x86: consistently convert to byte registers for TEST w/ imm optimization

[deliverable/binutils-gdb.git] / gas / config / tc-i386.c

diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index d0b8f2624a1885d83d2595474bfd78ae844f48f2..efa43650928ab70f5fd8c6f02fee8a1031277478 100644 (file)
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -4009,17 +4009,16 @@ optimize_encoding (void)
          i.types[1].bitfield.byte = 1;
          /* Ignore the suffix.  */
          i.suffix = 0;
-         if (base_regnum >= 4)
-           {
-             /* Handle SP, BP, SI, DI and R12-R15 registers.  */
-             if (i.types[1].bitfield.word)
-               j = 16;
-             else if (i.types[1].bitfield.dword)
-               j = 32;
-             else
-               j = 48;
-             i.op[1].regs -= j;
-           }
+         /* Convert to byte registers.  */
+         if (i.types[1].bitfield.word)
+           j = 16;
+         else if (i.types[1].bitfield.dword)
+           j = 32;
+         else
+           j = 48;
+         if (!(i.op[1].regs->reg_flags & RegRex) && base_regnum < 4)
+           j += 8;
+         i.op[1].regs -= j;
        }
     }
   else if (flag_code == CODE_64BIT