[Hexagon] Create global std::map lazily.

This could of course be a simple binary search with no global state
involved at all if someone cares enough. Just don't make everyone
linking the hexagon backend pay for it on process startup and shutdown.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274437 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Hexagon/MCTargetDesc/HexagonMCDuplexInfo.cpp b/lib/Target/Hexagon/MCTargetDesc/HexagonMCDuplexInfo.cpp
index e6194f61a6ba919d793f649b5e58be731984637e..88336217cc8df4910d2415cda8697a01448b1d4b 100644 (file)
--- a/lib/Target/Hexagon/MCTargetDesc/HexagonMCDuplexInfo.cpp
+++ b/lib/Target/Hexagon/MCTargetDesc/HexagonMCDuplexInfo.cpp
@@ -80,9 +80,6 @@ static const std::pair<unsigned, unsigned> opcodeData[] = {
     std::make_pair((unsigned)V4_SS2_storewi0, 4096),
     std::make_pair((unsigned)V4_SS2_storewi1, 4352)};
 
-static std::map<unsigned, unsigned>
-    subinstOpcodeMap(std::begin(opcodeData), std::end(opcodeData));
-
 bool HexagonMCInstrInfo::isDuplexPairMatch(unsigned Ga, unsigned Gb) {
   switch (Ga) {
   case HexagonII::HSIG_None:
@@ -587,6 +584,9 @@ bool HexagonMCInstrInfo::isOrderedDuplexPair(MCInstrInfo const &MCII,
   unsigned MIaG = HexagonMCInstrInfo::getDuplexCandidateGroup(MIa),
            MIbG = HexagonMCInstrInfo::getDuplexCandidateGroup(MIb);
 
+  static std::map<unsigned, unsigned> subinstOpcodeMap(std::begin(opcodeData),
+                                                       std::end(opcodeData));
+
   // If a duplex contains 2 insns in the same group, the insns must be
   // ordered such that the numerically smaller opcode is in slot 1.
   if ((MIaG != HexagonII::HSIG_None) && (MIaG == MIbG) && bisReversable) {