[Mesa-dev] [PATCH 05/14] glsl_to_tgsi: reduce the size of glsl_to_tgsi_instruction using bitfields

[Marek Olšák]

From: Marek Olšák <marek.olsak at amd.com>

sizeof(glsl_to_tgsi_instruction): 464 -> 416
---
 src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 33 +++++++++++++++---------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 78d9409..b3654fe 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -263,42 +263,41 @@ st_dst_reg::st_dst_reg(st_src_reg reg)
    this->index2D = reg.index2D;
    this->reladdr2 = reg.reladdr2;
    this->has_index2 = reg.has_index2;
    this->array_id = reg.array_id;
 }
 
 class glsl_to_tgsi_instruction : public exec_node {
 public:
    DECLARE_RALLOC_CXX_OPERATORS(glsl_to_tgsi_instruction)
 
-   unsigned op;
    st_dst_reg dst[2];
    st_src_reg src[4];
-   /** Pointer to the ir source this tree came from for debugging */
-   ir_instruction *ir;
-   GLboolean cond_update;
-   bool saturate;
-   bool is_64bit_expanded;
    st_src_reg sampler; /**< sampler register */
-   int sampler_base;
-   int sampler_array_size; /**< 1-based size of sampler array, 1 if not array */
-   int tex_target; /**< One of TEXTURE_*_INDEX */
-   glsl_base_type tex_type;
-   GLboolean tex_shadow;
-   unsigned image_format;
-
    st_src_reg tex_offsets[MAX_GLSL_TEXTURE_OFFSET];
-   unsigned tex_offset_num_offset;
-   int dead_mask; /**< Used in dead code elimination */
-
    st_src_reg buffer; /**< buffer register */
-   unsigned buffer_access; /**< buffer access type */
+
+   /** Pointer to the ir source this tree came from for debugging */
+   ir_instruction *ir;
+
+   unsigned op:8; /**< TGSI opcode */
+   unsigned saturate:1;
+   unsigned is_64bit_expanded:1;
+   unsigned sampler_base:5;
+   unsigned sampler_array_size:6; /**< 1-based size of sampler array, 1 if not array */
+   unsigned tex_target:4; /**< One of TEXTURE_*_INDEX */
+   glsl_base_type tex_type:4;
+   unsigned tex_shadow:1;
+   unsigned image_format:9;
+   unsigned tex_offset_num_offset:3;
+   unsigned dead_mask:4; /**< Used in dead code elimination */
+   unsigned buffer_access:3; /**< buffer access type */
 
    class function_entry *function; /* Set on TGSI_OPCODE_CAL or TGSI_OPCODE_BGNSUB */
    const struct tgsi_opcode_info *info;
 };
 
 class variable_storage : public exec_node {
 public:
    variable_storage(ir_variable *var, gl_register_file file, int index,
                     unsigned array_id = 0)
       : file(file), index(index), component(0), var(var), array_id(array_id)
-- 
2.7.4