From 59d1f5ff86705bb22669a115b1bb81538d24713a Mon Sep 17 00:00:00 2001
From: Yi-Hong Lyu <yi-hong@multicorewareinc.com>
Date: Sun, 13 Sep 2015 01:46:29 +0800
Subject: [PATCH] Handle Floating Point Constant Data Sequentials

Because of the imprecision of floating points.
Floating Point Constant (Vector/Data Sequential)
should be printed as the bit pattern of unsigned
value.
---
 lib/Target/CBackend/CBackend.cpp | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index 98aea1d..f08325a 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -250,6 +250,8 @@ namespace {
     void printContainedStructs(Type *Ty, SmallPtrSet<Type *, 16> &);
     void printFloatingPointConstants(Function &F);
     void printFloatingPointConstants(const Constant *C);
+    void
+    printFloatingPointConstantDataSequentials(const ConstantDataSequential *CDS);
     void printFunctionSignature(const Function *F, bool Prototype);
     bool okayToPrint(BasicBlock *BB);
     void printFunction(Function &);
@@ -2184,8 +2186,13 @@ void CWriter::printFloatingPointConstants(Function &F) {
   // precision.
   //
   for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
-       I != E; ++I)
-    printFloatingPointConstants(*I);
+       I != E; ++I) {
+    if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(*I)) {
+      printFloatingPointConstantDataSequentials(CDS);
+    } else {
+      printFloatingPointConstants(*I);
+    }
+  }
 
   Out << '\n';
 }
@@ -2244,6 +2251,12 @@ void CWriter::printFloatingPointConstants(const Constant *C) {
   }
 }
 
+void CWriter::printFloatingPointConstantDataSequentials(
+    const ConstantDataSequential *CDS) {
+  for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
+    printFloatingPointConstants(CDS->getElementAsConstant(i));
+  }
+}
 
 /// printSymbolTable - Run through symbol table looking for type names.  If a
 /// type name is found, emit its declaration...