Support APX zero-upper

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

diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index cb3d464e97ae43baa87b7dfcd7335eaa6ee0e889..a84e99977dc11ab06d3b76110a6c9822b4ae72c0 100644 (file)
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -4285,8 +4285,9 @@ build_apx_evex_prefix (void)
     i.vex.bytes[3] &= ~0x08;
 
   /* Encode the NDD bit of the instruction promoted from the legacy
-     space.  */
-  if (i.vex.register_specifier && i.tm.opcode_space == SPACE_EVEXMAP4)
+     space. ZU shares the same bit with NDD.  */
+  if ((i.vex.register_specifier && i.tm.opcode_space == SPACE_EVEXMAP4)
+      || i.tm.opcode_modifier.zu)
     i.vex.bytes[3] |= 0x10;
 
   /* Encode the NF bit.  */