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Windows: NEON detection and intrinsic includes on Visual Studio

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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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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;