From e420e9d48577de57f912ab39d59c2d1d4d14b8f6 Mon Sep 17 00:00:00 2001
From: michal <michal@michal-laptop.(none)>
Date: Sun, 28 Oct 2007 14:42:26 +0000
Subject: [PATCH] Declare temporaries in a more compact fashion.

The following declarations:
   DCL TEMP[0]
   DCL TEMP[1]
   DCL TEMP[2]
   DCL TEMP[4]
become:
   DCL TEMP[0..2]
   DCL TEMP[4]
---
 src/mesa/state_tracker/st_mesa_to_tgsi.c | 116 ++++++++++++++++---------------
 1 file changed, 61 insertions(+), 55 deletions(-)

diff --git a/src/mesa/state_tracker/st_mesa_to_tgsi.c b/src/mesa/state_tracker/st_mesa_to_tgsi.c
index 621159e..cb0c961 100644
--- a/src/mesa/state_tracker/st_mesa_to_tgsi.c
+++ b/src/mesa/state_tracker/st_mesa_to_tgsi.c
@@ -572,34 +572,36 @@ make_output_decl(
 
    return decl;
 }
-
-
-static struct tgsi_full_declaration
-make_temp_decl(GLuint index)
-{
-   struct tgsi_full_declaration decl;
-   decl = tgsi_default_full_declaration();
-   decl.Declaration.File = TGSI_FILE_TEMPORARY;
-   decl.Declaration.Declare = TGSI_DECLARE_RANGE;
-   decl.u.DeclarationRange.First = index;
-   decl.u.DeclarationRange.Last = index;
-   return decl;
-}
-
+
+
+static struct tgsi_full_declaration
+make_temp_decl(
+   GLuint start_index,
+   GLuint end_index )
+{
+   struct tgsi_full_declaration decl;
+   decl = tgsi_default_full_declaration();
+   decl.Declaration.File = TGSI_FILE_TEMPORARY;
+   decl.Declaration.Declare = TGSI_DECLARE_RANGE;
+   decl.u.DeclarationRange.First = start_index;
+   decl.u.DeclarationRange.Last = end_index;
+   return decl;
+}
+
 
 /**
  * Find the temporaries which are used in the given program.
- * Put the indices of the temporaries in 'tempsUsed'.
- * \return number of temporaries used
- */
-static GLuint
-find_temporaries(const struct gl_program *program,
-                 GLuint tempsUsed[MAX_PROGRAM_TEMPS])
-{
-   GLuint i, j, count;
-
-   for (i = 0; i < MAX_PROGRAM_TEMPS; i++)
-      tempsUsed[i] = GL_FALSE;
+ * Put the indices of the temporaries in 'tempsUsed'.
+ * \return number of temporaries used
+ */
+static void
+find_temporaries(const struct gl_program *program,
+                 GLboolean tempsUsed[MAX_PROGRAM_TEMPS])
+{
+   GLuint i, j;
+
+   for (i = 0; i < MAX_PROGRAM_TEMPS; i++)
+      tempsUsed[i] = GL_FALSE;
 
    for (i = 0; i < program->NumInstructions; i++) {
       const struct prog_instruction *inst = program->Instructions + i;
@@ -608,20 +610,12 @@ find_temporaries(const struct gl_program *program,
          if (inst->SrcReg[j].File == PROGRAM_TEMPORARY)
             tempsUsed[inst->SrcReg[j].Index] = GL_TRUE;
          if (inst->DstReg.File == PROGRAM_TEMPORARY)
-            tempsUsed[inst->DstReg.Index] = GL_TRUE;
-      }
-   }
-
-   /* convert flags to list of indices */
-   count = 0;
-   for (i = 0; i < MAX_PROGRAM_TEMPS; i++) {
-      if (tempsUsed[i])
-         tempsUsed[count++] = i;
-   }
-   return count;
-}
-
-
+            tempsUsed[inst->DstReg.Index] = GL_TRUE;
+      }
+   }
+}
+
+
 
 
 /**
@@ -781,22 +775,34 @@ tgsi_translate_mesa_program(
                                            maxTokens - ti );
       }
    }
-
-   /* temporary decls */
-   {
-      GLuint tempsUsed[MAX_PROGRAM_TEMPS];
-      uint numTemps = find_temporaries(program, tempsUsed);
-      for (i = 0; i < numTemps; i++) {
-         struct tgsi_full_declaration fulldecl;
-         fulldecl = make_temp_decl(tempsUsed[i]);
-         ti += tgsi_build_full_declaration(
-                                           &fulldecl,
-                                           &tokens[ti],
-                                           header,
-                                           maxTokens - ti );
-      }
-   }
-
+
+   /* temporary decls */
+   {
+      GLboolean tempsUsed[MAX_PROGRAM_TEMPS + 1];
+      GLboolean inside_range = GL_FALSE;
+      GLuint start_range;
+
+      find_temporaries(program, tempsUsed);
+      tempsUsed[MAX_PROGRAM_TEMPS] = GL_FALSE;
+      for (i = 0; i < MAX_PROGRAM_TEMPS + 1; i++) {
+         if (tempsUsed[i] && !inside_range) {
+            inside_range = GL_TRUE;
+            start_range = i;
+         }
+         else if (!tempsUsed[i] && inside_range) {
+            struct tgsi_full_declaration fulldecl;
+
+            inside_range = GL_FALSE;
+            fulldecl = make_temp_decl( start_range, i - 1 );
+            ti += tgsi_build_full_declaration(
+                                              &fulldecl,
+                                              &tokens[ti],
+                                              header,
+                                              maxTokens - ti );
+         }
+      }
+   }
+
    /* immediates/literals */
 #if EMIT_IMMEDIATES
    for (i = 0; i < program->Parameters->NumParameters; i++) {
-- 
2.7.4