Search

Search Results for:

Search Results: 87

  1. Possible XED Decode Bug (from Pin rev 65163)

    https://software.intel.com/en-us/forums/intel-isa-extensions/topic/520628

    Aug 22, 2014 ... The problem appears to be that XED will more than one REX prefix and generate an instruction. For example: 41-40-26-E8-77-70-C5-A2

  2. Developer's manual: 0x66 0xF2 instruction prefixes

    https://software.intel.com/en-us/search/gss/rex%20prefix

    Intel® AVX introduces a new prefix, referred to as VEX, in the Intel® 64 and ... of REX prefix functionality. compaction of SIMD prefix functionality and escape byte  ...

  3. Developer's manual: 0x66 0xF2 instruction prefixes

    https://software.intel.com/en-us/forums/watercooler-catchall/topic/498567

    3EH—DS segment override prefix (use with any branch instruction is ... prefixes ( exception to this is discussed in Section 2.2.1, “REX Prefixes”).

  4. question on avx instruction encoding

    https://software.intel.com/en-us/forums/intel-isa-extensions/topic/292273

    so any instruction that can be encoded with a two byte vex prefix can be encoded with a ... In SSE, the 4th bit came from the REX prefix fields.

  5. XED2: XED2 User Guide - Wed Jan 2 23:48:56 2013

    https://software.intel.com/sites/landingpage/pintool/docs/56759/Xed/html/xed-ild_8h-source.html

    Jan 2, 2013 ... There is only one rex prefix that is used; 00116 but any rex-s that are mixed-in with the legacy prefixes are 00117 ignored! We must count them.

  6. XED2: XED2 User Guide - Wed Aug 8 00:23:42 2012

    https://software.intel.com/sites/landingpage/pintool/docs/53271/Xed/html/xed-ild_8h-source.html

    Aug 8, 2012 ... There is only one rex prefix that is used; 00111 but any rex-s that are mixed-in with the legacy prefixes are 00112 ignored! We must count them.

  7. XED: xed-error-enum.h File Reference

    https://software.intel.com/sites/landingpage/pintool/docs/71313/Xed/html/xed-error-enum_8h.html

    Jan 21, 2015 ... XED_ERROR_BAD_REX_PREFIX, A REX prefix was found where none is allowed. XED_ERROR_BAD_EVEX_UBIT, An illegal value for the ...

  8. XED2: XED2 User Guide - Wed Jan 2 23:48:57 2013

    https://software.intel.com/sites/landingpage/pintool/docs/56759/Xed/html/group__OPERANDS.html

    Jan 2, 2013 ... True if the instruction as a F3 REP prefix (used for opcode refining, for rep for string .... This instruction has a REX prefix with the W bit set.

  9. XED: xed-operand-values-interface.h File Reference

    https://software.intel.com/sites/landingpage/pintool/docs/62732/Xed/html/xed-operand-values-interface_8h.html

    Dec 26, 2013 ... True if the instruction as a F3 REP prefix (used for opcode refining, for rep for string .... This instruction has a REX prefix with the W bit set.

  10. Introduction to x64 Assembly | Intel® Software

    https://software.intel.com/en-us/articles/introduction-to-x64-assembly

    Mar 19, 2012 ... There are odd limitations accessing the byte registers due to coding issues in the REX opcode prefix used for the new registers: an instruction ...

  11. Intel® Software Development Emulator | Intel® Software

    https://software.intel.com/en-us/articles/intel-software-development-emulator

    Jun 15, 2012 ... *rex_prefix Instructions with a REX prefix (includes the following 4 cases). REX prefixes can be sued without any of the following 4 bits set as ...

  12. Google VP9 Optimization | Intel® Software

    https://software.intel.com/en-us/articles/google-vp9-optimization?language=fr

    Mar 25, 2016 ... Quite often a 4th prefix is added when any of the upper 8 xmm ... and “ pmaddubsw xmm1, xmm16 ” will add the REX prefix – “66 41 0F 38 04 ...

  13. XED2: XED2 User Guide - Wed Aug 8 00:23:42 2012

    https://software.intel.com/sites/landingpage/pintool/docs/53271/Xed/html/main.html

    Aug 8, 2012 ... REX prefix byte. Only in 64b mode. It has 4 1-bit fields: W, R, X, and B. The W bit modifies the operation width. The R, X and B fields extend the ...

  14. Details of Intel® Advanced Vector Extensions Intrinsics | Intel ...

    https://software.intel.com/en-us/node/695167?language=es

    Instruction encoding format using a new prefix (referred to as VEX) to provide ... vector lengths, compaction of legacy SIMD prefixes and REX functionality.

  15. The structure of ModR/M byte

    https://software.intel.com/en-us/forums/intel-isa-extensions/topic/288149

    Aug 17, 2010 ... ... using register extension field in the MOD R/M byte are not encodable in 64-bit mode because the opcodes are treated as REX prefixes.

  16. Behavior of IMUL regarding SF

    https://software.intel.com/en-us/forums/watercooler-catchall/topic/556870

    Apr 27, 2015 ... My program uses the second form (48 0f af c1, 48 being the REX.W prefix). I know that the one-operand form places its result in D and A and ...

  17. Intel(R) Advanced Vector Extensions Programming Reference

    https://software.intel.com/sites/default/files/m/f/7/c/36945

    1-3. 1.3.3. VEX Prefix Instruction Encoding Support . .... YMM State, VEX Prefix and Supported Operating Modes . ... 4-2. 4.1.3. VEX and the REX prefix .

  18. Intel® X86 Encoder Decoder

    https://software.intel.com/sites/landingpage/xed/ref-manual/html/index.html

    by Mark Charney. 2016-02-02. Introduction. Intel® XED is an acronym for Intel® X86 Encoder Decoder. The latter part is pronounced like the (British) English "z".

  19. Intel® AVX-512 instructions | Intel® Software

    https://software.intel.com/en-us/blogs/2013/avx-512-instructions

    Jul 23, 2013 ... Intel AVX instructions use the VEX prefix while Intel AVX-512 .... is missing B' and X' bits to extend the B and X bits of the REX prefix. So we

  20. Branch instructions in 64 bit mode

    https://software.intel.com/en-us/forums/intel-isa-extensions/topic/288370

    Aug 3, 2010 ... These instructions update the 64-bit RIP without the need for a REX operand-size prefix.The following aspects of near branches are controlled ...

For more complete information about compiler optimizations, see our Optimization Notice.