[llvm-commits] CVS: llvm/lib/Analysis/BasicAliasAnalysis.cpp ConstantFolding.cpp

[Nate Begeman]

Changes in directory llvm/lib/Analysis:

BasicAliasAnalysis.cpp updated: 1.75 -> 1.76
ConstantFolding.cpp updated: 1.1 -> 1.2
---
Log message:

Add bswap intrinsics as documented in the Language Reference


---
Diffs of the changes:  (+17 -1)

 BasicAliasAnalysis.cpp |    3 ++-
 ConstantFolding.cpp    |   15 +++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)


Index: llvm/lib/Analysis/BasicAliasAnalysis.cpp
diff -u llvm/lib/Analysis/BasicAliasAnalysis.cpp:1.75 llvm/lib/Analysis/BasicAliasAnalysis.cpp:1.76
--- llvm/lib/Analysis/BasicAliasAnalysis.cpp:1.75	Fri Nov 11 13:02:54 2005
+++ llvm/lib/Analysis/BasicAliasAnalysis.cpp	Fri Jan 13 19:25:24 2006
@@ -708,7 +708,8 @@
 static const char *DoesntAccessMemoryTable[] = {
   // LLVM intrinsics:
   "llvm.frameaddress", "llvm.returnaddress", "llvm.readport",
-  "llvm.isunordered", "llvm.sqrt", "llvm.ctpop", "llvm.ctlz", "llvm.cttz",
+  "llvm.isunordered", "llvm.sqrt", "llvm.bswap.i16", "llvm.bswap.i32",
+  "llvm.bswap.i64", "llvm.ctpop", "llvm.ctlz", "llvm.cttz",
 
   "abs", "labs", "llabs", "imaxabs", "fabs", "fabsf", "fabsl",
   "trunc", "truncf", "truncl", "ldexp",


Index: llvm/lib/Analysis/ConstantFolding.cpp
diff -u llvm/lib/Analysis/ConstantFolding.cpp:1.1 llvm/lib/Analysis/ConstantFolding.cpp:1.2
--- llvm/lib/Analysis/ConstantFolding.cpp:1.1	Thu Oct 27 11:00:11 2005
+++ llvm/lib/Analysis/ConstantFolding.cpp	Fri Jan 13 19:25:24 2006
@@ -37,6 +37,13 @@
   switch (F->getIntrinsicID()) {
   case Intrinsic::isunordered:
   case Intrinsic::sqrt:
+  case Intrinsic::bswap_i16:
+  case Intrinsic::bswap_i32:
+  case Intrinsic::bswap_i64:
+  // FIXME: these should be constant folded as well
+  //case Intrinsic::ctpop:
+  //case Intrinsic::ctlz:
+  //case Intrinsic::cttz:
     return true;
   default: break;
   }
@@ -142,6 +149,14 @@
         default:
           break;
       }
+    } else if (ConstantUInt *Op = dyn_cast<ConstantUInt>(Operands[0])) {
+      uint64_t V = Op->getValue();
+      if (Name == "llvm.bswap.i16")
+        return ConstantUInt::get(Ty, ByteSwap_16(V));
+      else if (Name == "llvm.bswap.i32")
+        return ConstantUInt::get(Ty, ByteSwap_32(V));
+      else if (Name == "llvm.bswap.i64")
+        return ConstantUInt::get(Ty, ByteSwap_64(V));
     }
   } else if (Operands.size() == 2) {
     if (ConstantFP *Op1 = dyn_cast<ConstantFP>(Operands[0])) {