- Implement X86ISelLowering::isShuffleMaskLegal(). We currently only support
splat and PSHUFD cases.
- Clean up shuffle / splat matching code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26954 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.h b/lib/Target/X86/X86ISelLowering.h
index b894457..e9ff015 100644
--- a/lib/Target/X86/X86ISelLowering.h
+++ b/lib/Target/X86/X86ISelLowering.h
@@ -179,6 +179,10 @@
/// Define some predicates that are used for node matching.
namespace X86 {
+ /// isPSHUFDMask - Return true if the specified VECTOR_SHUFFLE operand
+ /// specifies a shuffle of elements that is suitable for input to PSHUFD.
+ bool isPSHUFDMask(SDNode *N);
+
/// isSplatMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a splat of a single element.
bool isSplatMask(SDNode *N);
@@ -259,6 +263,11 @@
virtual bool isLegalAddressImmediate(int64_t V) const;
virtual bool isLegalAddressImmediate(GlobalValue *GV) const;
+ /// isShuffleMaskLegal - Targets can use this to indicate that they only
+ /// support *some* VECTOR_SHUFFLE operations, those with specific masks.
+ /// By default, if a target supports the VECTOR_SHUFFLE node, all mask values
+ /// are assumed to be legal.
+ virtual bool isShuffleMaskLegal(SDOperand Mask) const;
private:
// C Calling Convention implementation.
std::vector<SDOperand> LowerCCCArguments(Function &F, SelectionDAG &DAG);