svn commit: r358440 - head/sys/amd64/amd64

[Ryan Libby]

Author: rlibby
Date: Fri Feb 28 18:32:40 2020
New Revision: 358440
URL: https://svnweb.freebsd.org/changeset/base/358440

Log:
  amd64 pmap.c: minor codegen optimization in flag access
  
  Following previous revision, apply the same minor optimization to
  hand-rolled atomic_fcmpset_128 in pmap.c.
  
  Reviewed by:	kib, markj
  Sponsored by:	Dell EMC Isilon
  Differential Revision:	https://reviews.freebsd.org/D23870

Modified:
  head/sys/amd64/amd64/pmap.c

Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c	Fri Feb 28 18:32:36 2020	(r358439)
+++ head/sys/amd64/amd64/pmap.c	Fri Feb 28 18:32:40 2020	(r358440)
@@ -714,8 +714,8 @@ pmap_di_load_invl(struct pmap_invl_gen *ptr, struct pm
 	old_low = new_low = 0;
 	old_high = new_high = (uintptr_t)0;
 
-	__asm volatile("lock;cmpxchg16b\t%1;sete\t%0"
-	    : "=r" (res), "+m" (*ptr), "+a" (old_low), "+d" (old_high)
+	__asm volatile("lock;cmpxchg16b\t%1"
+	    : "=@cce" (res), "+m" (*ptr), "+a" (old_low), "+d" (old_high)
 	    : "b"(new_low), "c" (new_high)
 	    : "memory", "cc");
 	if (res == 0) {
@@ -742,8 +742,8 @@ pmap_di_store_invl(struct pmap_invl_gen *ptr, struct p
 	old_low = old_val->gen;
 	old_high = (uintptr_t)old_val->next;
 
-	__asm volatile("lock;cmpxchg16b\t%1;sete\t%0"
-	    : "=r" (res), "+m" (*ptr), "+a" (old_low), "+d" (old_high)
+	__asm volatile("lock;cmpxchg16b\t%1"
+	    : "=@cce" (res), "+m" (*ptr), "+a" (old_low), "+d" (old_high)
 	    : "b"(new_low), "c" (new_high)
 	    : "memory", "cc");
 	return (res);