On a Roland Scheidegger idea!
Benjamin
diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index 3e42911..da2e72f 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -86,6 +86,12 @@ _mesa_free_texmemory(void *m)
static GLuint
logbase2(GLuint n)
{
+#if defined(PIPE_CC_GCC) && (PIPE_CC_GCC_VERSION >= 340)
+ if (n <= 1)
+ return 0;
+
+ return (31 - __builtin_clz(n | 1));
+#else
GLuint pos = 0;
if (n >= 1<<16) { n >>= 16; pos += 16; }
if (n >= 1<< 8) { n >>= 8; pos += 8; }
@@ -93,6 +99,7 @@ logbase2(GLuint n)
if (n >= 1<< 2) { n >>= 2; pos += 2; }
if (n >= 1<< 1) { pos += 1; }
return pos;
+#endif
}
diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index 65a99fc..cde9c92 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -477,6 +477,12 @@ float_to_byte_tex(float f)
static INLINE unsigned
util_logbase2(unsigned n)
{
+#if defined(PIPE_CC_GCC) && (PIPE_CC_GCC_VERSION >= 340)
+ if (n <= 1)
+ return 0;
+
+ return (31 - __builtin_clz(n | 1));
+#else
unsigned pos = 0;
if (n >= 1<<16) { n >>= 16; pos += 16; }
if (n >= 1<< 8) { n >>= 8; pos += 8; }
@@ -484,6 +490,7 @@ util_logbase2(unsigned n)
if (n >= 1<< 2) { n >>= 2; pos += 2; }
if (n >= 1<< 1) { pos += 1; }
return pos;
+#endif
}
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