util: Prefer atomic intrinsics to inline assembly.

Cuts a little more than 1k of .text size from i915g.

This was previously done in commit 5f66b340 and subsequently reverted in
commit 3661f757 after bug 30514 was filed. I believe the cause of bug
30514 wasn't anything related to cross compiling, but rather that the
toolchain used defaulted to -march=i386, and i386 doesn't have the
CMPXCHG or XADD instructions used to implement the intrinsics.

So we reverted a patch that improved things so that we didn't break
compilation for a platform that never could have worked anyway.

diff --git a/src/gallium/auxiliary/util/u_atomic.h b/src/gallium/auxiliary/util/u_atomic.h
index 9731aa04bbc48ebcb4ea7dea18f0598e34bb600d..2500bc75249f1f7daec25f199fd0f6e3eb1f55d9 100644 (file)
--- a/src/gallium/auxiliary/util/u_atomic.h
+++ b/src/gallium/auxiliary/util/u_atomic.h
@@ -24,12 +24,12 @@
 #define PIPE_ATOMIC_MSVC_INTRINSIC
 #elif (defined(PIPE_CC_MSVC) && defined(PIPE_ARCH_X86))
 #define PIPE_ATOMIC_ASM_MSVC_X86                
+#elif defined(PIPE_CC_GCC) && (PIPE_CC_GCC_VERSION >= 401)
+#define PIPE_ATOMIC_GCC_INTRINSIC
 #elif (defined(PIPE_CC_GCC) && defined(PIPE_ARCH_X86))
 #define PIPE_ATOMIC_ASM_GCC_X86
 #elif (defined(PIPE_CC_GCC) && defined(PIPE_ARCH_X86_64))
 #define PIPE_ATOMIC_ASM_GCC_X86_64
-#elif defined(PIPE_CC_GCC) && (PIPE_CC_GCC_VERSION >= 401)
-#define PIPE_ATOMIC_GCC_INTRINSIC
 #else
 #error "Unsupported platform"
 #endif