nir: add support for flushing to zero denorm constants

v2:
- Refactor conditions and shared function (Connor).
- Move code to nir_eval_const_opcode() (Connor).
- Don't flush to zero on fquantize2f16
  From Vulkan spec, VK_KHR_shader_float_controls section:

  "3) Do denorm and rounding mode controls apply to OpSpecConstantOp?

  RESOLVED: Yes, except when the opcode is OpQuantizeToF16."

v3:
- Fix bit size (Connor).
- Fix execution mode on nir_loop_analize (Connor).

v4:
- Adapt after API changes to nir_eval_const_opcode (Andres).

v5:
- Simplify constant_denorm_flush_to_zero (Caio).

v6:
- Adapt after API changes and to use the new constant
  constructors (Andres).
- Replace MAYBE_UNUSED with UNUSED as the first is going
  away (Andres).

v7:
- Adapt to newly added calls (Andres).
- Simplified the auxiliary to flush denorms to zero (Caio).
- Updated to renamed supported capabilities member (Andres).

Signed-off-by: Samuel Iglesias Gonsálvez <[email protected]>
Signed-off-by: Andres Gomez <[email protected]>
Reviewed-by: Connor Abbott <[email protected]> [v4]
Reviewed-by: Caio Marcelo de Oliveira Filho <[email protected]>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/compiler/spirv/spirv_to_nir.c b/src/compiler/spirv/spirv_to_nir.c
index f46b0a9bb02..54052062392 100644
--- a/src/compiler/spirv/spirv_to_nir.c
+++ b/src/compiler/spirv/spirv_to_nir.c
@@ -1896,7 +1896,9 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
          nir_const_value *srcs[3] = {
             src[0], src[1], src[2],
          };
-         nir_eval_const_opcode(op, val->constant->values, num_components, bit_size, srcs);
+         nir_eval_const_opcode(op, val->constant->values,
+                               num_components, bit_size, srcs,
+                               b->shader->info.float_controls_execution_mode);
          break;
       } /* default */
       }