[Mesa-dev] [PATCH 1/2] nir: Add a fquantize2f16 opcode

[Ian Romanick]

With the SPIR-V link added and the wording change suggested by Erik RE:
precision vs. number of bits in the type, this series is

Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

At some point we should add a debug mode that inserts these operations
in GLSL ES shaders around mediump and lowp types and operations.  Maybe
leave that as a GSoC or EVoC project...

On 01/12/2016 03:35 PM, Jason Ekstrand wrote:
> This opcode simply takes a 32-bit floating-point value and reduces its
> effective precision to 16 bits.
> ---
>  src/glsl/nir/nir_opcodes.py | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/src/glsl/nir/nir_opcodes.py b/src/glsl/nir/nir_opcodes.py
> index d31507f..9dbb341 100644
> --- a/src/glsl/nir/nir_opcodes.py
> +++ b/src/glsl/nir/nir_opcodes.py
> @@ -176,6 +176,7 @@ unop("ffloor", tfloat, "floorf(src0)")
>  unop("ffract", tfloat, "src0 - floorf(src0)")
>  unop("fround_even", tfloat, "_mesa_roundevenf(src0)")
>  
> +unop("fquantize2f16", tfloat, "_mesa_half_to_float(_mesa_float_to_half(src0))")
>  
>  # Trigonometric operations.
>  
>