[Mesa-dev] [PATCH 34/50] glsl: Add a lowering pass for 64-bit float trunc()

[Dave Airlie]

From: Elie Tournier <tournier.elie at gmail.com>

Signed-off-by: Elie Tournier <elie.tournier at collabora.com>
---
 src/compiler/glsl/ir_optimization.h | 3 ++-
 src/compiler/glsl/lower_64bit.cpp   | 7 +++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/compiler/glsl/ir_optimization.h b/src/compiler/glsl/ir_optimization.h
index 1b5d50a..6ef75f5 100644
--- a/src/compiler/glsl/ir_optimization.h
+++ b/src/compiler/glsl/ir_optimization.h
@@ -72,10 +72,11 @@
 #define D2F                       (1U << 13)
 #define F2D                       (1U << 14)
 #define SQRT64                    (1U << 15)
+#define TRUNC64                   (1U << 16)
 
 #define LOWER_ALL_DOUBLE_OPS (ABS64 | NEG64 | SIGN64 | EQ64 | LT64 | \
                               ADD64 | MUL64 | D2U | U2D | D2I | I2D | \
-                              D2F | F2D | SQRT64)
+                              D2F | F2D | SQRT64 | TRUNC64)
 
 /**
  * \see class lower_packing_builtins_visitor
diff --git a/src/compiler/glsl/lower_64bit.cpp b/src/compiler/glsl/lower_64bit.cpp
index 4920150..3c34211 100644
--- a/src/compiler/glsl/lower_64bit.cpp
+++ b/src/compiler/glsl/lower_64bit.cpp
@@ -482,6 +482,13 @@ lower_64bit_visitor::handle_rvalue(ir_rvalue **rvalue)
       }
       break;
 
+   case ir_unop_trunc:
+      if (lowering(TRUNC64)) {
+         if (ir->type->base_type == GLSL_TYPE_DOUBLE)
+            *rvalue = handle_op(ir, "__builtin_ftrunc64", generate_ir::ftrunc64);
+      }
+      break;
+
    case ir_unop_u2d:
       if (lowering(U2D)) {
          if (ir->type->base_type == GLSL_TYPE_DOUBLE)
-- 
2.9.5