On 02/22/2010 08:59 AM, Gaetano Mendola wrote: >>> ippsStdDev_32f(myRealVector, mySize,
> vex amd64->IR: unhandled instruction bytes: 0x48 0xF 0x5A 0x6 0x48 0xF Disassembling the first 4 bytes gives: rex.W cvtps2pd (%rsi),%xmm0 The problem is: "What is the meaning of the rex.W prefix on cvtps2pd?" The Intel manual http://www.intel.com/Assets/PDF/manual/253666.pdf (Intel® 64 and IA-32 Architectures Software Developer's Manual Volume 2A: Instruction Set Reference, A-M, December 2009) lists the four instructions: 66 0F 5A cvtpd2ps 0F 5A cvtps2pd F2 0F 5A cvtsd2ss F3 0F 5A cvtss2sd but there is no explicit listing for "48 0F 5A". The opcode cvtps2pd (0F 5A) is "convert two packed 32-bit floating point values in %xmm2/mem (source) to two packed 64-bit floating point values in %xmm1 (destination)". It is unclear what applying a rex.W prefix means. Does anybody know? -- ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Valgrind-users mailing list Valgrind-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/valgrind-users
