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x86_64 pr5ocessors ( 64Bit AMD at least ) offer the instruction bextr ( AMD64 Architecture Programmer's Manual, Vol. 1: Extgract Bitfield ...The BEXTR instruction ( ... ) extracts a contiguous field of bits from the first source operand, as specified by the control field setting in the second source operand and pots the extracted field into the least significant bit positions of the
destination. The remaining bits in the destination regitser are cleared to 0 )but "as"/"gas" seems not to know bextr ( SuSE Linux 11.4 desktop ), but maybe it's
just that my operand coding e.g. bextr -8(%rbp),%r8,$4,%eax is wrong.Intended above ist take starting bit No from r8, fieldwidth 4, destination eax.
Unfortunately the AMD- manual let's me only guess how doe denote it. -- To unsubscribe from this list: send the line "unsubscribe linux-assembly" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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