DIVSS (Divide Scalar Single-Precision Floating-Point Values)

Opcodes

Opcode/Instruction Op/En 64/32-bit Mode CPUID Feature Flag Description
F3 0F 5E /r DIVSS xmm1, xmm2/m32 RM V/V SSE Divide low single-precision floating-point value in xmm1 by low single-precision floating-point value in xmm2/m32.
VEX.NDS.LIG.F3.0F.WIG 5E /r VDIVSS xmm1, xmm2, xmm3/m32 RVM V/V AVX Divide low single-precision floating point value in xmm2 by low single precision floating-point value in xmm3/m32.

Instruction Operand Encoding

Op/En Operand 1 Operand 2 Operand 3 Operand 4
RM ModRM:reg (r, w) ModRM:r/m (r) NA NA
RVM ModRM:reg (w) VEX.vvvv (r) ModRM:r/m (r) NA

Description

Divides the low single-precision floating-point value in the first source operand by the low single-precision floating-point value in the second source operand, and stores the single-precision floating-point result in the destination operand. The second source operand can be an XMM register or a 32-bit memory location. The first source and destination operands are XMM registers. The three high-order doublewords of the destination are copied from the same dwords of the first source operand. See Chapter 10 in the Intel® 64 and IA-32 Architectures Software Devel-oper’s Manual, Volume 1, for an overview of a scalar single-precision floating-point operation.

In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15).

128-bit Legacy SSE version: The first source operand and the destination operand are the same. Bits (VLMAX-1:32) of the corresponding YMM destination register remain unchanged.

VEX.128 encoded version: Bits (VLMAX-1:128) of the destination YMM register are zeroed.

Operation

DIVSS (128-bit Legacy SSE version)

DEST[31:0] ← DEST[31:0] / SRC[31:0]
DEST[VLMAX-1:32] (Unmodified)

VDIVSS (VEX.128 encoded version)

DEST[31:0] ← SRC1[31:0] / SRC2[31:0]
DEST[127:32] ← SRC1[127:32]
DEST[VLMAX-1:128] ← 0

Intel C/C++ Compiler Intrinsic Equivalent

DIVSS:

__m128 _mm_div_ss(__m128 a, __m128 b)

SIMD Floating-Point Exceptions

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

Other Exceptions

See Exceptions Type 3.