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 346 RCPSS 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 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.
26568—Rev. 3.05—September 2003 AMD64 Technology RSQRTPS Reciprocal Square Root Packed Single-Precision Floating-Point Computes the approximate reciprocal of the square root of each of the four packed single-precision floating-point values in an XMM register or 128-bit memory location and writes the result in the corresponding doubleword of another XMM register. 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 square root. A source value that is ±zero or denormal returns an infinity of the source value’s sign. Negative source values other than –zero and –denormal return a QNaN floatingpoint indefinite value (“Indefinite Values” in Volume 1). For both SNaN and QNaN source operands, a QNaN is returned. Mnemonic Opcode Description RSQRTPS xmm1, xmm2/mem128 0F 52 /r Computes reciprocals of square roots of packed single-precision floating-point values in an XMM register or 128-bit memory location and writes the result in the destination XMM register. Related Instructions xmm1 xmm2/mem128 127 96 95 64 63 32 31 0 RSQRTSS, SQRTPD, SQRTPS, SQRTSD, SQRTSS 127 96 95 64 63 32 31 0 reciprocal square root reciprocal square root reciprocal square root reciprocal square root rsqrtps.eps RSQRTPS 347
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