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AMD 64-Bit Technology 26568—Rev. 3.02—August 2002 DIVSS Divide Scalar Single-Precision Floating-Point Divides the single-precision floating-point value in the low-order doubleword of the first source operand by the single-precision floating-point value in the low-order doubleword of the second source operand and writes the result in the low-order doubleword of the destination (first source). The three high-order doublewords of the destination are not modified. The first source/destination operand is an XMM register. The second source operand is another XMM register or 128-bit memory location. Mnemonic Opcode Description DIVSS xmm1, xmm2/mem32 F3 0F 5E /r Divides low-order single-precision floating-point value in an XMM register by the low-order single-precision floating-point value in another XMM register or in a 32-bit memory location. xmm1 xmm2/mem32 127 32 31 0 127 32 31 0 divide divss.eps Related Instructions DIVPD, DIVPS, DIVSD rFLAGS Affected None 110 DIVSS
26568—Rev. 3.02—August 2002 AMD 64-Bit Technology MXCSR Flags Affected FZ RC PM UM OM ZM DM IM DAZ PE UE OE ZE DE IE Exceptions M M M M M M 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Note: A flag that can be set to one or zero is M (modified). Unaffected flags are blank. Exception Invalid opcode, #UD Real X Virtual 8086 Protected Cause of Exception X X The SSE instructions are not supported, as indicated by bit 25 of CPUID standard function 1. X X X The emulate bit (EM) of CR0 was set to 1. X X X The operating-system FXSAVE/FXRSTOR support bit (OSFXSR) of CR4 was cleared to 0. X X X There was an unmasked SIMD floating-point exception while CR4.OSXMMEXCPT = 0. See SIMD Floating-Point Exceptions, below, for details. Device not available, #NM X X X The task-switch bit (TS) of CR0 was set to 1. Stack, #SS X X X A memory address exceeded the stack segment limit or was non-canonical. General protection, #GP X X X A memory address exceeded a data segment limit or was non-canonical. X A null data segment was used to reference memory. Page fault, #PF X X A page fault resulted from the execution of the instruction. Alignment check, #AC X X An unaligned memory reference was performed while alignment checking was enabled. SIMD Floating-Point Exception, #XF Invalid-operation exception (IE) X X X There was an unmasked SIMD floating-point exception while CR4.OSXMMEXCPT = 1. See SIMD Floating-Point Exceptions, below, for details. SIMD Floating-Point Exceptions X X X X X X A source operand was an SNaN value. Zero was divided by zero. X X X ±infinity was divided by ±infinity. DIVSS 111
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