minor BMI version check
parent
086985316f
commit
5397a66b19
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@ -266,7 +266,7 @@ MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, si
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bitD->ptr = (const char*)srcBuffer + srcSize - sizeof(bitD->bitContainer);
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bitD->bitContainer = MEM_readLEST(bitD->ptr);
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{ BYTE const lastByte = ((const BYTE*)srcBuffer)[srcSize-1];
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bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0;
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bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0; /* ensures bitsConsumed is always set */
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if (lastByte == 0) return ERROR(GENERIC); /* endMark not present */ }
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} else {
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bitD->start = (const char*)srcBuffer;
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@ -298,7 +298,7 @@ MEM_STATIC size_t BIT_getUpperBits(size_t bitContainer, U32 const start)
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MEM_STATIC size_t BIT_getMiddleBits(size_t bitContainer, U32 const start, U32 const nbBits)
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{
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#if defined(__BMI__) && defined(__GNUC__) /* experimental */
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#if defined(__BMI__) && defined(__GNUC__) && __GNUC__*1000+__GNUC_MINOR__ >= 4008 /* experimental */
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# if defined(__x86_64__)
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if (sizeof(bitContainer)==8)
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return _bextr_u64(bitContainer, start, nbBits);
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@ -367,10 +367,10 @@ MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, U32 nbBits)
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}
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/*! BIT_reloadDStream() :
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* Refill `BIT_DStream_t` from src buffer previously defined (see BIT_initDStream() ).
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* Refill `bitD` from buffer previously set in BIT_initDStream() .
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* This function is safe, it guarantees it will not read beyond src buffer.
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* @return : status of `BIT_DStream_t` internal register.
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if status == unfinished, internal register is filled with >= (sizeof(bitD->bitContainer)*8 - 7) bits */
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if status == BIT_DStream_unfinished, internal register is filled with >= (sizeof(bitD->bitContainer)*8 - 7) bits */
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MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD)
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{
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if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* should not happen => corruption detected */
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