[nasm:nasm-2.15.xx] BR 3392676: fix cmpxchg8b/16b with explicit size

[nasm-bot for H. Peter Anvin (Intel)]

Commit-ID:  152cbd37e208b683f424de5d56e35d840b4be31e
Gitweb:     http://repo.or.cz/w/nasm.git?a=commitdiff;h=152cbd37e208b683f424de5d56e35d840b4be31e
Author:     H. Peter Anvin (Intel) <hpa at zytor.com>
AuthorDate: Thu, 4 Jun 2020 20:22:34 -0700
Committer:  H. Peter Anvin (Intel) <hpa at zytor.com>
CommitDate: Thu, 4 Jun 2020 20:22:34 -0700

BR 3392676: fix cmpxchg8b/16b with explicit size

CMPXCHG8b/16b should be legitimate with an explicit operand size.

Reported-by: Xusheng Li <xushengli at protonmail.com>
Signed-off-by: H. Peter Anvin (Intel) <hpa at zytor.com>


---
 x86/insns.dat | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/x86/insns.dat b/x86/insns.dat
index e8117241..cec96788 100644
--- a/x86/insns.dat
+++ b/x86/insns.dat
@@ -344,8 +344,8 @@ CMPXCHG486	mem,reg16			[mr:	o16 0f a7 /r]				486,SM,UNDOC,ND,LOCK,OBSOLETE
 CMPXCHG486	reg16,reg16			[mr:	o16 0f a7 /r]				486,UNDOC,ND,OBSOLETE
 CMPXCHG486	mem,reg32			[mr:	o32 0f a7 /r]				486,SM,UNDOC,ND,LOCK,OBSOLETE
 CMPXCHG486	reg32,reg32			[mr:	o32 0f a7 /r]				486,UNDOC,ND,OBSOLETE
-CMPXCHG8B	mem				[m:	hle norexw 0f c7 /1]			PENT,LOCK
-CMPXCHG16B	mem				[m:	o64 0f c7 /1]				X64,LOCK
+CMPXCHG8B	mem64				[m:	hle norexw 0f c7 /1]			PENT,LOCK
+CMPXCHG16B	mem128				[m:	o64 0f c7 /1]				X64,LOCK
 CPUID		void				[	0f a2]					PENT
 CPU_READ	void				[	0f 3d]					PENT,CYRIX
 CPU_WRITE	void				[	0f 3c]					PENT,CYRIX