X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fgallium%2Finclude%2Fpipe%2Fp_compiler.h;h=3441db685ce44c3f5fbb9957db40c5b571d25d1b;hb=d40b868db5b82529cbe07598b2ebef23cc31a7fa;hp=d645fd09bf05dd187c6871f731a3cf9fc5230a19;hpb=ae69f9fbf0a1aab7186e5b644085a5fe5aea99af;p=mesa.git

diff --git a/src/gallium/include/pipe/p_compiler.h b/src/gallium/include/pipe/p_compiler.h
index d645fd09bf0..3441db685ce 100644
--- a/src/gallium/include/pipe/p_compiler.h
+++ b/src/gallium/include/pipe/p_compiler.h
@@ -35,6 +35,7 @@
 #include <string.h>
 #include <stddef.h>
 #include <stdarg.h>
+#include <limits.h>
 
 
 #if defined(_WIN32) && !defined(__WIN32__)
@@ -60,6 +61,11 @@
 #include <stdbool.h>
 
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
 #if !defined(__HAIKU__) && !defined(__USE_MISC)
 typedef unsigned int       uint;
 typedef unsigned short     ushort;
@@ -74,7 +80,13 @@ typedef unsigned char boolean;
 #define FALSE false
 #endif
 
-typedef unsigned short half;
+#ifndef va_copy
+#ifdef __va_copy
+#define va_copy(dest, src) __va_copy((dest), (src))
+#else
+#define va_copy(dest, src) (dest) = (src)
+#endif
+#endif
 
 /* Function inlining */
 #ifndef INLINE
@@ -99,11 +111,44 @@ typedef unsigned short half;
 #  endif
 #endif
 
+/* Forced function inlining */
+#ifndef ALWAYS_INLINE
+#  ifdef __GNUC__
+#    define ALWAYS_INLINE inline __attribute__((always_inline))
+#  elif defined(_MSC_VER)
+#    define ALWAYS_INLINE __forceinline
+#  else
+#    define ALWAYS_INLINE INLINE
+#  endif
+#endif
+
+/*
+ * Define the C99 restrict keyword.
+ *
+ * See also:
+ * - http://cellperformance.beyond3d.com/articles/2006/05/demystifying-the-restrict-keyword.html
+ */
+#ifndef restrict
+#  if (__STDC_VERSION__ >= 199901L)
+     /* C99 */
+#  elif defined(__SUNPRO_C) && defined(__C99FEATURES__)
+     /* C99 */
+#  elif defined(__GNUC__)
+#    define restrict __restrict__
+#  elif defined(_MSC_VER)
+#    define restrict __restrict
+#  else
+#    define restrict /* */
+#  endif
+#endif
+
 
 /* Function visibility */
 #ifndef PUBLIC
 #  if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
 #    define PUBLIC __attribute__((visibility("default")))
+#  elif defined(_MSC_VER)
+#    define PUBLIC __declspec(dllexport)
 #  else
 #    define PUBLIC
 #  endif
@@ -126,6 +171,18 @@ typedef unsigned short half;
 #  define __FUNCTION__ "<unknown>"
 # endif
 #endif
+#ifndef __func__
+#  if (__STDC_VERSION__ >= 199901L) || \
+      (defined(__SUNPRO_C) && defined(__C99FEATURES__))
+       /* __func__ is part of C99 */
+#  elif defined(_MSC_VER)
+#    if _MSC_VER >= 1300
+#      define __func__ __FUNCTION__
+#    else
+#      define __func__ "<unknown>"
+#    endif
+#  endif
+#endif
 
 
 
@@ -185,5 +242,68 @@ typedef unsigned short half;
 #endif
 
 
+#if defined(__GNUC__)
+
+#define PIPE_READ_WRITE_BARRIER() __asm__("":::"memory")
+
+#elif defined(_MSC_VER)
+
+void _ReadWriteBarrier(void);
+#pragma intrinsic(_ReadWriteBarrier)
+#define PIPE_READ_WRITE_BARRIER() _ReadWriteBarrier()
+
+#else
+
+#warning "Unsupported compiler"
+#define PIPE_READ_WRITE_BARRIER() /* */
+
+#endif
+
+
+/* You should use these macros to mark if blocks where the if condition
+ * is either likely to be true, or unlikely to be true.
+ *
+ * This will inform human readers of this fact, and will also inform
+ * the compiler, who will in turn inform the CPU.
+ *
+ * CPUs often start executing code inside the if or the else blocks
+ * without knowing whether the condition is true or not, and will have
+ * to throw the work away if they find out later they executed the
+ * wrong part of the if.
+ *
+ * If these macros are used, the CPU is more likely to correctly predict
+ * the right path, and will avoid speculatively executing the wrong branch,
+ * thus not throwing away work, resulting in better performance.
+ *
+ * In light of this, it is also a good idea to mark as "likely" a path
+ * which is not necessarily always more likely, but that will benefit much
+ * more from performance improvements since it is already much faster than
+ * the other path, or viceversa with "unlikely".
+ *
+ * Example usage:
+ * if(unlikely(do_we_need_a_software_fallback()))
+ *    do_software_fallback();
+ * else
+ *    render_with_gpu();
+ *
+ * The macros follow the Linux kernel convention, and more examples can
+ * be found there.
+ *
+ * Note that profile guided optimization can offer better results, but
+ * needs an appropriate coverage suite and does not inform human readers.
+ */
+#ifdef __GNUC__
+#define likely(x) __builtin_expect(!!(x), 1)
+#define unlikely(x) __builtin_expect(!!(x), 0)
+#else
+#define likely(x) !!(x)
+#define unlikely(x) !!(x)
+#endif
+
+
+#if defined(__cplusplus)
+}
+#endif
+
 
 #endif /* P_COMPILER_H */