From: Christoph Bumiller <e0425955@student.tuwien.ac.at>
Date: Tue, 15 Nov 2011 23:39:41 +0000 (+0100)
Subject: nv50/ir: fix insertHead and remove for BBs with PHI ops only
X-Git-Tag: mesa-9.0~2488
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fc740e7924dfa52a39de5f2b8031c2cded0fafb3;p=platform%2Fupstream%2Fmesa.git

nv50/ir: fix insertHead and remove for BBs with PHI ops only
---

diff --git a/src/gallium/drivers/nv50/codegen/nv50_ir_bb.cpp b/src/gallium/drivers/nv50/codegen/nv50_ir_bb.cpp
index 83938ed..fb41888 100644
--- a/src/gallium/drivers/nv50/codegen/nv50_ir_bb.cpp
+++ b/src/gallium/drivers/nv50/codegen/nv50_ir_bb.cpp
@@ -104,7 +104,7 @@ BasicBlock::insertHead(Instruction *inst)
          insertBefore(entry, inst);
       } else {
          if (phi) {
-            insertAfter(phi, inst);
+            insertAfter(exit, inst); // after last phi
          } else {
             assert(!exit);
             entry = exit = inst;
@@ -211,8 +211,15 @@ BasicBlock::remove(Instruction *insn)
    else
       exit = insn->prev;
 
-   if (insn == entry)
-      entry = insn->next ? insn->next : insn->prev;
+   if (insn == entry) {
+      if (insn->next)
+         entry = insn->next;
+      else
+      if (insn->prev && insn->prev->op != OP_PHI)
+         entry = insn->prev;
+      else
+         entry = NULL;
+   }
 
    if (insn == phi)
       phi = (insn->next && insn->next->op == OP_PHI) ? insn->next : 0;