Flatten some of the arrays in the X86 disassembler tables to reduce space needed to store pointers on 64-bit hosts and reduce relocations needed at startup. Part of PR11953.

llvm-svn: 150161

3 files changed, 6 insertions, 7 deletions

diff --git a/llvm/lib/Target/X86/Disassembler/X86Disassembler.h b/llvm/lib/Target/X86/Disassembler/X86Disassembler.h
index 588a81a0fc3..545fbc1efa0 100644
--- a/llvm/lib/Target/X86/Disassembler/X86Disassembler.h
+++ b/llvm/lib/Target/X86/Disassembler/X86Disassembler.h
@@ -78,7 +78,7 @@
   const char*             name;
 
 #define INSTRUCTION_IDS               \
-  const InstrUID *instructionIDs;
+  unsigned instructionIDs;
 
 #include "X86DisassemblerDecoderCommon.h"
 
diff --git a/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c b/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
index 958f653eb73..9a628f2163d 100644
--- a/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
+++ b/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
@@ -131,14 +131,13 @@ static InstrUID decode(OpcodeType type,
     debug("Corrupt table!  Unknown modrm_type");
     return 0;
   case MODRM_ONEENTRY:
-    return dec->instructionIDs[0];
+    return modRMTable[dec->instructionIDs];
   case MODRM_SPLITRM:
     if (modFromModRM(modRM) == 0x3)
-      return dec->instructionIDs[1];
-    else
-      return dec->instructionIDs[0];
+      return modRMTable[dec->instructionIDs+1];
+    return modRMTable[dec->instructionIDs];
   case MODRM_FULL:
-    return dec->instructionIDs[modRM];
+    return modRMTable[dec->instructionIDs+modRM];
   }
 }
 
diff --git a/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h b/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h
index a9c90f8f9bd..e10ad29e6ef 100644
--- a/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h
+++ b/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h
@@ -24,7 +24,7 @@ extern "C" {
   const char*             name;
 
 #define INSTRUCTION_IDS     \
-  const InstrUID *instructionIDs;
+  unsigned instructionIDs;
 
 #include "X86DisassemblerDecoderCommon.h"