Extend the vcmp/fcmp LLVM IR instructions to take vectors as arguments

and, if so, to return a vector of boolean as a result;

Extend the select LLVM IR instruction to allow you to specify a result
type which is a vector of boolean, in which case the result will be an
element-wise selection instead of choosing one vector or the other; and

Update LangRef.html to describe these changes.

This patch was contributed by Preston Gurd!

llvm-svn: 55969

1 files changed, 16 insertions, 2 deletions

diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index b8aab5a..19f5bea 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -641,7 +641,14 @@ static void WriteConstants(unsigned FirstVal, unsigned LastVal,
       case Instruction::FCmp:
       case Instruction::VICmp:
       case Instruction::VFCmp:
-        Code = bitc::CST_CODE_CE_CMP;
+        if (isa<VectorType>(C->getOperand(0)->getType())
+            && (CE->getOpcode() == Instruction::ICmp
+                || CE->getOpcode() == Instruction::FCmp)) {
+          // compare returning vector of Int1Ty
+          assert(0 && "Unsupported constant!");
+        } else {
+          Code = bitc::CST_CODE_CE_CMP;
+        }
         Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
         Record.push_back(VE.getValueID(C->getOperand(0)));
         Record.push_back(VE.getValueID(C->getOperand(1)));
@@ -765,7 +772,14 @@ static void WriteInstruction(const Instruction &I, unsigned InstID,
   case Instruction::FCmp:
   case Instruction::VICmp:
   case Instruction::VFCmp:
-    Code = bitc::FUNC_CODE_INST_CMP;
+    if (isa<VectorType>(I.getOperand(0)->getType())
+        && (I.getOpcode() == Instruction::ICmp
+            || I.getOpcode() == Instruction::FCmp)) {
+      // compare returning vector of Int1Ty
+      Code = bitc::FUNC_CODE_INST_VCMP;
+    } else {
+      Code = bitc::FUNC_CODE_INST_CMP;
+    }
     PushValueAndType(I.getOperand(0), InstID, Vals, VE);
     Vals.push_back(VE.getValueID(I.getOperand(1)));
     Vals.push_back(cast<CmpInst>(I).getPredicate());