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Fixed bug 5402 - ARM support little update proposal

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David Carlier

No fix but mostly an update for ARM architecture.
This commit is contained in:
Sam Lantinga
2020-12-17 21:41:23 -08:00
parent 10625f9d89
commit 6bd4c717a1
7 changed files with 15 additions and 2 deletions
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2
src/atomic/SDL_spinlock.c
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@@ -138,6 +138,8 @@ SDL_AtomicTryLock(SDL_SpinLock *lock)
/* "REP NOP" is PAUSE, coded for tools that don't know it by that name. */
#if (defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__))
#define PAUSE_INSTRUCTION() __asm__ __volatile__("pause\n") /* Some assemblers can't do REP NOP, so go with PAUSE. */
#elif (defined(__arm__) && __ARM_ARCH__ >= 7) || defined(__aarch64__)
#define PAUSE_INSTRUCTION() __asm__ __volatile__("yield" ::: "memory")
#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
#define PAUSE_INSTRUCTION() _mm_pause() /* this is actually "rep nop" and not a SIMD instruction. No inline asm in MSVC x86-64! */
#elif defined(__WATCOMC__) && defined(__386__)

8
src/cpuinfo/SDL_cpuinfo.c
View File

@@ -54,6 +54,9 @@
#include <sys/param.h>
#include <sys/sysctl.h> /* For AltiVec check */
#include <machine/cpu.h>
#if defined(HAVE_ELF_AUX_INFO)
#include <sys/auxv.h>
#endif
#elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP
#include <signal.h>
#include <setjmp.h>
@@ -462,6 +465,11 @@ CPU_haveNEON(void)
return 0; /* assume anything else from Apple doesn't have NEON. */
#elif defined(__OpenBSD__)
return 1; /* OpenBSD only supports ARMv7 CPUs that have NEON. */
#elif defined(HAVE_ELF_AUX_INFO)
unsigned long hasneon = 0;
if (elf_aux_info(AT_HWCAP, (void *)&hasneon, (int)sizeof(hasneon)) != 0)
return 0;
return ((hasneon & HWCAP_NEON) == HWCAP_NEON);
#elif !defined(__arm__)
return 0; /* not an ARM CPU at all. */
#elif defined(__QNXNTO__)