From d9881356a64b848dbae5fffd77fd93d0eb4247a3 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Mon, 23 Feb 2009 13:10:55 -0700
Subject: glsl: fix another swizzle-related bug

This fixes the case of "infinitely" nested swizzles such as EXPR.wzyx.yxwz.xxyz
This doesn't appear in typical shaders but with function inlining and the
compiler's internal use of swizzles it can happen.
New glean glsl1 test case added for this.
---
 src/mesa/shader/slang/slang_emit.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/src/mesa/shader/slang/slang_emit.c b/src/mesa/shader/slang/slang_emit.c
index c9d008c0af8..adb3bde9c4b 100644
--- a/src/mesa/shader/slang/slang_emit.c
+++ b/src/mesa/shader/slang/slang_emit.c
@@ -1379,6 +1379,7 @@ emit_copy(slang_emit_info *emitInfo, slang_ir_node *n)
 
 #if PEEPHOLE_OPTIMIZATIONS
    if (inst &&
+       (n->Children[1]->Opcode != IR_SWIZZLE) &&
        _slang_is_temp(emitInfo->vt, n->Children[1]->Store) &&
        (inst->DstReg.File == n->Children[1]->Store->File) &&
        (inst->DstReg.Index == n->Children[1]->Store->Index) &&
@@ -1395,13 +1396,9 @@ emit_copy(slang_emit_info *emitInfo, slang_ir_node *n)
        * becomes:
        *   MUL a, x, y;
        */
-      if (n->Children[1]->Opcode != IR_SWIZZLE)
-         _slang_free_temp(emitInfo->vt, n->Children[1]->Store);
-      *n->Children[1]->Store = *n->Children[0]->Store;
 
       /* fixup the previous instruction (which stored the RHS result) */
       assert(n->Children[0]->Store->Index >= 0);
-
       storage_to_dst_reg(&inst->DstReg, n->Children[0]->Store);
       return inst;
    }
@@ -1860,24 +1857,22 @@ emit_swizzle(slang_emit_info *emitInfo, slang_ir_node *n)
 
    inst = emit(emitInfo, n->Children[0]);
 
-   if (n->Children[0]->Opcode == IR_VAR ||
-       n->Children[0]->Opcode == IR_SWIZZLE ||
-       n->Children[0]->Opcode == IR_ELEMENT) {
-      /* We can resolve the swizzle now.  Other swizzles will be resolved
-       * in storage_to_src_reg().
-       */
+   assert(n->Children[0]->Store == n->Store->Parent);
+   assert(n->Store->Parent);
+
+   {
       const GLuint swizzle = n->Store->Swizzle;
-      assert(n->Store->Parent);
       /* new storage is parent storage with updated Swizzle + Size fields */
       _slang_copy_ir_storage(n->Store, n->Store->Parent);
       /* Apply this node's swizzle to parent's storage */
       n->Store->Swizzle = _slang_swizzle_swizzle(n->Store->Swizzle, swizzle);
       /* Update size */
       n->Store->Size = swizzle_size(n->Store->Swizzle);
-      assert(!n->Store->Parent);
-      assert(n->Store->Index >= 0);
    }
 
+   assert(!n->Store->Parent);
+   assert(n->Store->Index >= 0);
+
    return inst;
 }
 
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