On Mon, Jul 7, 2014 at 6:57 AM, Abdiel Janulgue
<abdiel.janul...@linux.intel.com> wrote:
> When sel conditon is bounded within 0 and 1.0. This allows code as:
> mov.sat a b
> sel.ge dst a 0.25F
>
> To be propagated as:
> sel.ge.sat dst b 0.25F
>
> Signed-off-by: Abdiel Janulgue <abdiel.janul...@linux.intel.com>
> ---
> src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp | 18 +++++++++++++++++-
> 1 file changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
> b/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
> index 28e59c6..f72ed23 100644
> --- a/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
> +++ b/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
> @@ -43,6 +43,7 @@ struct acp_entry : public exec_node {
> fs_reg dst;
> fs_reg src;
> enum opcode opcode;
> + bool saturate;
> };
>
> struct block_data {
> @@ -348,11 +349,26 @@ fs_visitor::try_copy_propagate(fs_inst *inst, int arg,
> acp_entry *entry)
> }
> }
>
> + if (entry->saturate) {
> + switch(inst->opcode) {
> + case BRW_OPCODE_SEL:
> + if (inst->src[1].file != IMM ||
> + inst->src[1].fixed_hw_reg.dw1.f < 0.0 ||
> + inst->src[1].fixed_hw_reg.dw1.f > 1.0) {
> + return false;
> + }
> + break;
> + default:
> + return false;
> + }
> + }
> +
> inst->src[arg].file = entry->src.file;
> inst->src[arg].reg = entry->src.reg;
> inst->src[arg].reg_offset = entry->src.reg_offset;
> inst->src[arg].subreg_offset = entry->src.subreg_offset;
> inst->src[arg].stride *= entry->src.stride;
> + inst->saturate = inst->saturate ? true : entry->saturate;
I'd probably write this as
inst->saturate = inst->saturate || entry->saturate;
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