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RocksDB for Erlang
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deps/CRoaring/include/roaring/utilasm.h
/*
* utilasm.h
*
*/
#ifndef INCLUDE_UTILASM_H_
#define INCLUDE_UTILASM_H_
#include <roaring/portability.h>
#ifdef __cplusplus
extern "C" {
namespace roaring {
#endif
#if defined(CROARING_INLINE_ASM)
#define CROARING_ASMBITMANIPOPTIMIZATION // optimization flag
#define ASM_SHIFT_RIGHT(srcReg, bitsReg, destReg) \
__asm volatile("shrx %1, %2, %0" \
: "=r"(destReg) \
: /* write */ \
"r"(bitsReg), /* read only */ \
"r"(srcReg) /* read only */ \
)
#define ASM_INPLACESHIFT_RIGHT(srcReg, bitsReg) \
__asm volatile("shrx %1, %0, %0" \
: "+r"(srcReg) \
: /* read/write */ \
"r"(bitsReg) /* read only */ \
)
#define ASM_SHIFT_LEFT(srcReg, bitsReg, destReg) \
__asm volatile("shlx %1, %2, %0" \
: "=r"(destReg) \
: /* write */ \
"r"(bitsReg), /* read only */ \
"r"(srcReg) /* read only */ \
)
// set bit at position testBit within testByte to 1 and
// copy cmovDst to cmovSrc if that bit was previously clear
#define ASM_SET_BIT_INC_WAS_CLEAR(testByte, testBit, count) \
__asm volatile( \
"bts %2, %0\n" \
"sbb $-1, %1\n" \
: "+r"(testByte), /* read/write */ \
"+r"(count) \
: /* read/write */ \
"r"(testBit) /* read only */ \
)
#define ASM_CLEAR_BIT_DEC_WAS_SET(testByte, testBit, count) \
__asm volatile( \
"btr %2, %0\n" \
"sbb $0, %1\n" \
: "+r"(testByte), /* read/write */ \
"+r"(count) \
: /* read/write */ \
"r"(testBit) /* read only */ \
)
#define ASM_BT64(testByte, testBit, count) \
__asm volatile( \
"bt %2,%1\n" \
"sbb %0,%0" /*could use setb */ \
: "=r"(count) \
: /* write */ \
"r"(testByte), /* read only */ \
"r"(testBit) /* read only */ \
)
#endif
#ifdef __cplusplus
}
} // extern "C" { namespace roaring {
#endif
#endif /* INCLUDE_UTILASM_H_ */