x86 Instruction Set Reference

# DIVPS

# Divide Packed Single-Precision Floating-Point Values

Opcode Mnemonic Description
0F 5E /r DIVPS xmm1, xmm2/m128 Divide packed single-precision floating-point values in xmm1 by packed single-precision floating-point values xmm2/m128.

# Description

Performs an SIMD divide of the two packed single-precision floating-point values in the destination operand (first operand) by the two packed single-precision floating-point values in the source operand (second operand), and stores the packed single-precision floating-point results in the destination operand. The source operand can be an XMM register or a 128-bit memory location. The destination operand is an XMM register. See Figure 10-5 in the IA-32 Intel Architecture Software Developer's Manual, Volume 1 for an illustration of an SIMD single-precision floating-point operation.

# Operation

Destination[0..31] = Destination[0..31] / Source[0..31];
Destination[32..63] = Destination[32..63] / Source[32..63];
Destination[64..95] = Destination[64..95] / Source[64..95];
Destination[96..127] = Destination[96..127] / Source[96..127];
1
2
3
4
5

# SIMD Floating-Point Exceptions

Overflow, Underflow, Invalid, Divide-by-Zero, Precision, Denormal.

# Protected Mode Exceptions
#GP(0) For an illegal memory operand effective address in the CS, DS, ES, FS or GS segments. If a memory operand is not aligned on a 16-byte boundary, regardless of segment.
#GP(0) For an illegal memory operand effective address in the CS, DS, ES, FS or GS segments. If a memory operand is not aligned on a 16-byte boundary, regardless of segment.
#SS(0) For an illegal address in the SS segment.
#PF(fault-code) For a page fault.
#NM If TS in CR0 is set.
#XM If an unmasked SIMD floating-point exception and OSXMMEXCPT in CR4 is 1.

# Real-Address Mode Exceptions
#GP(0) If a memory operand is not aligned on a 16-byte boundary, regardless of segment. If any part of the operand lies outside the effective address space from 0 to FFFFH.
#GP(0) If a memory operand is not aligned on a 16-byte boundary, regardless of segment. If any part of the operand lies outside the effective address space from 0 to FFFFH.
#NM If TS in CR0 is set.
#XM If an unmasked SIMD floating-point exception and OSXMMEXCPT in CR4 is 1.

# Virtual-8086 Mode Exceptions

Same exceptions as in Real Address Mode
#PF(fault-code) For a page fault.
Instruction Latency Throughput Execution Unit
CPUID 0F3n/0F2n/069n 0F3n/0F2n/069n 0F2n
DIVPS xmm, xmm 40/39/18+17 40/39/36 FP_DIV

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