x86/APX: correct disassembly for EVEX.B4
EVEX.B4 is used only for GPR (or addressing of memory) operands. SIMD
registers encoded via ModR/M.rm (when ModR/M.mod == 3) have their top
bit in EVEX.X3. Supposedly (doc version 004) EVEX.B4 is ignored when
unused, hence also don't flag such encodings as invalid.
diff --git a/opcodes/i386-dis.c b/opcodes/i386-dis.c
index 26d667a..e2c7b1b 100644
--- a/opcodes/i386-dis.c
+++ b/opcodes/i386-dis.c
@@ -13012,14 +13012,15 @@
USED_REX (REX_B);
if (ins->rex & REX_B)
reg += 8;
- if (ins->rex2 & REX_B)
- reg += 16;
if (ins->vex.evex)
{
USED_REX (REX_X);
if ((ins->rex & REX_X))
reg += 16;
+ ins->rex2_used &= ~REX_B;
}
+ else if (ins->rex2 & REX_B)
+ reg += 16;
if ((sizeflag & SUFFIX_ALWAYS)
&& (bytemode == x_swap_mode
