[Mesa-dev] [PATCH 34/47] glsl: Add a lowering pass for 64-bit float trunc()

[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 7a5a30541f..3566673d30 100644
--- a/src/compiler/glsl/ir_optimization.h
+++ b/src/compiler/glsl/ir_optimization.h
@@ -75,6 +75,7 @@
 #define D2F                       (1U << 14)
 #define F2D                       (1U << 15)
 #define SQRT64                    (1U << 16)
+#define TRUNC64                   (1U << 17)
 
 /**
  * \see class lower_packing_builtins_visitor
diff --git a/src/compiler/glsl/lower_64bit.cpp b/src/compiler/glsl/lower_64bit.cpp
index 3681c4f0c5..0bbcfacf2a 100644
--- a/src/compiler/glsl/lower_64bit.cpp
+++ b/src/compiler/glsl/lower_64bit.cpp
@@ -494,6 +494,13 @@ 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)
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 474e9bcdea..f746c5531a 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -7072,7 +7072,8 @@ st_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
                                I2D |
                                D2F |
                                F2D |
-                               SQRT64;
+                               SQRT64 |
+                               TRUNC64;
          lower_64bit_double_instructions(ir, lower_inst);
       }
 
-- 
2.14.1