[Mesa-dev] [PATCH 1/2] glsl: add lowering passes for carry/borrow

[Chris Forbes]

On Tue, Apr 29, 2014 at 3:17 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:

> @@ -91,6 +92,10 @@
>   * Breaks ir_quadop_bitfield_insert into ir_binop_bfm (bitfield mask) and
>   * ir_triop_bfi (bitfield insert).
>   *
> + * CARRY_TO_ARITH:
> + * ---------------
> + * Converts ir_carry and ir_borrow into (x + y) > x and (x < y)
> + *
>   * Many GPUs implement the bitfieldInsert() built-in from ARB_gpu_shader_5
>   * with a pair of instructions.

This should be a few lines later, rather than in the middle of the
description of BITFIELD_INSERT_TO_BFM_BFI :)