[llvm] r274437 - [Hexagon] Create global std::map lazily.

[Benjamin Kramer via llvm-commits]

Author: d0k
Date: Sat Jul  2 08:05:12 2016
New Revision: 274437

URL: http://llvm.org/viewvc/llvm-project?rev=274437&view=rev
Log:
[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.

Modified:
    llvm/trunk/lib/Target/Hexagon/MCTargetDesc/HexagonMCDuplexInfo.cpp

Modified: llvm/trunk/lib/Target/Hexagon/MCTargetDesc/HexagonMCDuplexInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Hexagon/MCTargetDesc/HexagonMCDuplexInfo.cpp?rev=274437&r1=274436&r2=274437&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Hexagon/MCTargetDesc/HexagonMCDuplexInfo.cpp (original)
+++ llvm/trunk/lib/Target/Hexagon/MCTargetDesc/HexagonMCDuplexInfo.cpp Sat Jul  2 08:05:12 2016
@@ -80,9 +80,6 @@ static const std::pair<unsigned, unsigne
     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::isOrderedDuplex
   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) {