AMD x86-64 Architecture Programmer's Manual, Volume 4, 128-Bit ...

AMD64 Technology 26568—Rev. 3.05—September 2003
PSRAD Packed Shift Right Arithmetic Doublewords
Right-shifts each of the packed 32-bit values in the first source operand by the number
of bits specified in the second source operand and writes each shifted value in the
corresponding doubleword of the destination (first source). The first
source/destination and second source operands are:
� an XMM register and another XMM register or 128-bit memory location, or
� an XMM register and an immediate byte value.
The high-order bits that are emptied by the shift operation are filled with the sign bit
of the doubleword’s initial value. If the shift value is greater than 31, each doubleword
in the destination is filled with the sign bit of the doubleword’s initial value.
Mnemonic Opcode Description
PSRAD xmm1, xmm2/mem128 66 0F E2 /r Right-shifts packed doublewords in an XMM register by the
amount specified in the low 64 bits of an XMM register or
128-bit memory location.
PSRAD xmm, imm8 66 0F 72 /4 ib Right-shifts packed doublewords in an XMM register by the
amount specified in an immediate byte value.
294 PSRAD