x86 Instruction Set Reference

# PMULHUW

# Multiply Packed Unsigned Integers and Store High Result

Opcode Mnemonic Description
0F E4 /r PMULHUW mm1, mm2/m64 Multiply the packed unsigned word integers in mm1 register and mm2/m64, and store the high 16 bits of the results in mm1.
66 0F E4 /r PMULHUW xmm1, xmm2/m128 Multiply the packed unsigned word integers in xmm1 and xmm2/m128, and store the high 16 bits of the results in xmm1.

# Description

Performs an SIMD unsigned multiply of the packed unsigned word integers in the destination operand (first operand) and the source operand (second operand), and stores the high 16 bits of each 32-bit intermediate results in the destination operand. (Figure 4-3 shows this operation when using 64-bit operands.) The source operand can be an MMX technology register or a 64- bit memory location, or it can be an XMM register or a 128-bit memory location. The destination operand can be an MMX technology register or an XMM register.

# Operation

if(OperandSize == 64) {
//PMULHUW instruction with 64-bit operands:
	//Unsigned multiplication
	Temporary0[0..31] = Destination[0..15] * Source[0..15];
	Temporary1[0..31] = Destination[16..31] * Source[16..31];
	Temporary2[0..31] = Destination[32..47] * Source[32..47];
	Temporary3[0..31] = Destination[48..63] * Source[48..63];
	Destination[0..15] = Temporary0[16..31];
	Destination[16..31] = Temporary1[16..31];
	Destination[32..47] = Temporary2[16..31];
	Destination[48..63] = Temporary3[16..31];
}
else {
	//PMULHUW instruction with 128-bit operands:
	//Unsigned multiplication
	Temporary0[0..31] = Destination[0..15] * Source[0..15];
	Temporary1[0..31] = Destination[16..31] * Source[16..31];
	Temporary2[0..31] = Destination[32..47] * Source[32..47];
	Temporary3[0..31] = Destination[48..63] * Source[48..63];
	Temporary4[0..31] = Destination[64..79] * Source[64..79];
	Temporary5[0..31] = Destination[80..95] * Source[80..95];
	Temporary6[0..31] = Destination[96..111] * Source[96..111];
	Temporary7[0..31] = Destination[112..127] * Source[112..127];
	Destination[0..15] = Temporary0[16..31];
	Destination[16..31] = Temporary1[16..31];
	Destination[32..47] = Temporary2[16..31];
	Destination[48..63] = Temporary3[16..31];
	Destination[64..79] = Temporary4[16..31];
	Destination[80..95] = Temporary5[16..31];
	Destination[96..111] = Temporary6[16..31];
	Destination[112..127] = Temporary7[16..31];
}
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# Flags affected

None.

# Protected Mode Exceptions
#GP(0) If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit. (128-bit operations only) If a memory operand is not aligned on a 16-byte boundary, regardless of segment.
#GP(0) If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit. (128-bit operations only) If a memory operand is not aligned on a 16-byte boundary, regardless of segment.
#SS(0) If a memory operand effective address is outside the SS segment limit.
#UD If EM in CR0 is set. (128-bit operations only) If OSFXSR in CR4 is 0. (128-bit operations only) If CPUID feature flag SSE2 is 0.
#NM If TS in CR0 is set.
#MF (64-bit operations only) If there is a pending x87 FPU exception.
#PF(fault-code) If a page fault occurs.

# Real-Address Mode Exceptions
#GP(0) (128-bit operations only) If a memory operand is not aligned on a 16-byte boundary, regardless of segment. If any part of the operand lies outside of the effective address space from 0 to FFFFH.
#GP(0) (128-bit operations only) If a memory operand is not aligned on a 16-byte boundary, regardless of segment. If any part of the operand lies outside of the effective address space from 0 to FFFFH.
#UD If EM in CR0 is set. (128-bit operations only) If OSFXSR in CR4 is 0. (128-bit operations only) If CPUID feature flag SSE2 is 0.
#NM If TS in CR0 is set.
Instruction Latency Throughput Execution Unit
CPUID 0F3n/0F2n/069n 0F3n/0F2n/069n 0F2n
PMULHUW mm, mm 9/8/- 1/1/- FP_MUL
PMULHUW xmm, xmm 9/8/3+1 2/2/2 FP_MUL

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