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intel: Fallback to atomic-ops.h [libatomic-ops-dev] 

Use the external implementation for atomic operations across a wide
range of architectures.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
main
Chris Wilson 2009-10-13 15:13:00 +01:00
parent 24c905f841
commit 901bacd29c
2 changed files with 26 additions and 1 deletions
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10
configure.ac
View File

@ -163,15 +163,23 @@ if test "x$INTEL" != "xno"; then
], [],
drm_cv_atomic_primitives="Intel"
)
if test "x$drm_cv_atomic_primitives" = "xnone"; then
AC_CHECK_HEADER([atomic_ops.h], drm_cv_atomic_primitives="libatomic-ops")
fi
])
if test "x$drm_cv_atomic_primitives" = xIntel; then
AC_DEFINE(HAVE_INTEL_ATOMIC_PRIMITIVES, 1,
[Enable if your compiler supports the Intel __sync_* atomic primitives])
fi
if test "x$drm_cv_atomic_primitives" = "xlibatomic-ops"; then
AC_DEFINE(HAVE_LIB_ATOMIC_OPS, 1, [Enable if you have libatomic-ops-dev installed])
fi
if test "x$drm_cv_atomic_primitives" = "xnone"; then
if test "x$INTEL" != "xauto"; then
AC_MSG_ERROR([libdrm_intel depends upon atomic operations, which were not found for your compiler/cpu. Try compiling with -march=native, or disable support for Intel GPUs by passing --disable-intel to ./configure])
AC_MSG_ERROR([libdrm_intel depends upon atomic operations, which were not found for your compiler/cpu. Try compiling with -march=native, or install the libatomics-op-dev package, or, failing both of those, disable support for Intel GPUs by passing --disable-intel to ./configure])
else
INTEL=no
fi

17
libdrm/intel/intel_atomic.h
View File

@ -54,6 +54,23 @@ typedef struct {
#endif
#if HAVE_LIB_ATOMIC_OPS
#include <atomic_ops.h>
#define HAS_ATOMIC_OPS 1
typedef struct {
AO_t atomic;
} atomic_t;
# define atomic_read(x) AO_load_full(&(x)->atomic)
# define atomic_set(x, val) AO_store_full(&(x)->atomic, (val))
# define atomic_inc(x) ((void) AO_fetch_and_add1_full(&(x)->atomic))
# define atomic_dec_and_test(x) (AO_fetch_and_sub1_full(&(x)->atomic) == 1)
# define atomic_cmpxchg(x, oldv, newv) AO_compare_and_swap_full(&(x)->atomic, oldv, newv)
#endif
#if ! HAS_ATOMIC_OPS
#error libdrm-intel requires atomic operations, please define them for your CPU/compiler.
#endif