Re: [PATCH i-g-t] assembler/: Fix lex warnings for %empty and %nonassoc.

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On Thu, May 19, 2016 at 12:28:10PM +0100, Damien Lespiau wrote:
> On Mon, May 16, 2016 at 01:39:10PM +0300, Marius Vlad wrote:
> > Signed-off-by: Marius Vlad <marius.c.vlad@xxxxxxxxx>
> > ---
> >  assembler/gram.y | 74 ++++++++++++++++++++++++++++----------------------------
> >  1 file changed, 37 insertions(+), 37 deletions(-)
> 
> The only way to test the change is to regenerate the vaapi shaders from
> source and check for differences in the generated opcodes.
> 
>   https://cgit.freedesktop.org/vaapi/intel-driver/
> 
> If all the shaders do compile and there's no difference in the generated
> code, this is:
> 
> Acked-by: Damien Lespiau <damien.lespiau@xxxxxxxxx>
> 
> -- 
> Damien
> 

Didn't we have something like this in the test/ directory?

> > 
> > diff --git a/assembler/gram.y b/assembler/gram.y
> > index 23e1a57..15b8b64 100644
> > --- a/assembler/gram.y
> > +++ b/assembler/gram.y
> > @@ -509,15 +509,15 @@ static void resolve_subnr(struct brw_reg *reg)
> >  %token <integer> BASE ELEMENTSIZE SRCREGION DSTREGION TYPE
> >  
> >  %token <integer> DEFAULT_EXEC_SIZE_PRAGMA DEFAULT_REG_TYPE_PRAGMA
> > -%nonassoc SUBREGNUM
> > -%nonassoc SNDOPR
> > +%precedence SUBREGNUM
> > +%precedence SNDOPR
> >  %left  PLUS MINUS
> >  %left  MULTIPLY DIVIDE
> > -%right UMINUS
> > -%nonassoc DOT
> > -%nonassoc STR_SYMBOL_REG
> > -%nonassoc EMPTEXECSIZE
> > -%nonassoc LPAREN
> > +%precedence UMINUS
> > +%precedence DOT
> > +%precedence STR_SYMBOL_REG
> > +%precedence EMPTEXECSIZE
> > +%precedence LPAREN
> >  
> >  %type <integer> exp sndopr
> >  %type <integer> simple_int
> > @@ -655,7 +655,7 @@ declare_elementsize:  ELEMENTSIZE EQ exp
> >  		   $$ = $3;
> >  		}
> >  ;
> > -declare_srcregion: /* empty */
> > +declare_srcregion: %empty /* empty */
> >  		{
> >  		  /* XXX is this default correct?*/
> >  		  memset (&$$, '\0', sizeof ($$));
> > @@ -668,7 +668,7 @@ declare_srcregion: /* empty */
> >  		    $$ = $3;
> >  		}
> >  ;
> > -declare_dstregion: /* empty */
> > +declare_dstregion: %empty /* empty */
> >  		{
> >  		    $$ = 1;
> >  		}
> > @@ -1962,20 +1962,20 @@ msgtarget:	NULL_TOKEN
> >  ;
> >  
> >  urb_allocate:	ALLOCATE { $$ = 1; }
> > -		| /* empty */ { $$ = 0; }
> > +		| %empty /* empty */ { $$ = 0; }
> >  ;
> >  
> >  urb_used:	USED { $$ = 1; }
> > -		| /* empty */ { $$ = 0; }
> > +		| %empty /* empty */ { $$ = 0; }
> >  ;
> >  
> >  urb_complete:	COMPLETE { $$ = 1; }
> > -		| /* empty */ { $$ = 0; }
> > +		| %empty /* empty */ { $$ = 0; }
> >  ;
> >  
> >  urb_swizzle:	TRANSPOSE { $$ = BRW_URB_SWIZZLE_TRANSPOSE; }
> >  		| INTERLEAVE { $$ = BRW_URB_SWIZZLE_INTERLEAVE; }
> > -		| /* empty */ { $$ = BRW_URB_SWIZZLE_NONE; }
> > +		| %empty /* empty */ { $$ = BRW_URB_SWIZZLE_NONE; }
> >  ;
> >  
> >  sampler_datatype:
> > @@ -1988,11 +1988,11 @@ math_function:	INV | LOG | EXP | SQRT | POW | SIN | COS | SINCOS | INTDIV
> >  		| INTMOD | INTDIVMOD
> >  ;
> >  
> > -math_signed:	/* empty */ { $$ = 0; }
> > +math_signed:	%empty /* empty */ { $$ = 0; }
> >  		| SIGNED { $$ = 1; }
> >  ;
> >  
> > -math_scalar:	/* empty */ { $$ = 0; }
> > +math_scalar:	%empty /* empty */ { $$ = 0; }
> >  		| SCALAR { $$ = 1; }
> >  ;
> >  
> > @@ -2374,7 +2374,7 @@ addrparam:	addrreg COMMA immaddroffset
> >  /* The immaddroffset provides an immediate offset value added to the addresses
> >   * from the address register in register-indirect register access.
> >   */
> > -immaddroffset:	/* empty */ { $$ = 0; }
> > +immaddroffset:	%empty /* empty */ { $$ = 0; }
> >  		| exp
> >  ;
> >  
> > @@ -2384,7 +2384,7 @@ subregnum:	DOT exp
> >  		{
> >  		  $$ = $2;
> >  		}
> > -		|  %prec SUBREGNUM
> > +		|  %empty %prec SUBREGNUM
> >  		{
> >  		  /* Default to subreg 0 if unspecified. */
> >  		  $$ = 0;
> > @@ -2687,7 +2687,7 @@ relativelocation2:
> >  ;
> >  
> >  /* 1.4.7: Regions */
> > -dstregion:	/* empty */
> > +dstregion:	%empty /* empty */
> >  		{
> >  		  $$ = DEFAULT_DSTREGION;
> >  		}
> > @@ -2703,7 +2703,7 @@ dstregion:	/* empty */
> >  		}
> >  ;
> >  
> > -region:		/* empty */
> > +region:		%empty /* empty */
> >  		{
> >  		  /* XXX is this default value correct?*/
> >  		  memset (&$$, '\0', sizeof ($$));
> > @@ -2757,7 +2757,7 @@ indirectregion:	region | region_wh
> >  /* regtype returns an integer register type suitable for inserting into an
> >   * instruction.
> >   */
> > -regtype:	/* empty */
> > +regtype:	%empty /* empty */
> >  		{ $$.type = program_defaults.register_type;$$.is_default = 1;}
> >  		| TYPE_F { $$.type = BRW_REGISTER_TYPE_F;$$.is_default = 0; }
> >  		| TYPE_UD { $$.type = BRW_REGISTER_TYPE_UD;$$.is_default = 0; }
> > @@ -2768,7 +2768,7 @@ regtype:	/* empty */
> >  		| TYPE_B { $$.type = BRW_REGISTER_TYPE_B;$$.is_default = 0; }
> >  ;
> >  
> > -srcimmtype:	/* empty */
> > +srcimmtype:	%empty /* empty */
> >  		{
> >  		    /* XXX change to default when pragma parse is done */
> >  		   $$ = BRW_REGISTER_TYPE_D;
> > @@ -2786,7 +2786,7 @@ srcimmtype:	/* empty */
> >  /* Returns the swizzle control for an align16 instruction's source operand
> >   * in the src0 fields.
> >   */
> > -swizzle:	/* empty */
> > +swizzle:	%empty /* empty */
> >  		{
> >  		  $$.reg.dw1.bits.swizzle = BRW_SWIZZLE_NOOP;
> >  		}
> > @@ -2807,7 +2807,7 @@ chansel:	X | Y | Z | W
> >  /* Returns a partially completed struct brw_reg, with just the writemask bits
> >   * filled out.
> >   */
> > -writemask:	/* empty */
> > +writemask:	%empty /* empty */
> >  		{
> >  		  $$.dw1.bits.writemask = BRW_WRITEMASK_XYZW;
> >  		}
> > @@ -2817,19 +2817,19 @@ writemask:	/* empty */
> >  		}
> >  ;
> >  
> > -writemask_x:	/* empty */ { $$ = 0; }
> > +writemask_x:	%empty /* empty */ { $$ = 0; }
> >  		 | X { $$ = 1 << BRW_CHANNEL_X; }
> >  ;
> >  
> > -writemask_y:	/* empty */ { $$ = 0; }
> > +writemask_y:	%empty /* empty */ { $$ = 0; }
> >  		 | Y { $$ = 1 << BRW_CHANNEL_Y; }
> >  ;
> >  
> > -writemask_z:	/* empty */ { $$ = 0; }
> > +writemask_z:	%empty /* empty */ { $$ = 0; }
> >  		 | Z { $$ = 1 << BRW_CHANNEL_Z; }
> >  ;
> >  
> > -writemask_w:	/* empty */ { $$ = 0; }
> > +writemask_w:	%empty /* empty */ { $$ = 0; }
> >  		 | W { $$ = 1 << BRW_CHANNEL_W; }
> >  ;
> >  
> > @@ -2839,7 +2839,7 @@ imm32:		exp { $$.r = imm32_d; $$.u.d = $1; }
> >  ;
> >  
> >  /* 1.4.12: Predication and modifiers */
> > -predicate:	/* empty */
> > +predicate:	%empty /* empty */
> >  		{
> >  		  $$.pred_control = BRW_PREDICATE_NONE;
> >  		  $$.flag_reg_nr = 0;
> > @@ -2855,12 +2855,12 @@ predicate:	/* empty */
> >  		}
> >  ;
> >  
> > -predstate:	/* empty */ { $$ = 0; }
> > +predstate:	%empty /* empty */ { $$ = 0; }
> >  		| PLUS { $$ = 0; }
> >  		| MINUS { $$ = 1; }
> >  ;
> >  
> > -predctrl:	/* empty */ { $$ = BRW_PREDICATE_NORMAL; }
> > +predctrl:	%empty /* empty */ { $$ = BRW_PREDICATE_NORMAL; }
> >  		| DOT X { $$ = BRW_PREDICATE_ALIGN16_REPLICATE_X; }
> >  		| DOT Y { $$ = BRW_PREDICATE_ALIGN16_REPLICATE_Y; }
> >  		| DOT Z { $$ = BRW_PREDICATE_ALIGN16_REPLICATE_Z; }
> > @@ -2877,15 +2877,15 @@ predctrl:	/* empty */ { $$ = BRW_PREDICATE_NORMAL; }
> >  		| ALL16H { $$ = BRW_PREDICATE_ALIGN1_ALL16H; }
> >  ;
> >  
> > -negate:		/* empty */ { $$ = 0; }
> > +negate:		%empty /* empty */ { $$ = 0; }
> >  		| MINUS { $$ = 1; }
> >  ;
> >  
> > -abs:		/* empty */ { $$ = 0; }
> > +abs:		%empty /* empty */ { $$ = 0; }
> >  		| ABS { $$ = 1; }
> >  ;
> >  
> > -execsize:	/* empty */ %prec EMPTEXECSIZE
> > +execsize:	%empty /* empty */ %prec EMPTEXECSIZE
> >  		{
> >  		  $$ = ffs(program_defaults.execute_size) - 1;
> >  		}
> > @@ -2902,7 +2902,7 @@ execsize:	/* empty */ %prec EMPTEXECSIZE
> >  		}
> >  ;
> >  
> > -saturate:	/* empty */ { $$ = BRW_INSTRUCTION_NORMAL; }
> > +saturate:	%empty /* empty */ { $$ = BRW_INSTRUCTION_NORMAL; }
> >  		| SATURATE { $$ = BRW_INSTRUCTION_SATURATE; }
> >  ;
> >  conditionalmodifier: condition 
> > @@ -2918,7 +2918,7 @@ conditionalmodifier: condition
> >  		    $$.flag_subreg_nr = $3.subnr;
> >  		}
> >  
> > -condition: /* empty */    { $$ = BRW_CONDITIONAL_NONE; }
> > +condition: %empty /* empty */    { $$ = BRW_CONDITIONAL_NONE; }
> >  		| ZERO
> >  		| EQUAL
> >  		| NOT_ZERO
> > @@ -2933,7 +2933,7 @@ condition: /* empty */    { $$ = BRW_CONDITIONAL_NONE; }
> >  ;
> >  
> >  /* 1.4.13: Instruction options */
> > -instoptions:	/* empty */
> > +instoptions:	%empty /* empty */
> >  		{ memset(&$$, 0, sizeof($$)); }
> >  		| LCURLY instoption_list RCURLY
> >  		{ $$ = $2; }
> > @@ -2949,7 +2949,7 @@ instoption_list:instoption_list COMMA instoption
> >  		  $$ = $1;
> >  		  add_option(&$$, $2);
> >  		}
> > -		| /* empty, header defaults to zeroes. */
> > +		| %empty /* empty, header defaults to zeroes. */
> >  		{
> >  		  memset(&$$, 0, sizeof($$));
> >  		}
> > -- 
> > 2.8.1
> > 

-- 
Ben Widawsky, Intel Open Source Technology Center
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