[Mesa-dev] [PATCH] gallium/auxiliary: add inc and dec alternative with return (v4)

[Axel Davy]

From: Christoph Bumiller <christoph.bumiller at speed.at>

At this moment we use only zero or positive values.

v2: Implement it for also for Solaris, MSVC assembly
    and enable for other combinations.

v3: Replace MSVC assembly by assert + warning during compilation

v4: remove inc and dec with return for MSVC assembly

Signed-off-by: David Heidelberg <david at ixit.cz>
---
 src/gallium/auxiliary/util/u_atomic.h | 52 +++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/src/gallium/auxiliary/util/u_atomic.h b/src/gallium/auxiliary/util/u_atomic.h
index 2f2b42b..9731aa0 100644
--- a/src/gallium/auxiliary/util/u_atomic.h
+++ b/src/gallium/auxiliary/util/u_atomic.h
@@ -69,6 +69,18 @@ p_atomic_dec(int32_t *v)
 }
 
 static INLINE int32_t
+p_atomic_inc_return(int32_t *v)
+{
+   return __sync_add_and_fetch(v, 1);
+}
+
+static INLINE int32_t
+p_atomic_dec_return(int32_t *v)
+{
+   return __sync_sub_and_fetch(v, 1);
+}
+
+static INLINE int32_t
 p_atomic_cmpxchg(int32_t *v, int32_t old, int32_t _new)
 {
    return __sync_val_compare_and_swap(v, old, _new);
@@ -116,6 +128,18 @@ p_atomic_dec(int32_t *v)
 }
 
 static INLINE int32_t
+p_atomic_inc_return(int32_t *v)
+{
+   return __sync_add_and_fetch(v, 1);
+}
+
+static INLINE int32_t
+p_atomic_dec_return(int32_t *v)
+{
+   return __sync_sub_and_fetch(v, 1);
+}
+
+static INLINE int32_t
 p_atomic_cmpxchg(int32_t *v, int32_t old, int32_t _new)
 {
    return __sync_val_compare_and_swap(v, old, _new);
@@ -161,6 +185,18 @@ p_atomic_dec(int32_t *v)
 }
 
 static INLINE int32_t
+p_atomic_inc_return(int32_t *v)
+{
+   return __sync_add_and_fetch(v, 1);
+}
+
+static INLINE int32_t
+p_atomic_dec_return(int32_t *v)
+{
+   return __sync_sub_and_fetch(v, 1);
+}
+
+static INLINE int32_t
 p_atomic_cmpxchg(int32_t *v, int32_t old, int32_t _new)
 {
    return __sync_val_compare_and_swap(v, old, _new);
@@ -186,6 +222,8 @@ p_atomic_cmpxchg(int32_t *v, int32_t old, int32_t _new)
 #define p_atomic_dec_zero(_v) ((boolean) --(*(_v)))
 #define p_atomic_inc(_v) ((void) (*(_v))++)
 #define p_atomic_dec(_v) ((void) (*(_v))--)
+#define p_atomic_inc_return(_v) ((*(_v))++)
+#define p_atomic_dec_return(_v) ((*(_v))--)
 #define p_atomic_cmpxchg(_v, old, _new) (*(_v) == old ? *(_v) = (_new) : *(_v))
 
 #endif
@@ -288,6 +326,12 @@ p_atomic_inc(int32_t *v)
    _InterlockedIncrement((long *)v);
 }
 
+static INLINE int32_t
+p_atomic_inc_return(int32_t *v)
+{
+   return _InterlockedIncrement((long *)v);
+}
+
 static INLINE void
 p_atomic_dec(int32_t *v)
 {
@@ -295,6 +339,12 @@ p_atomic_dec(int32_t *v)
 }
 
 static INLINE int32_t
+p_atomic_dec_return(int32_t *v)
+{
+   return _InterlockedDecrement((long *)v);
+}
+
+static INLINE int32_t
 p_atomic_cmpxchg(int32_t *v, int32_t old, int32_t _new)
 {
    return _InterlockedCompareExchange((long *)v, _new, old);
@@ -329,6 +379,8 @@ p_atomic_dec_zero(int32_t *v)
 
 #define p_atomic_inc(_v) atomic_inc_32((uint32_t *) _v)
 #define p_atomic_dec(_v) atomic_dec_32((uint32_t *) _v)
+#define p_atomic_inc_return(_v) atomic_inc_32_nv((uint32_t *) _v)
+#define p_atomic_dec_return(_v) atomic_dec_32_nv((uint32_t *) _v)
 
 #define p_atomic_cmpxchg(_v, _old, _new) \
 	atomic_cas_32( (uint32_t *) _v, (uint32_t) _old, (uint32_t) _new)
-- 
2.1.0