From 5022ee43fc7916f16bdce8b076bad78fca262a62 Mon Sep 17 00:00:00 2001
From: Zack Rusin <zack@tungstengraphics.com>
Date: Wed, 24 Oct 2007 19:26:09 -0400
Subject: Make branching work :) Simply allow output variables as valid operand
 inputs when they've been assigned already.

---
 src/mesa/pipe/llvm/llvmtgsi.cpp |  4 ++--
 src/mesa/pipe/llvm/storage.cpp  | 28 ++++++++++++++++++++++++++++
 src/mesa/pipe/llvm/storage.h    |  1 +
 3 files changed, 31 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/mesa/pipe/llvm/llvmtgsi.cpp b/src/mesa/pipe/llvm/llvmtgsi.cpp
index ec284a624a..93dd2ea46a 100644
--- a/src/mesa/pipe/llvm/llvmtgsi.cpp
+++ b/src/mesa/pipe/llvm/llvmtgsi.cpp
@@ -195,8 +195,8 @@ translate_instruction(llvm::Module *module,
          val = storage->inputElement(src->SrcRegister.Index, indIdx);
       } else if (src->SrcRegister.File == TGSI_FILE_TEMPORARY) {
          val = storage->tempElement(src->SrcRegister.Index);
-      } else if (src->SrcRegister.File == TGSI_FILE_TEMPORARY) {
-         fprintf(stderr, "FIXME: do somethign with immediates?\n");
+      } else if (src->SrcRegister.File == TGSI_FILE_OUTPUT) {
+         val = storage->outputElement(src->SrcRegister.Index, indIdx);
       } else {
          fprintf(stderr, "ERROR: not supported llvm source %d\n", src->SrcRegister.File);
          return;
diff --git a/src/mesa/pipe/llvm/storage.cpp b/src/mesa/pipe/llvm/storage.cpp
index 6721f387c8..603053c0e8 100644
--- a/src/mesa/pipe/llvm/storage.cpp
+++ b/src/mesa/pipe/llvm/storage.cpp
@@ -310,3 +310,31 @@ void Storage::declareTemp(int idx)
 {
     m_temps[idx] = new AllocaInst(m_floatVecType, name("temp"), m_block);
 }
+
+llvm::Value * Storage::outputElement(int idx, llvm::Value *indIdx )
+{
+    GetElementPtrInst *getElem = 0;
+
+   if (indIdx) {
+      getElem = new GetElementPtrInst(m_IN,
+                                      BinaryOperator::create(Instruction::Add,
+                                                             indIdx,
+                                                             constantInt(idx),
+                                                             name("add"),
+                                                             m_block),
+                                      name("output_ptr"),
+                                      m_block);
+   } else {
+      getElem = new GetElementPtrInst(m_IN,
+                                      constantInt(idx),
+                                      name("output_ptr"),
+                                      m_block);
+   }
+
+   LoadInst *load = new LoadInst(getElem, name("output"),
+                                 false, m_block);
+   load->setAlignment(8);
+   m_inputs[idx] = load;
+
+   return load;
+}
diff --git a/src/mesa/pipe/llvm/storage.h b/src/mesa/pipe/llvm/storage.h
index 26b2579b07..dd5de35073 100644
--- a/src/mesa/pipe/llvm/storage.h
+++ b/src/mesa/pipe/llvm/storage.h
@@ -59,6 +59,7 @@ public:
    llvm::Constant *shuffleMask(int vec);
    llvm::Value *inputElement(int idx, llvm::Value *indIdx =0);
    llvm::Value *constElement(int idx, llvm::Value *indIdx =0);
+   llvm::Value *outputElement(int idx, llvm::Value *indIdx =0);
 
    llvm::Value *tempElement(int idx);
    void setTempElement(int idx, llvm::Value *val, int mask);
-- 
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