Fix bugs which were introduced when support for base+index floating point loads

and stores was added.

- SelectAddr should return false if Parent is an unaligned f32 load or store.
- Only aligned load and store nodes should be matched to select reg+imm
  floating point instructions.
- MIPS does not have support for f64 unaligned load or store instructions.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151843 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 35 insertions, 10 deletions

diff --git a/lib/Target/Mips/MipsISelDAGToDAG.cpp b/lib/Target/Mips/MipsISelDAGToDAG.cpp
index b38f64f060..782d203704 100644
--- a/lib/Target/Mips/MipsISelDAGToDAG.cpp
+++ b/lib/Target/Mips/MipsISelDAGToDAG.cpp
@@ -202,6 +202,21 @@ bool MipsDAGToDAGISel::
 SelectAddr(SDNode *Parent, SDValue Addr, SDValue &Base, SDValue &Offset) {
   EVT ValTy = Addr.getValueType();
 
+  // If Parent is an unaligned f32 load or store, select a (base + index)
+  // floating point load/store instruction (luxc1 or suxc1).
+  const LSBaseSDNode* LS = 0;
+
+  if (Parent && (LS = dyn_cast<LSBaseSDNode>(Parent))) {
+    EVT VT = LS->getMemoryVT();
+
+    if (VT.getSizeInBits() / 8 > LS->getAlignment()) {
+      assert(TLI.allowsUnalignedMemoryAccesses(VT) &&
+             "Unaligned loads/stores not supported for this type.");
+      if (VT == MVT::f32)
+        return false;
+    }
+  }
+
   // if Address is FI, get the TargetFrameIndex.
   if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
     Base   = CurDAG->getTargetFrameIndex(FIN->getIndex(), ValTy);
@@ -259,11 +274,10 @@ SelectAddr(SDNode *Parent, SDValue Addr, SDValue &Base, SDValue &Offset) {
       }
     }
 
-    // If an indexed load/store can be emitted, return false.
-    if (const LSBaseSDNode* LS = dyn_cast<LSBaseSDNode>(Parent))
-      if ((LS->getMemoryVT() == MVT::f32 || LS->getMemoryVT() == MVT::f64) &&
-          Subtarget.hasMips32r2Or64())
-        return false;
+    // If an indexed floating point load/store can be emitted, return false.
+    if (LS && (LS->getMemoryVT() == MVT::f32 || LS->getMemoryVT() == MVT::f64) &&
+        Subtarget.hasMips32r2Or64())
+      return false;
   }
 
   Base   = Addr;
diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index f1b100d1bd..725e4a61a9 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -268,7 +268,6 @@ bool MipsTargetLowering::allowsUnalignedMemoryAccesses(EVT VT) const {
   case MVT::i16:
     return true;
   case MVT::f32:
-  case MVT::f64:
     return Subtarget->hasMips32r2Or64();
   default:
     return false;
diff --git a/lib/Target/Mips/MipsInstrFPU.td b/lib/Target/Mips/MipsInstrFPU.td
index cb97a506f7..fe5eaeccb0 100644
--- a/lib/Target/Mips/MipsInstrFPU.td
+++ b/lib/Target/Mips/MipsInstrFPU.td
@@ -85,13 +85,13 @@ def fpimm0neg : PatLeaf<(fpimm), [{
 // FP load.
 class FPLoad<bits<6> op, string opstr, RegisterClass RC, Operand MemOpnd>:
   FMem<op, (outs RC:$ft), (ins MemOpnd:$addr),
-      !strconcat(opstr, "\t$ft, $addr"), [(set RC:$ft, (load addr:$addr))],
+      !strconcat(opstr, "\t$ft, $addr"), [(set RC:$ft, (load_a addr:$addr))],
       IILoad>;
 
 // FP store.
 class FPStore<bits<6> op, string opstr, RegisterClass RC, Operand MemOpnd>:
   FMem<op, (outs), (ins RC:$ft, MemOpnd:$addr),
-      !strconcat(opstr, "\t$ft, $addr"), [(store RC:$ft, addr:$addr)],
+      !strconcat(opstr, "\t$ft, $addr"), [(store_a RC:$ft, addr:$addr)],
       IIStore>;
 
 // FP indexed load.
@@ -433,3 +433,16 @@ let Predicates = [IsFP64bit] in {
   def : Pat<(f32 (fround FGR64:$src)), (CVT_S_D64 FGR64:$src)>;
   def : Pat<(f64 (fextend FGR32:$src)), (CVT_D64_S FGR32:$src)>;
 }
+
+// Patterns for unaligned floating point loads and stores.
+let Predicates = [HasMips32r2Or64, NotN64] in {
+  def : Pat<(f32 (load_u CPURegs:$addr)), (LUXC1 CPURegs:$addr, ZERO)>; 
+  def : Pat<(store_u FGR32:$src, CPURegs:$addr),
+            (SUXC1 FGR32:$src, CPURegs:$addr, ZERO)>;
+}
+
+let Predicates = [IsN64] in {
+  def : Pat<(f32 (load_u CPU64Regs:$addr)), (LUXC1_P8 CPU64Regs:$addr, ZERO_64)>; 
+  def : Pat<(store_u FGR32:$src, CPU64Regs:$addr),
+            (SUXC1_P8 FGR32:$src, CPU64Regs:$addr, ZERO_64)>;
+}
diff --git a/lib/Target/Mips/MipsInstrFormats.td b/lib/Target/Mips/MipsInstrFormats.td
index 3292e86709..455530389e 100644
--- a/lib/Target/Mips/MipsInstrFormats.td
+++ b/lib/Target/Mips/MipsInstrFormats.td
@@ -310,7 +310,7 @@ class FFMADDSUB<bits<3> funct, bits<3> fmt, dag outs, dag ins, string asmstr,
 }
 
 // FP indexed load/store instructions.
-class FFMemIdx<bits<6> _funct, dag outs, dag ins, string asmstr,
+class FFMemIdx<bits<6> funct, dag outs, dag ins, string asmstr,
                list<dag> pattern> :
   MipsInst<outs, ins, asmstr, pattern, NoItinerary, FrmOther>
 {
@@ -318,7 +318,6 @@ class FFMemIdx<bits<6> _funct, dag outs, dag ins, string asmstr,
   bits<5>  index;
   bits<5>  fs;
   bits<5>  fd;
-  bits<6>  funct;
 
   let Opcode = 0x13;