/*
 * $Source$
 * $State$
 */

operation
	: OP_BF_BFA            CR ',' CR                  { emit4($1 | ($2<<23) | ($4<<18)); }
	| OP_BF_FRA_FRB        CR ',' FPR ',' FPR         { emit4($1 | ($2<<23) | ($4<<16) | ($6<<11)); }
	| OP_BF_L_RA_RB        CR ',' u1 ',' GPR ',' GPR  { emit4($1 | ($2<<23) | ($4<<21) | ($6<<16) | ($8<<11)); }
	| OP_BF_L_RA_SI        CR ',' u1 ',' GPR ',' e16  { emit4($1 | ($2<<23) | ($4<<21) | ($6<<16) | $8); }
	| OP_BF_L_RA_UI        CR ',' u1 ',' GPR ',' e16  { emit4($1 | ($2<<23) | ($4<<21) | ($6<<16) | $8); }
	| OP_BF_U_C            c CR ',' u4                { emit4($1 | $2 | ($3<<23) | ($5<<12)); }
	| OP_BO_BI_BDA         u5 ',' u5 ',' bda          { emit4($1 | ($2<<21) | ($4<<16) | $6); }
	| OP_BO_BI_BDL         u5 ',' u5 ',' bdl          { emit4($1 | ($2<<21) | ($4<<16) | $6); }
	| OP_BO_BI_BH          u5 ',' u5 ',' u2           { emit4($1 | ($2<<21) | ($4<<16) | ($6<<11)); }
	| OP_BT_BA_BB          u5 ',' u5 ',' u5           { emit4($1 | ($2<<21) | ($4<<16) | ($6<<11)); }
	| OP_BT_C              c u5                       { emit4($1 | $2 | ($3<<21)); }
	| OP_FLM_FRB_C         c u8 ',' FPR               { emit4($1 | $2 | ($3<<17) | ($5<<11)); }
	| OP_FRS_RA_D          FPR ',' e16 '(' GPR ')'    { emit4($1 | ($2<<21) | ($6<<16) | $4); }
	| OP_FRS_RA_RB         FPR ',' GPR ',' GPR        { emit4($1 | ($2<<21) | ($4<<16) | ($6<<11)); }
	| OP_FRT_FRA_FRB_C     c FPR ',' FPR ',' FPR      { emit4($1 | $2 | ($3<<21) | ($5<<16) | ($7<<11)); }
	| OP_FRT_FRA_FRC_FRB_C c FPR ',' FPR ',' FPR ',' FPR { emit4($1 | $2 | ($3<<21) | ($5<<16) | ($9<<11) | ($7<<6)); } 
	| OP_FRT_FRA_FRC_C     c FPR ',' FPR ',' FPR      { emit4($1 | $2 | ($3<<21) | ($5<<16) | ($7<<6)); }
	| OP_FRT_FRB_C         c FPR ',' FPR              { emit4($1 | $2 | ($3<<21) | ($5<<11)); } 
	| OP_FRT_RA_D          FPR ',' e16 '(' GPR ')'    { emit4($1 | ($2<<21) | ($6<<16) | $4); }
	| OP_FRT_RA_RB         FPR ',' GPR ',' GPR        { emit4($1 | ($2<<21) | ($4<<16) | ($6<<11)); }
	| OP_FRT_C             c FPR                      { emit4($1 | $2 | ($3<<21)); }
	| OP_RT                GPR                        { emit4($1 | ($2<<21)); }
	| OP_RT_RA_C           c GPR ',' GPR              { emit4($1 | $2 | ($3<<21) | ($5<<16)); }
	| OP_RT_RA_D           GPR ',' e16 '(' GPR ')'    { emit4($1 | ($2<<21) | ($6<<16) | $4); }
	| OP_RT_RA_DS          GPR ',' ds '(' GPR ')'     { emit4($1 | ($2<<21) | ($6<<16) | $4); }
	| OP_RT_RA_NB          GPR ',' GPR ',' nb         { emit4($1 | ($2<<21) | ($4<<16) | ($6<<11)); }
	| OP_RT_RA_RB          GPR ',' GPR ',' GPR        { emit4($1 | ($2<<21) | ($4<<16) | ($6<<11)); }
    | OP_RT_RA_RB_C        c GPR ',' GPR ',' GPR      { emit4($1 | $2 | ($3<<21) | ($5<<16) | ($7<<11)); }
	| OP_RT_RA_SI          GPR ',' GPR ',' e16        { emit4($1 | ($2<<21) | ($4<<16) | $6); }
	| OP_RT_RA_SI_addic    c GPR ',' GPR ',' e16      { emit4($1 | ($2<<26) | ($3<<21) | ($5<<16) | $7); }
	| OP_RT_SPR            GPR ',' SPR                { emit4($1 | ($2<<21) | ($4<<11)); }
	| OP_RS_FXM            u7 ',' GPR                 { emit4($1 | ($4<<21) | ($2<<12)); }
	| OP_RS_RA_C           c GPR ',' GPR              { emit4($1 | $2 | ($5<<21) | ($3<<16)); }
	| OP_RS_RA_D           GPR ',' e16 '(' GPR ')'    { emit4($1 | ($2<<21) | ($6<<16) | $4); }
	| OP_RS_RA_DS          GPR ',' ds '(' GPR ')'     { emit4($1 | ($2<<21) | ($6<<16) | $4); }
	| OP_RS_RA_NB          GPR ',' GPR ',' nb         { emit4($1 | ($2<<21) | ($4<<16) | ($6<<11)); }
	| OP_RS_RA_UI          GPR ',' GPR ',' e16        { emit4($1 | ($4<<21) | ($2<<16) | $6); } 
	| OP_RS_RA_UI_CC       C GPR ',' GPR ',' e16      { emit4($1 | ($5<<21) | ($3<<16) | $7); } 
	| OP_RS_RA_RB          GPR ',' GPR ',' GPR        { emit4($1 | ($2<<21) | ($4<<16) | ($6<<11)); }
	| OP_RS_RA_RB_C        c GPR ',' GPR ',' GPR      { emit4($1 | $2 | ($5<<21) | ($3<<16) | ($7<<11)); }
	| OP_RS_RA_RB_MB5_ME5_C c GPR ',' GPR ',' GPR ',' u5 ',' u5 { emit4($1 | $2 | ($5<<21) | ($3<<16) | ($7<<11) | ($9<<6) | ($11<<1)); }  
	| OP_RS_RA_RB_MB6_C    c GPR ',' GPR ',' GPR ',' u6 { emit4($1 | $2 | ($5<<21) | ($3<<16) | ($7<<11) | (($9&0x1F)<<6) | (($9&0x20)>>0)); }
	| OP_RS_RA_RB_ME6_C    c GPR ',' GPR ',' GPR ',' u6 { emit4($1 | $2 | ($5<<21) | ($3<<16) | ($7<<11) | (($9&0x1F)<<6) | (($9&0x20)>>0)); }
	| OP_RS_RA_SH_MB5_ME5_C c GPR ',' GPR ',' u5 ',' u5 ',' u5 { emit4($1 | $2 | ($5<<21) | ($3<<16) | ($7<<11) | ($9<<6) | ($11<<1)); }  
	| OP_RS_RA_SH_MB6_SH_C  c GPR ',' GPR ',' u6 ',' u6 { emit4($1 | $2 | ($5<<21) | ($3<<16) | (($7&0x1F)<<11) | ($9<<6) | (($7&0x20)>>4)); }
	| OP_RS_RA_SH_ME6_SH_C  c GPR ',' GPR ',' u6 ',' u6 { emit4($1 | $2 | ($5<<21) | ($3<<16) | (($7&0x1F)<<11) | ($9<<6) | (($7&0x20)>>4)); }
	| OP_RS_RA_SH5_C       c GPR ',' GPR ',' u5       { emit4($1 | $2 | ($5<<21) | ($3<<16) | ($7<<11)); }
	| OP_RS_RA_SH6_C       c GPR ',' GPR ',' u6       { emit4($1 | $2 | ($5<<21) | ($3<<16) | (($7&0x1F)<<11) | (($7&0x20)>>4)); }
	| OP_RS_SPR            SPR ',' GPR                { emit4($1 | ($4<<21) | ($2<<11)); }
	| OP_TO_RA_RB          u5 ',' GPR ',' GPR         { emit4($1 | ($2<<21) | ($4<<16) | ($6<<11)); }
	| OP_TO_RA_SI          u5 ',' GPR ',' e16         { emit4($1 | ($2<<21) | ($4<<16) | $6); }
	| OP_LEV               u7                         { emit4($1 | ($2<<5)); }
	| OP_LIA               lia                        { emit4($1 | $2); }
	| OP_LIL               lil                        { emit4($1 | $2); }
	| OP_LA                la                         /* emitted in subrule */
	;

c
	: /* nothing */                          { $$ = 0; }
	| C                                      { $$ = 1; }
	;
	
e16
	: absexp
	{
		/* Allow signed or unsigned 16-bit values. */
		if (($1 < -0x8000) || ($1 > 0xffff))
			serror("16-bit value out of range");
		$$ = (uint16_t) $1;
	}
	;
		
u8
	: absexp
	{
		if (($1 < 0) || ($1 > 0xFF))
			serror("8-bit unsigned value out of range");
		$$ = $1;
	}
	;
	
u7
	: absexp
	{
		if (($1 < 0) || ($1 > 0x7F))
			serror("7-bit unsigned value out of range");
		$$ = $1;
	}
	;
	
u6
	: absexp
	{
		if (($1 < 0) || ($1 > 0x3F))
			serror("6-bit unsigned value out of range");
		$$ = $1;
	}
	;
	
u5
	: absexp
	{
		if (($1 < 0) || ($1 > 0x1F))
			serror("5-bit unsigned value out of range");
		$$ = $1;
	}
	;
	
u4
	: absexp
	{
		if (($1 < 0) || ($1 > 0xF))
			serror("4-bit unsigned value out of range");
		$$ = $1;
	}
	;
	
u1
	: absexp
	{
		if (($1 < 0) || ($1 > 1))
			serror("1-bit unsigned value out of range");
		$$ = $1;
	}
	;
	
u2
	: absexp
	{
		if (($1 < 0) || ($1 > 0x3))
			serror("2-bit unsigned value out of range");
		$$ = $1;
	}
	;
	
ds
	: e16
	{
		if ($1 & 3)
			serror("value must be 4-aligned");
		$$ = $1;
	}
	;
	
nb
	: absexp
	{
		if (($1 < 1) || ($1 > 32))
			serror("register count must be in the range 1..32");
	
		if ($1 == 32)
			$$ = 0;
		else
			$$ = $1;	
	}
	;
	
bdl
	: expr
	{
		int dist = $1.val - DOTVAL;
		fit(fitx(dist, 25));
		
		if (dist & 0x3)
			serror("jump targets must be 4-aligned");

		DOTVAL += 2;
		newrelo($1.typ, RELO2 | RELPC | FIXUPFLAGS);
		DOTVAL -= 2;
		$$ = dist & 0xFFFD;
	}
	;

bda
	: expr
	{
		int target = $1.val;
		fit(fitx(target, 16));
		
		if (target & 0x3)
			serror("jump targets must be 4-aligned");

		DOTVAL += 2;
		newrelo($1.typ, RELO2 | FIXUPFLAGS);
		DOTVAL -= 2;
		$$ = target & 0xFFFD;
	}
	;
	
la
	: GPR ',' expr
	{
		newrelo($3.typ, RELOPPC | FIXUPFLAGS);
		emit4((15<<26) | ($1<<21) | (0<<16)  | ($3.val >> 16)); /* addis */
		emit4((24<<26) | ($1<<21) | ($1<<16) | ($3.val & 0xffff)); /* ori */
	}
	;

lil
	: expr
	{
		int dist = $1.val - DOTVAL;
		fit(fitx(dist, 26));
		
		if (dist & 0x3)
			serror("jump targets must be 4-aligned");

		newrelo($1.typ, RELOPPC | RELPC | FIXUPFLAGS);
		$$ = dist & 0x03FFFFFD;
	}
	;
	
lia
	: expr
	{
		int target = $1.val;
		fit(fitx(target, 26));
		
		if (target & 0x3)
			serror("jump targets must be 4-aligned");

		newrelo($1.typ, RELOPPC | FIXUPFLAGS);
		$$ = target & 0x03FFFFFD;
	}
	;