stuff_const(0xE3A00000|(intr(r)<<12),sv->c.ul);
if (fr & VT_SYM || !op) {
o(0xE59F0000|(intr(r)<<12));
o(0xEA000000);
if(fr & VT_SYM)
greloc(cur_text_section, sv->sym, ind, R_ARM_ABS32);
o(sv->c.ul);
} else
o(op);
return;
} else if (v == VT_LOCAL) {
op=stuff_const(0xE28B0000|(intr(r)<<12),sv->c.ul);
if (fr & VT_SYM || !op) {
o(0xE59F0000|(intr(r)<<12));
o(0xEA000000);
if(fr & VT_SYM) // needed ?
greloc(cur_text_section, sv->sym, ind, R_ARM_ABS32);
o(sv->c.ul);
o(0xE08B0000|(intr(r)<<12)|intr(r));
} else
o(op);
return;
} else if(v == VT_CMP) {
o(mapcc(sv->c.ul)|0x3A00001|(intr(r)<<12));
o(mapcc(negcc(sv->c.ul))|0x3A00000|(intr(r)<<12));
return;
} else if (v == VT_JMP || v == VT_JMPI) {
int t;
t = v & 1;
o(0xE3A00000|(intr(r)<<12)|t);
o(0xEA000000);
gsym(sv->c.ul);
o(0xE3A00000|(intr(r)<<12)|(t^1));
return;
} else if (v < VT_CONST) {
if(is_float(ft))
o(0xEE008180|(fpr(r)<<12)|fpr(v));
else
o(0xE1A00000|(intr(r)<<12)|intr(v));
return;
}
}
error("load unimplemented!");
}
/* store register 'r' in lvalue 'v' */
void store(int r, SValue *sv)
{
SValue v1;
int v, ft, fc, fr, sign;
unsigned long op;
fr = sv->r;
ft = sv->type.t;
fc = sv->c.ul;
if(fc>=0)
sign=0;
else {
sign=1;
fc=-fc;
}
v = fr & VT_VALMASK;
if (fr & VT_LVAL || fr == VT_LOCAL) {
unsigned long base=0xb;
if(v < VT_CONST) {
base=intr(v);
v=VT_LOCAL;
fc=sign=0;
} else if(v == VT_CONST) {
v1.type.t = ft;
v1.r = fr&~VT_LVAL;
v1.c.ul = sv->c.ul;
v1.sym=sv->sym;
load(base=14, &v1);
fc=sign=0;
v=VT_LOCAL;
}
if(v == VT_LOCAL) {
if(is_float(ft)) {
calcaddr(&base,&fc,&sign,1020,2);
op=0xED000100;
if(!sign)
op|=0x800000;
if ((ft & VT_BTYPE) != VT_FLOAT)
op|=0x8000;
o(op|(fpr(r)<<12)|(fc>>2)|(base<<16));
return;
} else if((ft & VT_BTYPE) == VT_SHORT) {
calcaddr(&base,&fc,&sign,255,0);
op=0xE14000B0;
if(!sign)
op|=0x800000;
o(op|(intr(r)<<12)|(base<<16)|((fc&0xf0)<<4)|(fc&0xf));
} else {
calcaddr(&base,&fc,&sign,4095,0);
op=0xE5000000;
if(!sign)
op|=0x800000;
if ((ft & VT_BTYPE) == VT_BYTE)
op|=0x400000;
o(op|(intr(r)<<12)|fc|(base<<16));
}
return;
}
}
error("store unimplemented");
}
static void gadd_sp(int val)
{
stuff_const_harder(0xE28DD000,val);
}
/* 'is_jmp' is '1' if it is a jump */
static void gcall_or_jmp(int is_jmp)
{
int r;
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
unsigned long x;
/* constant case */
x=encbranch(ind,ind+vtop->c.ul,0);
if(x) {
if (vtop->r & VT_SYM) {
/* relocation case */
greloc(cur_text_section, vtop->sym, ind, R_ARM_PC24);
} else
put_elf_reloc(symtab_section, cur_text_section, ind, R_ARM_PC24, 0);
o(x|(is_jmp?0xE0000000:0xE1000000));
} else {
if(!is_jmp)
o(0xE28FE004); // add lr,pc,#4
o(0xE51FF004); // ldr pc,[pc,#-4]
if (vtop->r & VT_SYM)
greloc(cur_text_section, vtop->sym, ind, R_ARM_ABS32);
o(vtop->c.ul);
}
} else {
/* otherwise, indirect call */
r = gv(RC_INT);
if(!is_jmp)
o(0xE1A0E00F); // mov lr,pc
o(0xE1A0F000|intr(r)); // mov pc,r
}
}
/* Generate function call. The function address is pushed first, then
all the parameters in call order. This functions pops all the
parameters and the function address. */
void gfunc_call(int nb_args)
{
int size, align, r, args_size, i;
Sym *func_sym;
args_size = 0;
for(i = 0;i < nb_args; i++) {
if ((vtop->type.t & VT_BTYPE) == VT_STRUCT) {
size = type_size(&vtop->type, &align);
/* align to stack align size */
size = (size + 3) & ~3;
/* allocate the necessary size on stack */
gadd_sp(-size);
/* generate structure store */
r = get_reg(RC_INT);
o(0xE1A0000D|(intr(r)<<12));
vset(&vtop->type, r | VT_LVAL, 0);
vswap();
vstore();
args_size += size;
} else if (is_float(vtop->type.t)) {
r=fpr(gv(RC_FLOAT))<<12;
if ((vtop->type.t & VT_BTYPE) == VT_FLOAT)
size = 4;
else if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
size = 8;
else
size = LDOUBLE_SIZE;
if (size == 12)
r|=0x400000;
else if(size == 8)
r|=0x8000;
o(0xED2D0100|r);
args_size += size;
} else {
/* simple type (currently always same size) */
/* XXX: implicit cast ? */
r = gv(RC_INT);
if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
size = 8;
o(0xE52D0004|(intr(vtop->r2)<<12)); /* str r2,[sp,#-4]! */
} else {
size = 4;
}
o(0xE52D0004|(intr(vtop->r)<<12)); /* str r,[sp,#-4]! */
args_size += size;
}
vtop--;
}
save_regs(0); /* save used temporary registers */
if(args_size) {
int n;
n=args_size/4;
if(n>4)
n=4;
o(0xE8BD0000|((1<<n)-1));
args_size-=n*4;
}
func_sym = vtop->type.ref;
gcall_or_jmp(0);
if (args_size)
gadd_sp(args_size);
vtop--;
}
/* generate function prolog of type 't' */
void gfunc_prolog(CType *func_type)
{
Sym *sym,*sym2;
int n,addr,size,align;
sym = func_type->ref;
func_vt = sym->type;
n=0;
addr=12;
if((func_vt.t & VT_BTYPE) == VT_STRUCT) {
func_vc = addr;
addr += 4;
n++;
}
for(sym2=sym->next;sym2 && n<4;sym2=sym2->next) {
size = type_size(&sym2->type, &align);
size = (size + 3) & ~3;
n+=size/4;
}
o(0xE1A0C00D); /* mov ip,sp */
if(func_type->ref->c == FUNC_ELLIPSIS)
n=4;
if(n) {
if(n>4)
n=4;
o(0xE92D0000|((1<<n)-1)); /* save r0-r4 on stack if needed */
}
o(0xE92D5800); /* save fp, ip, lr*/
o(0xE1A0B00D); /* mov fp,sp */
func_sub_sp_offset = ind;
o(0xE1A00000); /* nop, leave space for stack adjustment */
while ((sym = sym->next)) {
CType *type;
type = &sym->type;
sym_push(sym->v & ~SYM_FIELD, type, VT_LOCAL | VT_LVAL, addr);
size = type_size(type, &align);
size = (size + 3) & ~3;
addr += size;
}
last_itod_magic=0;
}
/* generate function epilog */
void gfunc_epilog(void)
{
unsigned long x;
o(0xE89BA800); /* restore fp, sp, pc */
if(loc) {
x=stuff_const(0xE24DD000, (-loc + 3) & -4); /* sub sp,sp,# */
if(x)
*(unsigned long *)(cur_text_section->data + func_sub_sp_offset) = x;
else {
unsigned long addr;
addr=ind;
o(0xE59FC004); /* ldr ip,[pc+4] */
o(0xE04DD00C); /* sub sp,sp,ip */
o(0xE1A0F00E); /* mov pc,lr */
o((-loc + 3) & -4);
*(unsigned long *)(cur_text_section->data + func_sub_sp_offset) = 0xE1000000|encbranch(func_sub_sp_offset,addr,1);
}
}
}
/* generate a jump to a label */
int gjmp(int t)
{
int r;
r=ind;
o(0xE0000000|encbranch(r,t,1));
return r;
}
/* generate a jump to a fixed address */
void gjmp_addr(int a)
{
gjmp(a);
}
/* generate a test. set 'inv' to invert test. Stack entry is popped */
int gtst(int inv, int t)
{
int v, r;
unsigned long op;
v = vtop->r & VT_VALMASK;
r=ind;
if (v == VT_CMP) {
op=mapcc(inv?negcc(vtop->c.i):vtop->c.i);
op|=encbranch(r,t,1);
o(op);
t=r;
} else if (v == VT_JMP || v == VT_JMPI) {
if ((v & 1) == inv) {
if(!vtop->c.i)
vtop->c.i=t;
else {
unsigned long *x;
int p,lp;
if(t) {
p = vtop->c.i;
do {
p = decbranch(lp=p);
} while(p);
x = (unsigned long *)(cur_text_section->data + lp);
*x &= 0xff000000;
*x |= encbranch(lp,t,1);
}
t = vtop->c.i;
}
} else {
t = gjmp(t);
gsym(vtop->c.i);
}
} else {
if (is_float(vtop->type.t)) {
r=gv(RC_FLOAT);
o(0xEE90F118|fpr(r)<<16);
vtop->r = VT_CMP;
vtop->c.i = TOK_NE;
return gtst(inv, t);
} else if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
/* constant jmp optimization */
if ((vtop->c.i != 0) != inv)
t = gjmp(t);
} else {
v = gv(RC_INT);
o(0xE3300000|(intr(v)<<16));
vtop->r = VT_CMP;
vtop->c.i = TOK_NE;
return gtst(inv, t);
}
}
vtop--;
return t;
}
/* generate an integer binary operation */
void gen_opi(int op)
{
int c, func;
unsigned long opc,r,fr;
c=0;
switch(op) {
case '+':
opc = 0x8;
c=1;
break;
case TOK_ADDC1: /* add with carry generation */
opc = 0x9;
c=1;
break;
case '-':
opc = 0x4;
c=1;
break;
case TOK_SUBC1: /* sub with carry generation */
opc = 0x5;
c=1;
break;
case TOK_ADDC2: /* add with carry use */
opc = 0xA;
c=1;
break;
case TOK_SUBC2: /* sub with carry use */
opc = 0xC;
c=1;
break;
case '&':
opc = 0x0;
c=1;
break;
case '^':
opc = 0x2;
c=1;
break;
case '|':
opc = 0x18;
c=1;
break;
case '*':
gv2(RC_INT, RC_INT);
r = vtop[-1].r;
fr = vtop[0].r;
vtop--;
o(0xE0000090|(intr(r)<<16)|(intr(r)<<8)|intr(fr));
return;
case TOK_SHL:
opc = 0;
c=2;
break;
case TOK_SHR:
opc = 1;
c=2;
break;
case TOK_SAR:
opc = 2;
c=2;
break;
case '/':
case TOK_PDIV:
func=TOK___divsi3;
c=3;
break;
case TOK_UDIV:
func=TOK___udivsi3;
c=3;
break;
case '%':
func=TOK___modsi3;
c=3;
break;
case TOK_UMOD:
func=TOK___umodsi3;
c=3;
break;
case TOK_UMULL:
gv2(RC_INT, RC_INT);
r=intr(vtop[-1].r2=get_reg(RC_INT));
c=vtop[-1].r;
vtop[-1].r=get_reg_ex(RC_INT,regmask(c));
vtop--;
o(0xE0800090|(r<<16)|(intr(vtop->r)<<12)|(intr(c)<<8)|intr(vtop[1].r));
return;
default:
opc = 0x15;
c=1;
}
switch(c) {
case 1:
if((vtop[-1].r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
if(opc == 4 || opc == 5 || opc == 0xc) {
vswap();
opc|=2; // sub -> rsb
}
}
vswap();
c=intr(gv(RC_INT));
vswap();
opc=0xE0000000|(opc<<20)|(c<<16);
if((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
unsigned long x;
x=stuff_const(opc|0x2000000,vtop->c.i);
if(x) {
r=intr(vtop[-1].r=get_reg_ex(RC_INT,regmask(vtop[-1].r)));
o(x|(r<<12));
goto done;
}
}
fr=intr(gv(RC_INT));
r=intr(vtop[-1].r=get_reg_ex(RC_INT,two2mask(vtop->r,vtop[-1].r)));
o(opc|(r<<12)|fr);
done:
vtop--;
if (op >= TOK_ULT && op <= TOK_GT) {
vtop->r = VT_CMP;
vtop->c.i = op;
}
break;
case 2:
opc=0xE1A00000|(opc<<5);
vswap();
r=intr(gv(RC_INT));
vswap();
opc|=r;
if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
fr=intr(vtop[-1].r=get_reg_ex(RC_INT,regmask(vtop[-1].r)));
c = vtop->c.i & 0x1f;
o(opc|(c<<7)|(fr<<12));
} else {
fr=intr(gv(RC_INT));
c=intr(vtop[-1].r=get_reg_ex(RC_INT,two2mask(vtop->r,vtop[-1].r)));
o(opc|(c<<12)|(fr<<8)|0x10);
}
vtop--;
break;
case 3:
vpush_global_sym(&func_old_type, func);
vrott(3);
gfunc_call(2);
vpushi(0);
vtop->r = REG_IRET;
break;
default:
error("gen_opi %i unimplemented!",op);
}
}
static int is_fconst()
{
long double f;
int r;
if((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
return 0;
if (vtop->type.t == VT_FLOAT)
f = vtop->c.f;
else if (vtop->type.t == VT_DOUBLE)
f = vtop->c.d;
else
f = vtop->c.ld;
if(!ieee_finite(f))
return 0;
r=0x8;
if(f<0.0) {
r=0x18;
f=-f;
}
if(f==0.0)
return r;
if(f==1.0)
return r|1;
if(f==2.0)
return r|2;
if(f==3.0)
return r|3;
if(f==4.0)
return r|4;
if(f==5.0)
return r|5;
if(f==0.5)
return r|6;
if(f==10.0)
return r|7;
return 0;
}
/* generate a floating point operation 'v = t1 op t2' instruction. The
two operands are guaranted to have the same floating point type */
void gen_opf(int op)
{
unsigned long x;
int r,r2,c1,c2;
//fputs("gen_opf\n",stderr);
vswap();
c1 = is_fconst();
vswap();
c2 = is_fconst();
x=0xEE000180;
switch(op)
{
case '+':
if(!c2) {
vswap();
c2=c1;
}
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
if(c2) {
if(c2>0xf)
x|=0x200000; // suf
r2=c2&0xf;
} else {
r2=fpr(gv(RC_FLOAT));
}
break;
case '-':
if(c2) {
if(c2<=0xf)
x|=0x200000; // suf
r2=c2&0xf;
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
} else if(c1 && c1<=0xf) {
x|=0x300000; // rsf
r2=c1;
r=fpr(gv(RC_FLOAT));
vswap();
} else {
x|=0x200000; // suf
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
r2=fpr(gv(RC_FLOAT));
}
break;
case '*':
if(!c2 || c2>0xf) {
vswap();
c2=c1;
}
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
if(c2 && c2<=0xf)
r2=c2;
else
r2=fpr(gv(RC_FLOAT));
x|=0x100000; // muf
break;
case '/':
if(c2 && c2<=0xf) {
x|=0x400000; // dvf
r2=c2;
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
} else if(c1 && c1<=0xf) {
x|=0x500000; // rdf
r2=c1;
r=fpr(gv(RC_FLOAT));
vswap();
} else {
x|=0x400000; // dvf
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
r2=fpr(gv(RC_FLOAT));
}
break;
default:
if(op >= TOK_ULT && op <= TOK_GT) {
switch(op) {
case TOK_ULT:
case TOK_UGE:
case TOK_ULE:
case TOK_UGT:
fputs("unsigned comparision on floats?\n",stderr);
break;
case TOK_LT:
op=TOK_ULT;
break;
case TOK_GE:
op=TOK_UGE;
break;
case TOK_LE:
op=TOK_ULE;
break;
case TOK_GT:
op=TOK_UGT;
break;
}
x|=0x90f110;
if(c1 && !c2) {
c2=c1;
vswap();
switch(op) {
case TOK_ULT:
op=TOK_UGT;
break;
case TOK_UGE:
op=TOK_ULE;
break;
case TOK_ULE:
op=TOK_UGE;
break;
case TOK_UGT:
op=TOK_ULT;
break;
}
}
vswap();
r=fpr(gv(RC_FLOAT));
vswap();
if(c2) {
if(c2>0xf)
x|=0x200000;
r2=c2&0xf;
} else {
r2=fpr(gv(RC_FLOAT));
}
vtop[-1].r = VT_CMP;
vtop[-1].c.i = op;
} else {
error("unknown fp op %x!\n",op);
return;
}
}
if(vtop[-1].r == VT_CMP)
c1=15;
else {
c1=vtop->r;
if(r2&0x8)
c1=vtop[-1].r;
vtop[-1].r=get_reg_ex(RC_FLOAT,two2mask(vtop[-1].r,c1));
c1=fpr(vtop[-1].r);
}
vtop--;
o(x|(r<<16)|(c1<<12)|r2);
}
/* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
and 'long long' cases. */
void gen_cvt_itof(int t)
{
int r,r2,bt;
r=intr(gv(RC_INT));
r2=fpr(vtop->r=get_reg(RC_FLOAT));
bt=vtop->type.t & VT_BTYPE;
if(bt == VT_INT || bt == VT_SHORT || bt == VT_BYTE) {
o(0xEE000190|(r2<<16)|(r<<12));
if((vtop->type.t & (VT_UNSIGNED|VT_BTYPE)) == (VT_UNSIGNED|VT_INT)) {
unsigned int off=0;
o(0xE3500000|(r<<12));
r=fpr(get_reg(RC_FLOAT));
if(last_itod_magic) {
off=ind+8-last_itod_magic;
off/=4;
if(off>255)
off=0;
}
o(0xBD1F8100|(r<<12)|off);
if(!off) {
o(0xEA000001);
last_itod_magic=ind;
o(0x41F00000);
o(0);
}
o(0xBE000180|(r2<<16)|(r2<<12)|r);
}
return;
} else if(bt == VT_LLONG) {
int r3;
unsigned long x=0;
r3=intr(vtop->r2);
o(0xe52d0004|(r<<12)); //str r0, [sp, -#4]!
o(0xe3500000|(r3<<16)); //cmp r1, #0
o(0xa3800102|(r3<<16)|(r3<<12)); //orrge r1, r1, #0x80000000
o(0xe59f0014|(r<<12)); //ldr r0, [pc, #20]
o(0xe52d0004|(r3<<12)); //str r1, [sp, -#4]!
o(0xe52d0004|(r<<12)); //str r0, [sp, -#4]!
o(0xecfd0103|(r2<<12)); //ldfe f0, [sp], #12
r=fpr(get_reg(RC_FLOAT));
if((vtop->type.t & VT_UNSIGNED) != VT_UNSIGNED)
x=0xE0000000;
o(0xaddf0101|(r<<12)|x); //ldf(ge)e f1, [pc, #4]
o(0xae280100|(r2<<16)|(r2<<12)|r|x); //suf(ge)e f0, f0, f1
o(0xea000002); //b pc+8
o(0x403e);o(0x80000000);o(0);
if(x)
o(0xbe280100|(r2<<16)|(r2<<12)|r); //suflte f0, f0, f1
vtop->r2=VT_CONST;
return;
}
error("unimplemented gen_cvt_itof %x!",vtop->type.t);
}
/* convert fp to int 't' type */
void gen_cvt_ftoi(int t)
{
int r,r2,u;
u=t&VT_UNSIGNED;
t&=VT_BTYPE;
r=fpr(gv(RC_FLOAT));
r2=intr(vtop->r=get_reg(RC_INT));
if(t==VT_INT) {
if(u) {
u=fpr(get_reg(RC_FLOAT));
o(0xed9f0100|(u<<12));
o(0xea000000);
o(0x4f000000);
o(0xee90f110|(r<<12)|u);
o(0x2e200180|(r<<16)|(r<<12)|u);
o(0x2e200180|(r<<16)|(r<<12)|u);
o(0xee100150|(r2<<12)|u);
} else
o(0xEE100170|(r<<12)|r);
return;
} else if(t==VT_LLONG) {
int Q,R;
Q=r2;
R=intr(vtop->r2=get_reg(RC_INT));
if(Q<R) {
Q=R;
R=r2;
r2=vtop->r;
vtop->r=vtop->r2;
vtop->r2=r2;
}
if(!u)
r2=intr(get_reg(RC_INT));
o(0xed6d0103|(r<<12));
o(0xe0dde0b4);
o(0xe8bd0000|(1<<Q)|(1<<R));
if(!u)
o(0xe20e0902|(r2<<12));
o(0xe3cee902);
o(0xe24eec3f);
o(0xe25ee0ff);
if(!u) {
o(0xb3a00000|(R<<12));
o(0xb3a00000|(Q<<12));
}
o(0xba000000|(u?5:9));
o(0xe25ee03f);
o(0xaa000000|(u?5:3));
o(0xe1b000a0|(R<<12)|R);
o(0xe1a00060|(Q<<12)|Q);
o(0xe29ee001);
o(0x1afffffb);
if(u) {
o(0x13a00000|(R<<12));
o(0x13a00000|(Q<<12));
} else {
o(0xe3500000|(r2<<12));
o(0x0a000001);
o(0xe2700000|(Q<<16)|(Q<<12));
o(0xe2e00000|(R<<16)|(R<<12));
}
return;
}
error("unimplemented gen_cvt_ftoi!");
}
/* convert from one floating point type to another */
void gen_cvt_ftof(int t)
{
/* all we have to do on i386 and ARM is to put the float in a register */
gv(RC_FLOAT);
}
/* computed goto support */
void ggoto(void)
{
gcall_or_jmp(1);
vtop--;
}
/* end of ARM code generator */
/*************************************************************/
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