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D23869.diff
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Index: head/sys/amd64/include/atomic.h
===================================================================
--- head/sys/amd64/include/atomic.h
+++ head/sys/amd64/include/atomic.h
@@ -201,9 +201,8 @@
__asm __volatile( \
" " MPLOCKED " " \
" cmpxchg %3,%1 ; " \
- " sete %0 ; " \
"# atomic_cmpset_" #TYPE " " \
- : "=q" (res), /* 0 */ \
+ : "=@cce" (res), /* 0 */ \
"+m" (*dst), /* 1 */ \
"+a" (expect) /* 2 */ \
: "r" (src) /* 3 */ \
@@ -219,9 +218,8 @@
__asm __volatile( \
" " MPLOCKED " " \
" cmpxchg %3,%1 ; " \
- " sete %0 ; " \
"# atomic_fcmpset_" #TYPE " " \
- : "=q" (res), /* 0 */ \
+ : "=@cce" (res), /* 0 */ \
"+m" (*dst), /* 1 */ \
"+a" (*expect) /* 2 */ \
: "r" (src) /* 3 */ \
@@ -278,9 +276,8 @@
__asm __volatile(
" " MPLOCKED " "
" btsl %2,%1 ; "
- " setc %0 ; "
"# atomic_testandset_int"
- : "=q" (res), /* 0 */
+ : "=@ccc" (res), /* 0 */
"+m" (*p) /* 1 */
: "Ir" (v & 0x1f) /* 2 */
: "cc");
@@ -295,9 +292,8 @@
__asm __volatile(
" " MPLOCKED " "
" btsq %2,%1 ; "
- " setc %0 ; "
"# atomic_testandset_long"
- : "=q" (res), /* 0 */
+ : "=@ccc" (res), /* 0 */
"+m" (*p) /* 1 */
: "Jr" ((u_long)(v & 0x3f)) /* 2 */
: "cc");
@@ -312,9 +308,8 @@
__asm __volatile(
" " MPLOCKED " "
" btrl %2,%1 ; "
- " setc %0 ; "
"# atomic_testandclear_int"
- : "=q" (res), /* 0 */
+ : "=@ccc" (res), /* 0 */
"+m" (*p) /* 1 */
: "Ir" (v & 0x1f) /* 2 */
: "cc");
@@ -329,9 +324,8 @@
__asm __volatile(
" " MPLOCKED " "
" btrq %2,%1 ; "
- " setc %0 ; "
"# atomic_testandclear_long"
- : "=q" (res), /* 0 */
+ : "=@ccc" (res), /* 0 */
"+m" (*p) /* 1 */
: "Jr" ((u_long)(v & 0x3f)) /* 2 */
: "cc");
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D23869: amd64 atomic.h: minor codegen optimization in flag access
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