AMD x86-64 Architecture Programmer's Manual, Volume 4, 128-Bit ...

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AMD64 Technology 26568—Rev. 3.05—September 2003 MXCSR Flags Affected None Exceptions Exception Real Invalid opcode, #UD X 344 RCPPS X Virtual 8086 Protected Cause of Exception X X X X The SSE2 instructions are not supported, as indicated by bit 26 of CPUID standard function 1. The emulate bit (EM) of CR0 was set to 1. X X X The operating-system FXSAVE/FXRSTOR support bit (OSFXSR) of CR4 is cleared to 0. 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 X A memory address exceeded a data segment limit or was non-canonical. A null data segment was used to reference memory. X X X The memory operand was not aligned on a 16-byte boundary. Page fault, #PF X X A page fault resulted from the execution of the instruction.
26568—Rev. 3.05—September 2003 AMD64 Technology RCPSS Reciprocal Scalar Single-Precision Floating-Point Computes the approximate reciprocal of the low-order single-precision floating-point value in an XMM register or in a 32-bit memory location and writes the result in the low-order doubleword of another XMM register. The three high-order doublewords in the destination XMM register are not modified. The rounding control bits (RC) in the MXCSR register have no effect on the result. The maximum error is less than or equal to 1.5 * 2 –12 times the true reciprocal. A source value that is ±zero or denormal returns an infinity of the source value’s sign. Results that underflow are changed to signed zero. For both SNaN and QNaN source operands, a QNaN is returned. Mnemonic Opcode Description RCPSS xmm1, xmm2/mem32 F3 0F 53 /r Computes reciprocal of scalar single-precision floating-point value in an XMM register or 32-bit memory location and writes the result in the destination XMM register. Related Instructions RCPPS, RSQRTPS, RSQRTSS rFLAGS Affected None xmm1 xmm2/mem32 127 32 31 0 127 32 31 0 reciprocal rcpss.eps RCPSS 345
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