[Mesa-dev] [PATCH 1/2] i965/emit: Add assertions for accumulator restrictions

[Kenneth Graunke]

On Thursday, September 10, 2015 04:24:50 PM Jason Ekstrand wrote:
> ---
>  src/mesa/drivers/dri/i965/brw_eu_emit.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
> index 637fd07..b2f7409 100644
> --- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
> +++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
> @@ -235,6 +235,15 @@ validate_reg(const struct brw_device_info *devinfo,
>         reg.file == BRW_ARF_NULL)
>        return;
>  
> +   /* From the IBV PRM Vol. 4, Pt. 3, Section 3.3.3.5:

                  IVB

> +    *
> +    * Swizzling is not allowed when an accumulator is used as an implicit
> +    * source or an explicit source in an instruction.

"" please

> +    */
> +   if (reg.file == BRW_ARCHITECTURE_REGISTER_FILE &&
> +       reg.nr == BRW_ARF_ACCUMULATOR)
> +      assert(reg.dw1.bits.swizzle == BRW_SWIZZLE_XYZW);
> +
>     assert(reg.hstride >= 0 && reg.hstride < ARRAY_SIZE(hstride_for_reg));
>     hstride = hstride_for_reg[reg.hstride];
>  
> @@ -443,6 +452,13 @@ brw_set_src1(struct brw_codegen *p, brw_inst *inst, struct brw_reg reg)
>     if (reg.file != BRW_ARCHITECTURE_REGISTER_FILE)
>        assert(reg.nr < 128);
>  
> +   /* From the IBV PRM Vol. 4, Pt. 3, Section 3.3.3.5:

                  IVB
 
> +    *
> +    * Accumulator registers may be accessed explicitly as src0 operands only.
> +    */

"" please

> +   assert(reg.file != BRW_ARCHITECTURE_REGISTER_FILE ||
> +          reg.nr != BRW_ARF_ACCUMULATOR);
> +
>     gen7_convert_mrf_to_grf(p, &reg);
>     assert(reg.file != BRW_MESSAGE_REGISTER_FILE);
>  
> 

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
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