Rename functions referring to VMOV immediates to refer to NEON "modified
immediate" operands. These functions have so far only been used for VMOV
but they also apply to other NEON instructions with modified immediate
operands. No functional changes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105969 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 00da962..5fb3856 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -2758,13 +2758,15 @@
return Result;
}
-/// isVMOVSplat - Check if the specified splat value corresponds to an immediate
-/// VMOV instruction. If so, return either the constant being splatted or the
-/// encoded value, depending on the DoEncode parameter. The format of the
-/// encoded value is: bit12=Op, bits11-8=Cmode, bits7-0=Immediate.
-static SDValue isVMOVSplat(uint64_t SplatBits, uint64_t SplatUndef,
- unsigned SplatBitSize, SelectionDAG &DAG,
- bool DoEncode) {
+/// isNEONModifiedImm - Check if the specified splat value corresponds to a
+/// valid vector constant for a NEON instruction with a "modified immediate"
+/// operand (e.g., VMOV). If so, return either the constant being
+/// splatted or the encoded value, depending on the DoEncode parameter. The
+/// format of the encoded value is: bit12=Op, bits11-8=Cmode,
+/// bits7-0=Immediate.
+static SDValue isNEONModifiedImm(uint64_t SplatBits, uint64_t SplatUndef,
+ unsigned SplatBitSize, SelectionDAG &DAG,
+ bool DoEncode) {
unsigned Op, Cmode, Imm;
EVT VT;
@@ -2885,11 +2887,12 @@
return DAG.getTargetConstant(SplatBits, VT);
}
-/// getVMOVImm - If this is a build_vector of constants which can be
-/// formed by using a VMOV instruction of the specified element size,
-/// return the constant being splatted. The ByteSize field indicates the
-/// number of bytes of each element [1248].
-SDValue ARM::getVMOVImm(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) {
+
+/// getNEONModImm - If this is a valid vector constant for a NEON instruction
+/// with a "modified immediate" operand (e.g., VMOV) of the specified element
+/// size, return the encoded value for that immediate. The ByteSize field
+/// indicates the number of bytes of each element [1248].
+SDValue ARM::getNEONModImm(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) {
BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(N);
APInt SplatBits, SplatUndef;
unsigned SplatBitSize;
@@ -2901,8 +2904,8 @@
if (SplatBitSize > ByteSize * 8)
return SDValue();
- return isVMOVSplat(SplatBits.getZExtValue(), SplatUndef.getZExtValue(),
- SplatBitSize, DAG, true);
+ return isNEONModifiedImm(SplatBits.getZExtValue(), SplatUndef.getZExtValue(),
+ SplatBitSize, DAG, true);
}
static bool isVEXTMask(const SmallVectorImpl<int> &M, EVT VT,
@@ -3142,9 +3145,10 @@
bool HasAnyUndefs;
if (BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, HasAnyUndefs)) {
if (SplatBitSize <= 64) {
- SDValue Val = isVMOVSplat(SplatBits.getZExtValue(),
- SplatUndef.getZExtValue(), SplatBitSize, DAG,
- false);
+ // Check if an immediate VMOV works.
+ SDValue Val = isNEONModifiedImm(SplatBits.getZExtValue(),
+ SplatUndef.getZExtValue(),
+ SplatBitSize, DAG, false);
if (Val.getNode())
return BuildSplat(Val, VT, DAG, dl);
}