On 07/12/2012 10:43 AM, Paul Berry wrote:
> From the Ivy Bridge PRM, Vol4 Part3 p152:
>
> "The avg instruction performs component-wise integer average of
> src0 and src1 and stores the results in dst. An integer average
> uses integer upward rounding. It is equivalent to increment one to
> the addition of src0 and src1 and then apply an arithmetic right
> shift to this intermediate value."
> ---
> src/mesa/drivers/dri/i965/brw_eu.h | 1 +
> src/mesa/drivers/dri/i965/brw_eu_emit.c | 22 ++++++++++++++++++++++
> 2 files changed, 23 insertions(+), 0 deletions(-)
>
> diff --git a/src/mesa/drivers/dri/i965/brw_eu.h
> b/src/mesa/drivers/dri/i965/brw_eu.h
> index f25b09d..233b94c 100644
> --- a/src/mesa/drivers/dri/i965/brw_eu.h
> +++ b/src/mesa/drivers/dri/i965/brw_eu.h
> @@ -861,6 +861,7 @@ ALU2(RSL)
> ALU2(ASR)
> ALU2(JMPI)
> ALU2(ADD)
> +ALU2(AVG)
> ALU2(MUL)
> ALU1(FRC)
> ALU1(RNDD)
> diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c
> b/src/mesa/drivers/dri/i965/brw_eu_emit.c
> index 8de872e..93e84ae 100644
> --- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
> +++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
> @@ -929,6 +929,28 @@ struct brw_instruction *brw_ADD(struct brw_compile *p,
> return brw_alu2(p, BRW_OPCODE_ADD, dest, src0, src1);
> }
>
> +struct brw_instruction *brw_AVG(struct brw_compile *p,
> + struct brw_reg dest,
> + struct brw_reg src0,
> + struct brw_reg src1)
> +{
> + assert(dest.type == src0.type);
> + assert(src0.type == src1.type);
> + switch (src0.type) {
> + case BRW_REGISTER_TYPE_B:
> + case BRW_REGISTER_TYPE_UB:
> + case BRW_REGISTER_TYPE_W:
> + case BRW_REGISTER_TYPE_UW:
> + case BRW_REGISTER_TYPE_D:
> + case BRW_REGISTER_TYPE_UD:
> + break;
> + default:
> + assert(!"Bad type for brw_AVG");
> + }
> +
> + return brw_alu2(p, BRW_OPCODE_AVG, dest, src0, src1);
> +}
> +
> struct brw_instruction *brw_MUL(struct brw_compile *p,
> struct brw_reg dest,
> struct brw_reg src0,
Always nice to see the new instructions in use.
Patch 1 is:
Reviewed-by: Kenneth Graunke <kenn...@whitecape.org>
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