[Mesa-dev] [PATCH 31/47] glsl: Add a lowering pass for 64-bit float d2f()

[Elie Tournier]

Signed-off-by: Elie Tournier <elie.tournier at collabora.com>
---
 src/compiler/glsl/ir_optimization.h        | 1 +
 src/compiler/glsl/lower_64bit.cpp          | 7 +++++++
 src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 3 ++-
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/compiler/glsl/ir_optimization.h b/src/compiler/glsl/ir_optimization.h
index c59d7f6ee2..2d5a210dca 100644
--- a/src/compiler/glsl/ir_optimization.h
+++ b/src/compiler/glsl/ir_optimization.h
@@ -72,6 +72,7 @@
 #define U2D                       (1U << 11)
 #define D2I                       (1U << 12)
 #define I2D                       (1U << 13)
+#define D2F                       (1U << 14)
 
 /**
  * \see class lower_packing_builtins_visitor
diff --git a/src/compiler/glsl/lower_64bit.cpp b/src/compiler/glsl/lower_64bit.cpp
index 570f997779..48c053b02b 100644
--- a/src/compiler/glsl/lower_64bit.cpp
+++ b/src/compiler/glsl/lower_64bit.cpp
@@ -436,6 +436,13 @@ lower_64bit_visitor::handle_rvalue(ir_rvalue **rvalue)
       }
       break;
 
+   case ir_unop_d2f:
+      if (lowering(D2F)) {
+         if (ir->type->base_type == GLSL_TYPE_FLOAT)
+            *rvalue = handle_op(ir, "__builtin_fp64_to_fp32", generate_ir::fp64_to_fp32);
+      }
+      break;
+
    case ir_unop_d2i:
       if (lowering(D2I)) {
          if (ir->type->base_type == GLSL_TYPE_INT)
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 1be223a3cb..53d85360b2 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -7069,7 +7069,8 @@ st_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
                                D2U |
                                U2D |
                                D2I |
-                               I2D;
+                               I2D |
+                               D2F;
          lower_64bit_double_instructions(ir, lower_inst);
       }
 
-- 
2.14.1