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Change the rule for flag register

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The shift/reduce conflict mentioned in the comment has been fixed, so
flagreg can return the reg number in the lvalue now. In addition, it will
be easy to add support for flag register f1 on Ivy bridge

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
This commit is contained in:
Xiang, Haihao 2012-07-17 13:46:59 +08:00 committed by Damien Lespiau
parent 128053f120
commit f3f6ba24e6
2 changed files with 19 additions and 13 deletions
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18
assembler/src/gram.y
View File

@ -1847,12 +1847,24 @@ accreg: ACCREG subregnum
}
;
flagreg: FLAGREG
flagreg: FLAGREG subregnum
{
if ($1 > 0) {
fprintf(stderr,
"flag register number %d out of range\n", $1);
YYERROR;
}
if ($2 > 1) {
fprintf(stderr,
"flag subregister number %d out of range\n", $1);
YYERROR;
}
memset (&$$, '\0', sizeof ($$));
$$.reg_file = BRW_ARCHITECTURE_REGISTER_FILE;
$$.reg_nr = BRW_ARF_FLAG | 0;
$$.subreg_nr = $1;
$$.reg_nr = BRW_ARF_FLAG | $1;
$$.subreg_nr = $2;
}
;

14
assembler/src/lex.l
View File

@ -210,18 +210,12 @@ yylval.integer = BRW_CHANNEL_W;
yylval.integer = atoi(yytext + 1);
return NOTIFYREG;
}
/* Unlike other registers, flagreg returns the subreg number in the lvalue
* 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;
"f"[0-9] {
yylval.integer = atoi(yytext + 1);
return FLAGREG;
}
[gr][0-9]+ {
yylval.integer = atoi(yytext + 1);
return GENREG;