Hi,
First part of the patch adds memory fence for aarch64. Strictly, this isn't
necessary, as the fallback to __atomic_thread_fence (__ATOMIC_SEQ_CST)
would output the same dmb ish instruction.
Second part makes sure the ancient arm float format doesn't get used.
Originally I added an if defined(__aarch64__) like the rest, but then I
thought perhaps reversing the the if else makes sense. old arm float format
is so rare, that the default should be native float ordering. By selecting
__arm__ and !( list of features known to identify native endian on arm ),
we don't need to list all the architectures in world that not mixed-endian.
The feature list was picked up from webkit and firefox.
Alternative would be to drop all ancient arm float support - anyone still
using the abi wouldn't be upgrading to new libev.
--- a/ev.c
+++ b/ev.c
@@ -616,6 +616,8 @@
#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
#elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
+ #elif __aarch64__
+ #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
#elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
|| defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
@@ -1043,22 +1045,14 @@
/* basically, everything uses "ieee pure-endian" floating point numbers */
/* the only noteworthy exception is ancient armle, which uses order 43218765 */
-#if 0 \
- || __i386 || __i386__ \
- || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
- || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
- || defined __arm__ && defined __ARM_EABI__ \
- || defined __s390__ || defined __s390x__ \
- || defined __mips__ \
- || defined __alpha__ \
- || defined __hppa__ \
- || defined __ia64__ \
- || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
- #define ECB_STDFP 1
- #include <string.h> /* for memcpy */
-#else
+#if defined(__arm__) && ! (defined(__ARM_EABI__) || defined(__EABI__) \
+ || defined(__VFP_FP__) || defined(_WIN32_WCE) || defined(ANDROID))
#define ECB_STDFP 0
#include <math.h> /* for frexp*, ldexp* */
+ #warning "building for ancient arm"
+#else
+ #define ECB_STDFP 1
+ #include <string.h> /* for memcpy */
#endif
#ifndef ECB_NO_LIBM
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