Mesa (master): i965: Fix up the FS backend for the variable array indexing pass.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 719f84d9aba6b016e1069e0461cbfc4211f5a3b5
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=719f84d9aba6b016e1069e0461cbfc4211f5a3b5

Author: Eric Anholt <eric at anholt.net>
Date:   Mon Sep 27 22:15:36 2010 -0700

i965: Fix up the FS backend for the variable array indexing pass.

We need to re-run channel expressions afterwards as it generates new
vector expressions, and we need to successfully support conditional
assignment (brw_CMP takes 2 operands, not 1).

---

 src/mesa/drivers/dri/i965/brw_fs.cpp |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 27ea912..78c1bc6 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -135,12 +135,12 @@ brw_link_shader(GLcontext *ctx, struct gl_shader_program *prog)
 	 do_sub_to_add_neg(shader->ir);
 	 do_explog_to_explog2(shader->ir);
 
-	 brw_do_channel_expressions(shader->ir);
-	 brw_do_vector_splitting(shader->ir);
-
 	 do {
 	    progress = false;
 
+	    brw_do_channel_expressions(shader->ir);
+	    brw_do_vector_splitting(shader->ir);
+
 	    progress = do_lower_jumps(shader->ir, true, true,
 				      true, /* main return */
 				      false, /* continue */
@@ -520,6 +520,14 @@ fs_reg::fs_reg(class fs_visitor *v, const struct glsl_type *type)
    case GLSL_TYPE_UINT:
       this->type = BRW_REGISTER_TYPE_UD;
       break;
+   case GLSL_TYPE_ARRAY:
+   case GLSL_TYPE_STRUCT:
+      /* These should be overridden with the type of the member when
+       * dereferenced into.  BRW_REGISTER_TYPE_UD seems like a likely
+       * way to trip up if we don't.
+       */
+      this->type =  BRW_REGISTER_TYPE_UD;
+      break;
    default:
       assert(!"not reached");
       this->type =  BRW_REGISTER_TYPE_F;
@@ -877,7 +885,7 @@ fs_visitor::visit(ir_assignment *ir)
    if (ir->condition) {
       /* Get the condition bool into the predicate. */
       ir->condition->accept(this);
-      inst = emit(fs_inst(BRW_OPCODE_CMP, this->result, fs_reg(0)));
+      inst = emit(fs_inst(BRW_OPCODE_CMP, reg_null, this->result, fs_reg(0)));
       inst->conditional_mod = BRW_CONDITIONAL_NZ;
    }