Ensure CopyToReg nodes are always glued to the call instruction.

[oota-llvm.git] / lib / Target / TargetInstrInfo.cpp

diff --git a/lib/Target/TargetInstrInfo.cpp b/lib/Target/TargetInstrInfo.cpp
index d8d1578c72def0ce2e21f7e5461fe46ace0c3cc8..f1d1d07c38aef048793903f90f9516679825148c 100644 (file)
--- a/lib/Target/TargetInstrInfo.cpp
+++ b/lib/Target/TargetInstrInfo.cpp
@@ -12,40 +12,77 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Target/TargetInstrInfo.h"
-#include "llvm/Constant.h"
-#include "llvm/DerivedTypes.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCInstrItineraries.h"
+#include "llvm/Support/ErrorHandling.h"
+#include <cctype>
 using namespace llvm;
 
-/// findTiedToSrcOperand - Returns the operand that is tied to the specified
-/// dest operand. Returns -1 if there isn't one.
-int TargetInstrDescriptor::findTiedToSrcOperand(unsigned OpNum) const {
-  for (unsigned i = 0, e = numOperands; i != e; ++i) {
-    if (i == OpNum)
-      continue;
-    if (getOperandConstraint(i, TOI::TIED_TO) == (int)OpNum)
-      return i;
-  }
-  return -1;
+//===----------------------------------------------------------------------===//
+//  TargetInstrInfo
+//
+// Methods that depend on CodeGen are implemented in
+// TargetInstrInfoImpl.cpp. Invoking them without linking libCodeGen raises a
+// link error.
+// ===----------------------------------------------------------------------===//
+
+TargetInstrInfo::~TargetInstrInfo() {
 }
 
+const TargetRegisterClass*
+TargetInstrInfo::getRegClass(const MCInstrDesc &MCID, unsigned OpNum,
+                             const TargetRegisterInfo *TRI,
+                             const MachineFunction &MF) const {
+  if (OpNum >= MCID.getNumOperands())
+    return 0;
+
+  short RegClass = MCID.OpInfo[OpNum].RegClass;
+  if (MCID.OpInfo[OpNum].isLookupPtrRegClass())
+    return TRI->getPointerRegClass(MF, RegClass);
 
-TargetInstrInfo::TargetInstrInfo(const TargetInstrDescriptor* Desc,
-                                 unsigned numOpcodes)
-  : desc(Desc), NumOpcodes(numOpcodes) {
+  // Instructions like INSERT_SUBREG do not have fixed register classes.
+  if (RegClass < 0)
+    return 0;
+
+  // Otherwise just look it up normally.
+  return TRI->getRegClass(RegClass);
 }
 
-TargetInstrInfo::~TargetInstrInfo() {
+/// insertNoop - Insert a noop into the instruction stream at the specified
+/// point.
+void TargetInstrInfo::insertNoop(MachineBasicBlock &MBB,
+                                 MachineBasicBlock::iterator MI) const {
+  llvm_unreachable("Target didn't implement insertNoop!");
 }
 
-bool TargetInstrInfo::isUnpredicatedTerminator(const MachineInstr *MI) const {
-  const TargetInstrDescriptor *TID = MI->getInstrDescriptor();
-  if (TID->Flags & M_TERMINATOR_FLAG) {
-    // Conditional branch is a special case.
-    if ((TID->Flags & M_BRANCH_FLAG) != 0 && (TID->Flags & M_BARRIER_FLAG) == 0)
-      return true;
-    if ((TID->Flags & M_PREDICABLE) == 0)
-      return true;
-    return !isPredicated(MI);
+/// Measure the specified inline asm to determine an approximation of its
+/// length.
+/// Comments (which run till the next SeparatorString or newline) do not
+/// count as an instruction.
+/// Any other non-whitespace text is considered an instruction, with
+/// multiple instructions separated by SeparatorString or newlines.
+/// Variable-length instructions are not handled here; this function
+/// may be overloaded in the target code to do that.
+unsigned TargetInstrInfo::getInlineAsmLength(const char *Str,
+                                             const MCAsmInfo &MAI) const {
+
+
+  // Count the number of instructions in the asm.
+  bool atInsnStart = true;
+  unsigned Length = 0;
+  for (; *Str; ++Str) {
+    if (*Str == '\n' || strncmp(Str, MAI.getSeparatorString(),
+                                strlen(MAI.getSeparatorString())) == 0)
+      atInsnStart = true;
+    if (atInsnStart && !std::isspace(*Str)) {
+      Length += MAI.getMaxInstLength();
+      atInsnStart = false;
+    }
+    if (atInsnStart && strncmp(Str, MAI.getCommentString(),
+                               strlen(MAI.getCommentString())) == 0)
+      atInsnStart = false;
   }
-  return false;
+
+  return Length;
 }