mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-23 18:09:48 +00:00
119 lines
3.1 KiB
C++
119 lines
3.1 KiB
C++
// crc-simd.cpp - written and placed in the public domain by
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// Jeffrey Walton, Uri Blumenthal and Marcel Raad.
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//
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// This source file uses intrinsics to gain access to ARMv7a and
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// ARMv8a NEON instructions. A separate source file is needed
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// because additional CXXFLAGS are required to enable the
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// appropriate instructions sets in some build configurations.
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#include "pch.h"
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#include "config.h"
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#include "stdcpp.h"
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#if (CRYPTOPP_ARM_NEON_AVAILABLE)
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# include <arm_neon.h>
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#endif
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// Can't use CRYPTOPP_ARM_XXX_AVAILABLE because too many
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// compilers don't follow ACLE conventions for the include.
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#if defined(CRYPTOPP_ARM_ACLE_AVAILABLE)
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# include <stdint.h>
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# include <arm_acle.h>
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#endif
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#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
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# include <signal.h>
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# include <setjmp.h>
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#endif
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#ifndef EXCEPTION_EXECUTE_HANDLER
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# define EXCEPTION_EXECUTE_HANDLER 1
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#endif
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NAMESPACE_BEGIN(CryptoPP)
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#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
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extern "C" {
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typedef void (*SigHandler)(int);
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static jmp_buf s_jmpSIGILL;
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static void SigIllHandler(int)
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{
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longjmp(s_jmpSIGILL, 1);
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}
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};
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#endif // Not CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
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bool CPU_ProbeNEON()
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{
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#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
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return false;
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#elif (CRYPTOPP_ARM_NEON_AVAILABLE)
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# if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
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volatile bool result = true;
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__try
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{
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uint32_t v1[4] = {1,1,1,1};
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uint32x4_t x1 = vld1q_u32(v1);
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uint64_t v2[2] = {1,1};
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uint64x2_t x2 = vld1q_u64(v2);
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uint32x4_t x3 = vdupq_n_u32(2);
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x3 = vsetq_lane_u32(vgetq_lane_u32(x1,0),x3,0);
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x3 = vsetq_lane_u32(vgetq_lane_u32(x1,3),x3,3);
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uint64x2_t x4 = vdupq_n_u64(2);
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x4 = vsetq_lane_u64(vgetq_lane_u64(x2,0),x4,0);
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x4 = vsetq_lane_u64(vgetq_lane_u64(x2,1),x4,1);
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result = !!(vgetq_lane_u32(x3,0) | vgetq_lane_u64(x4,1));
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}
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__except (EXCEPTION_EXECUTE_HANDLER)
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{
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return false;
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}
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return result;
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# else
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// longjmp and clobber warnings. Volatile is required.
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// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
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volatile bool result = true;
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volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);
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if (oldHandler == SIG_ERR)
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return false;
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volatile sigset_t oldMask;
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if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))
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return false;
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if (setjmp(s_jmpSIGILL))
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result = false;
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else
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{
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uint32_t v1[4] = {1,1,1,1};
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uint32x4_t x1 = vld1q_u32(v1);
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uint64_t v2[2] = {1,1};
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uint64x2_t x2 = vld1q_u64(v2);
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uint32x4_t x3 = {0,0,0,0};
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x3 = vsetq_lane_u32(vgetq_lane_u32(x1,0),x3,0);
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x3 = vsetq_lane_u32(vgetq_lane_u32(x1,3),x3,3);
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uint64x2_t x4 = {0,0};
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x4 = vsetq_lane_u64(vgetq_lane_u64(x2,0),x4,0);
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x4 = vsetq_lane_u64(vgetq_lane_u64(x2,1),x4,1);
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// Hack... GCC optimizes away the code and returns true
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result = !!(vgetq_lane_u32(x3,0) | vgetq_lane_u64(x4,1));
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}
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sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
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signal(SIGILL, oldHandler);
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return result;
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# endif
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#else
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return false;
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#endif // CRYPTOPP_ARM_NEON_AVAILABLE
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}
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NAMESPACE_END
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