From: John Thompson <John.Thompson.JTSoftware@gmail.com>
Date: Fri, 24 Sep 2010 22:24:05 +0000 (+0000)
Subject: Fix for test/CodeGen/PowerPC/2008-10-17-AsmMatchingOperands.ll crash.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=54584743f3827c7fd9e247db25cc5cfedaa9bab9;p=oota-llvm.git

Fix for test/CodeGen/PowerPC/2008-10-17-AsmMatchingOperands.ll crash.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114767 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index d971db54d3d..c316ef6c54a 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -5434,6 +5434,26 @@ void SelectionDAGBuilder::visitInlineAsm(ImmutableCallSite CS) {
   for (unsigned i = 0, e = ConstraintOperands.size(); i != e; ++i) {
     SDISelAsmOperandInfo &OpInfo = ConstraintOperands[i];
 
+    // If this is an output operand with a matching input operand, look up the
+    // matching input. If their types mismatch, e.g. one is an integer, the
+    // other is floating point, or their sizes are different, flag it as an
+    // error.
+    if (OpInfo.hasMatchingInput()) {
+      SDISelAsmOperandInfo &Input = ConstraintOperands[OpInfo.MatchingInput];
+      
+      if (OpInfo.ConstraintVT != Input.ConstraintVT) {
+        if ((OpInfo.ConstraintVT.isInteger() !=
+             Input.ConstraintVT.isInteger()) ||
+            (OpInfo.ConstraintVT.getSizeInBits() !=
+             Input.ConstraintVT.getSizeInBits())) {
+          report_fatal_error("Unsupported asm: input constraint"
+                             " with a matching output constraint of"
+                             " incompatible type!");
+        }
+        Input.ConstraintVT = OpInfo.ConstraintVT;
+      }
+    }
+
     // Compute the constraint code and ConstraintType to use.
     TLI.ComputeConstraintToUse(OpInfo, OpInfo.CallOperand, &DAG);