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Merge pull request #282 from SChernykh/fix-ub

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Fixed UB in ARM64 JIT compiler
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SChernykh 2023-10-20 10:42:40 +02:00 • committed by GitHub
commit 5fc512e71c
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2 changed files with 3 additions and 2 deletions
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3
src/jit_compiler_a64.cpp
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@ -709,7 +709,8 @@ void JitCompilerA64::h_IMUL_RCP(Instruction& instr, uint32_t& codePos)
const uint32_t literal_id = (ImulRcpLiteralsEnd - literalPos) / sizeof(uint64_t);
literalPos -= sizeof(uint64_t);
*(uint64_t*)(code + literalPos) = (q << shift) + ((r << shift) / divisor);
const uint64_t randomx_reciprocal = (q << shift) + ((r << shift) / divisor);
memcpy(code + literalPos, &randomx_reciprocal, sizeof(randomx_reciprocal));
if (literal_id < 12)
{

2
src/jit_compiler_a64.hpp
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@ -81,7 +81,7 @@ namespace randomx {
static void emit64(uint64_t val, uint8_t* code, uint32_t& codePos)
{
*(uint64_t*)(code + codePos) = val;
memcpy(code + codePos, &val, sizeof(val));
codePos += sizeof(val);
}