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Avoid shift/reduce conflict in predicate by making flagreg and subreg 1 token.

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Thanks to keithp for pointing out where the conflict was.
This commit is contained in:
Eric Anholt 2006-08-29 09:30:32 -07:00 committed by Damien Lespiau
parent 0ed5d93cc2
commit de1a889fe3
2 changed files with 13 additions and 10 deletions
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11
assembler/gram.y
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@ -651,16 +651,11 @@ accreg: ACCREG subregnum
} }
; ;
flagreg: FLAGREG subregnum flagreg: FLAGREG
{ {
if ($1 > 0) {
fprintf(stderr,
"flag register number %d out of range", $1);
YYERROR;
}
$$.reg_file = BRW_ARCHITECTURE_REGISTER_FILE; $$.reg_file = BRW_ARCHITECTURE_REGISTER_FILE;
$$.reg_nr = BRW_ARF_FLAG | $1; $$.reg_nr = BRW_ARF_FLAG | 0;
$$.subreg_nr = $2; $$.subreg_nr = $1;
} }
; ;

12
assembler/lex.l
View File

@ -136,8 +136,16 @@ int saved_state = INITIAL;
yylval.integer = atoi(yytext + 1); yylval.integer = atoi(yytext + 1);
return NOTIFYREG; return NOTIFYREG;
} }
"f"[0-9]+ { /* Unlike other registers, flagreg returns the subreg number in the lvalue
yylval.integer = atoi(yytext + 1); * rather than the reg number, to avoid a shift/reduce conflict in the
* predicate control.
*/
"f0.[0-9]+" {
yylval.integer = atoi(yytext + 3);
return FLAGREG;
}
"f0" {
yylval.integer = 0;
return FLAGREG; return FLAGREG;
} }
[gr][0-9]+ { [gr][0-9]+ {