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Better documentation in the code.

This commit is contained in:
Daniel Lemire 2020-06-26 13:02:12 -04:00
parent b6997a56df
commit 88da62ba09
1 changed files with 21 additions and 9 deletions
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30
include/simdjson/portability.h
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@ -41,20 +41,23 @@
#define SIMDJSON_IS_ARM64 1
#else
#define SIMDJSON_IS_32BITS 1
// We do not support 32-bit platforms, but it can be
// handy to identify them.
#if defined(_M_IX86) || defined(__i386__)
#define SIMDJSON_IS_X86_32BITS 1
#elif defined(__arm__) || defined(_M_ARM)
#define SIMDJSON_IS_ARM_32BITS 1
#endif
#endif // defined(__x86_64__) || defined(_M_AMD64)
#ifdef SIMDJSON_IS_32BITS
#if defined(SIMDJSON_REGULAR_VISUAL_STUDIO) || defined(__GNUC__)
#pragma message("The simdjson library is designed\
for 64-bit processors and it seems that you are not \
#pragma message("The simdjson library is designed \
for 64-bit processors and it seems that you are not \
compiling for a known 64-bit platform. All fast kernels \
will be disabled and performance may be poor. Please \
use a 64-bit target such as x64 or 64-bit ARM.")
#else
#error "The simdjson library is designed\
for 64-bit processors. It seems that you are not \
compiling for a known 64-bit platform."
#endif
#endif // SIMDJSON_IS_32BITS
// this is almost standard?
@ -75,6 +78,15 @@ compiling for a known 64-bit platform."
#define SIMDJSON_IMPLEMENTATION_WESTMERE 0
#endif // SIMDJSON_IS_ARM64
// Our fast kernels require 64-bit systems.
//
// On 32-bit x86, we lack 64-bit popcnt, lzcnt, blsr instructions.
// Furthermore, the number of SIMD registers is reduced.
//
// On 32-bit ARM, we would have smaller registers.
//
// The simdjson users should still have the fallback kernel. It is
// slower, but it should run everywhere.
#if SIMDJSON_IS_X86_64
#ifndef SIMDJSON_IMPLEMENTATION_HASWELL
#define SIMDJSON_IMPLEMENTATION_HASWELL 1
@ -85,7 +97,7 @@ compiling for a known 64-bit platform."
#define SIMDJSON_IMPLEMENTATION_ARM64 0
#endif // SIMDJSON_IS_X86_64
// we are going to use runtime dispatch
// We are going to use runtime dispatch.
#ifdef SIMDJSON_IS_X86_64
#ifdef __clang__
// clang does not have GCC push pop