From cb49132166faf4c8668b09a300bd9e3877327a33 Mon Sep 17 00:00:00 2001
From: Christoph Bumiller <christoph.bumiller@speed.at>
Date: Mon, 17 Nov 2014 20:05:53 +0100
Subject: [PATCH] gallium/auxiliary: add inc and dec alternative with return
 (v4)

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

Acked-by: Jose Fonseca <jfonseca@vmware.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: David Heidelberg <david@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 2f2b42b346f..9731aa04bbc 100644
--- a/src/gallium/auxiliary/util/u_atomic.h
+++ b/src/gallium/auxiliary/util/u_atomic.h
@@ -68,6 +68,18 @@ p_atomic_dec(int32_t *v)
    __asm__ __volatile__("lock; decl %0":"+m"(*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)
 {
@@ -115,6 +127,18 @@ p_atomic_dec(int32_t *v)
    __asm__ __volatile__("lock; decl %0":"+m"(*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)
 {
@@ -160,6 +184,18 @@ p_atomic_dec(int32_t *v)
    (void) __sync_sub_and_fetch(v, 1);
 }
 
+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)
 {
@@ -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
@@ -288,12 +326,24 @@ 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)
 {
    _InterlockedDecrement((long *)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)
 {
@@ -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)
-- 
2.30.2