Reviewed-by: Jason Ekstrand
On Tue, Jan 15, 2019 at 7:54 AM Iago Toral Quiroga
wrote:
> From the Skylake PRM, Extended Math Function:
>
> "The execution size must be no more than 8 when half-floats
>are used in source or destination operand."
>
> Earlier generations do not support Extended Math with half-float.
>
> v2:
> - Rewrite the code to make it more readable (Jason).
>
> v3:
> - Use if-ladders or just if+return exclusively (Topi).
>
> Reviewed-by: Topi Pohjolainen (v1)
> ---
> src/intel/compiler/brw_fs.cpp | 27 ++-
> 1 file changed, 18 insertions(+), 9 deletions(-)
>
> diff --git a/src/intel/compiler/brw_fs.cpp b/src/intel/compiler/brw_fs.cpp
> index 0359eb079f7..0b3ec94e2d2 100644
> --- a/src/intel/compiler/brw_fs.cpp
> +++ b/src/intel/compiler/brw_fs.cpp
> @@ -5493,18 +5493,27 @@ get_lowered_simd_width(const struct
> gen_device_info *devinfo,
> case SHADER_OPCODE_EXP2:
> case SHADER_OPCODE_LOG2:
> case SHADER_OPCODE_SIN:
> - case SHADER_OPCODE_COS:
> + case SHADER_OPCODE_COS: {
>/* Unary extended math instructions are limited to SIMD8 on Gen4 and
> - * Gen6.
> + * Gen6. Extended Math Function is limited to SIMD8 with half-float.
> */
> - return (devinfo->gen >= 7 ? MIN2(16, inst->exec_size) :
> - devinfo->gen == 5 || devinfo->is_g4x ? MIN2(16,
> inst->exec_size) :
> - MIN2(8, inst->exec_size));
> + if (devinfo->gen == 6 || (devinfo->gen == 4 && !devinfo->is_g4x))
> + return MIN2(8, inst->exec_size);
> + if (inst->dst.type == BRW_REGISTER_TYPE_HF)
> + return MIN2(8, inst->exec_size);
> + return MIN2(16, inst->exec_size);
> + }
>
> - case SHADER_OPCODE_POW:
> - /* SIMD16 is only allowed on Gen7+. */
> - return (devinfo->gen >= 7 ? MIN2(16, inst->exec_size) :
> - MIN2(8, inst->exec_size));
> + case SHADER_OPCODE_POW: {
> + /* SIMD16 is only allowed on Gen7+. Extended Math Function is
> limited
> + * to SIMD8 with half-float
> + */
> + if (devinfo->gen < 7)
> + return MIN2(8, inst->exec_size);
> + if (inst->dst.type == BRW_REGISTER_TYPE_HF)
> + return MIN2(8, inst->exec_size);
> + return MIN2(16, inst->exec_size);
> + }
>
> case SHADER_OPCODE_INT_QUOTIENT:
> case SHADER_OPCODE_INT_REMAINDER:
> --
> 2.17.1
>
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