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Windows: NEON detection and intrinsic includes on Visual Studio 

Visual Studio doesn't define __ARM_ARCH nor _ARM_NEON, but _M_ARM and _M_ARM64,
so SDL_HasNEON() was bypassed.

PF_ARM_NEON_INSTRUCTIONS_AVAILABLE doesn't see to be defined (but still works
 when defined as 19).
This commit is contained in:
Sylvain Becker 2018-12-04 16:50:31 +01:00
parent aea7e56a24
commit 09b462044f
2 changed files with 28 additions and 7 deletions
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18
include/SDL_cpuinfo.h
View File

@ -54,8 +54,22 @@
#if defined(HAVE_ALTIVEC_H) && defined(__ALTIVEC__) && !defined(__APPLE_ALTIVEC__) && defined(SDL_ENABLE_ALTIVEC_H)
#include <altivec.h>
#endif
#if defined(__ARM_NEON) && !defined(SDL_DISABLE_ARM_NEON_H)
#include <arm_neon.h>
#if !defined(SDL_DISABLE_ARM_NEON_H)
# if defined(__ARM_NEON)
# include <arm_neon.h>
# elif defined(__WINDOWS__) || defined(__WINRT__)
/* Visual Studio doesn't define __ARM_ARCH, but _M_ARM (if set, always 7), and _M_ARM64 (if set, always 1).
# if defined(_M_ARM)
# include <armintr.h>
# include <arm_neon.h>
# endif
# if defined (_M_ARM64)
# include <armintr.h>
# include <arm_neon.h>
# endif
/* Set __ARM_NEON so that it can be used elsewhere, at compile time */
# define __ARM_NEON 1
# endif
#endif
#if defined(__3dNOW__) && !defined(SDL_DISABLE_MM3DNOW_H)
#include <mm3dnow.h>

17
src/cpuinfo/SDL_cpuinfo.c
View File

@ -352,8 +352,18 @@ CPU_haveNEON(void)
{
/* The way you detect NEON is a privileged instruction on ARM, so you have
query the OS kernel in a platform-specific way. :/ */
#if defined(SDL_CPUINFO_DISABLED) || !defined(__ARM_ARCH)
return 0; /* disabled or not an ARM CPU at all. */
#if defined(SDL_CPUINFO_DISABLED)
return 0; /* disabled */
#elif (defined(__WINDOWS__) || defined(__WINRT__)) && (defined(_M_ARM) || defined(_M_ARM64))
/* Visual Studio, for ARM, doesn't define __ARM_ARCH. Handle this first. */
/* Seems to have been removed */
# if !defined(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE)
# define PF_ARM_NEON_INSTRUCTIONS_AVAILABLE 19
# endif
/* All WinRT ARM devices are required to support NEON, but just in case. */
return IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE) != 0;
#elif !defined(__ARM_ARCH)
return 0; /* not an ARM CPU at all. */
#elif __ARM_ARCH >= 8
return 1; /* ARMv8 always has non-optional NEON support. */
#elif defined(__APPLE__) && (__ARM_ARCH >= 7)
@ -379,9 +389,6 @@ CPU_haveNEON(void)
}
return 0;
}
#elif (defined(__WINDOWS__) || defined(__WINRT__)) && defined(_M_ARM)
/* All WinRT ARM devices are required to support NEON, but just in case. */
return IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE) != 0;
#else
#warning SDL_HasNEON is not implemented for this ARM platform. Write me.
return 0;