Intel® 64 and IA-32 Architectures Optimization Reference Manual

OPTIMIZING FOR SIMD INTEGER APPLICATIONSExample 5-9. PEXTRW Instruction Code; Input:; eax source value; immediate value: “0”; Output:; edx 32-bit integer register containing the; extracted word in the low-order bits &; the high-order bits zero-extendedmovq mm0, [eax]pextrw edx, mm0, 05.4.7 Insert WordThe PINSRW instruction loads a word from the lower half of a 32-bit integer registeror from memory and inserts it in an MMX technology destination register at a positiondefined by the two least significant bits of the immediate constant. Insertion is donein such a way that three other words from the destination register are left untouched.See Figure 5-6 and Example 5-10.MM6331 0X4 X3 Y1 X1R3231 0Y2Y1OM15164Figure 5-6. PINSRW Instruction5-13