Fixed handling of immediate operand sizes, which

weren't properly reflecting the OperandSize attribute
of the instruction leading to improper decoding of
certain instructions with the 66H prefix.  Also added
a test case for this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117084 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/Disassembler/X86DisassemblerDecoder.c

@@ -405,7 +405,7 @@ static int readPrefixes(struct InternalInstruction* insn) {
     insn->registerSize       = (hasOpSize ? 2 : 4);
     insn->addressSize        = (hasAdSize ? 2 : 4);
     insn->displacementSize   = (hasAdSize ? 2 : 4);
-    insn->immediateSize      = (hasAdSize ? 2 : 4);
+    insn->immediateSize      = (hasOpSize ? 2 : 4);
   } else if (insn->mode == MODE_64BIT) {
     if (insn->rexPrefix && wFromREX(insn->rexPrefix)) {
       insn->registerSize       = 8;

test/MC/Disassembler/simple-tests.txt

@@ -63,3 +63,6 @@
 
 # CHECK: enter	$1, $2
 0xc8 0x01 0x00 0x02
+
+# CHECK: movw	$47416, -66(%rbp)
+0x66 0xc7 0x45 0xbe 0x38 0xb9