nir: add a pass to lower some double operations

v2: Move to compiler/nir (Iago)
v3: Use nir_imm_int() to load the constants (Sam)
v4 (Sam):
  - Undo line-wrap (Jason).
  - Fix comment (Jason).
  - Improve generated code for get_signed_inf() function (Connor).

Signed-off-by: Samuel Iglesias Gonsálvez <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index b23130e205b..cbbf47e2570 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -2413,6 +2413,13 @@ void nir_lower_to_source_mods(nir_shader *shader);
 
 bool nir_lower_gs_intrinsics(nir_shader *shader);
 
+typedef enum {
+   nir_lower_drcp = (1 << 0),
+   nir_lower_dsqrt = (1 << 1),
+   nir_lower_drsq = (1 << 2),
+} nir_lower_doubles_options;
+
+void nir_lower_doubles(nir_shader *shader, nir_lower_doubles_options options);
 void nir_lower_double_pack(nir_shader *shader);
 
 bool nir_normalize_cubemap_coords(nir_shader *shader);