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2021-03-21in real programs, having read_operands inlined hurts performance!iximeow
the in-repo benchmark got better with this inlined but it's probably better to leave it up to the compiler when finally stitching stuff together. i suspect that having read_operands inlined resulted in just too many live values, and the compiler was inspired to play hijinks that pipelined poorly. disas-bench shows a ~15% improvement from this change.
2021-03-21fuzzing shows resetting operands is not beneficialiximeow
2021-03-21fix potential successful decodes with Opcode::Invalidiximeow
vmov* are.. somehow messed up too
2021-03-21add tsxldtrkiximeow
does intel know no bounds
2021-03-21xed says setssbsy and saveprevssp are more permissiveiximeow
2021-03-21add missing vpmaxuw, remove nonsense avx moviximeow
2021-03-21complete CET support, add UINTR, add missing VORP{S,D}, other cleanupiximeow
2021-03-21add waitpkg, clean up unused values, old commentsiximeow
2021-03-21add tdxiximeow
decoder flag to come
2021-03-21rewrite 0f-based instruction handlingiximeow
this is... a more significant rewrite than i expected yaxpeax-x86 to ever need. it turns out that capstone is extremely permissive about duplicative 66/f2/f3 prefixes to the point that the implemented prefex handling was unsalvageable. while this replaces the *0f* opcode tables, i haven't profiled these changes. it's possible this is a net improvement for single-byte opcodes, it could be a net loss. code size may be severely impacted. there is still work to do. but this in total gets very close to iced/xed/zydis parity, far more than before. also adds several small extensions, gfni, 3dnow, enqcmd, invpcid, some of cet, and a few missing avx instructions.
2021-03-17support several new extensions, 3dnow, and nuance in invalid operandsiximeow
2021-03-14alternate display mode for c-style expressionsiximeow
2021-03-13split ffi crate to support distinct 16, 32, and 64-bit buildsiximeow
initial work to optionally discard any instruction printing support when using `-Z build-std` to fully remove .eh_frame, a stripped long_mode_no_fmt .so is 61kb!
2021-01-15support xchg AX/reg0.1.5iximeow
2021-01-15small perf tweaksiximeow
clearing reg_rrr and reg_mmm more efficiently is an extremely small win, but a win read_imm_signed generally should inline well and runs afoul of some heuristic. inlining gets about 8% improved throughput on the (unrealistic) in-repo benchmark it would be great to be able to avoid bounds checks somehow; it looks like they alone are another ~10% of decode time. i'm not sure how to pull that off while retaining the generic iterator parameter. might just not be possible.
2021-01-15fix several missing or invalid decodings among 0f01 opcodesiximeow
* `mwaitx`, `monitorx`, `rdpru`, and `clzero` are now supported * swapgs is no longer decoded in protected mode * rdpkru and wrpkru are no longer decoded if mod bits != 11
2020-11-19fix decoding of rex-prefixed modrm+sib operands selecting index 0b100 and ↵0.1.4iximeow
base 0b101 for memory operands with a base, index, and displacement either the wrong base would be selected (register number ignored, so only `*ax` or `r8*` would be reported), or yaxpeax-x86 would report a base register is present when it is not (`RegIndexBaseScaleDisp` when the operand is actually `RegScaleDisp`) thank you to Evan Johnson for catching and reporting this bug! also bump crate version to 0.1.4 as this will be immediately tagged and released.
2020-10-27fix misdecode of instructions in opcode 0x800.1.3iximeow
2020-08-15add RegSpec constructors, consts, and const fns0.1.2iximeow
2020-08-15add register class constants to allow reasoning about register operands0.1.1iximeow
also bump to 0.1.1
2020-08-09inaugural 0.1.0 release!0.1.0iximeow
add doc comments for public items, record changelog, and lets ship this!!
2020-08-09adjust public interface: public items should all be stableiximeow
`OperandCode` (obviously) wildly varies depending on how i feel on a given week, so it's now hidden to avoid people depending on numerical values of its discriminants. `RegisterBank` got a similar treatment with a new `RegisterClass` struct that's suitable for public use.
2020-08-09reject instructions made invalid by lock prefixesiximeow
2020-08-09support salc, get segment register numbers rightiximeow
2020-08-09unused importiximeow
2020-08-09no more incomplete decoder for vex instructionsiximeow
for now
2020-08-09support four-reg operand forms, new testsiximeow
2020-08-09avoid a bunch of checks in the likely display pathiximeow
rep_any will get speculated `false` quite quickly, whereas checking if the opcode is a string instruction will be costly no matter what. in the rare case rep_any is true, i don't care how costly displaying the instruction is - string instructions are relatively rare, and rep movs is typically not more than one instance when it shows up.
2020-08-09display opt, aykmiximeow
the arms of the match in regspec_label referenced tables that were not const. consequently, they would be rebuilt when reached, every time the match is incanted. this holds through even when regspec_label is inlined. each arm could be a const array for a small and easy change, but to avoid the indirect dispatch on spec.bank i've reorganized register names into a single const array and selected values for `RegisterBank` such that indices into that array can be formed. for my next trick, i may make `REG_NAMES` a `*const u8`, with indices picking offsets into the table - 8-byte offsets might do? this should compact down size a little more by removing a pointer and size qword for each string.
2020-08-09significantly reorganize what operands are unlikelyiximeow
likely operands are now also required to have contiguous special cases 0..31. this is to avoid generating a massively sparse jump table for no reason twice - once for unlikely_operands is quite enough as-is. this will undoubtedly be a wildly annoying maintenance burden. if this pans out (initial expiriments suggest it might) then maybe a macro will do...
2020-08-09those operands are unlikelyiximeow
2020-08-09Revert "speculative code motion"iximeow
This reverts commit 21cc850afc108c147871c70240eda62ad13f34e0.
2020-08-09speculative code motioniximeow
2020-08-09Revert "bad idea"iximeow
This reverts commit 23cbcb390c723c4c39113ce93ccff89308b6623c.
2020-08-09bad ideaiximeow
2020-08-09try to special case immediates a bitiximeow
2020-08-09centralize mem_oper assignment where possibleiximeow
2020-08-09special-case lea validity check betteriximeow
2020-08-09this makes it faster i guessiximeow
2020-08-09make address_size() no longer .. necessaryiximeow
2020-08-09more speed hole!iximeow
2020-08-09drilled a new speed hole: rex doesn't need to be held through read_M or read_sibiximeow
2020-08-09crank up the inlineriximeow
2020-08-09cmc and int1iximeow
2020-08-09invalid instruction fixiximeow
2020-08-09lea speed holeiximeow
2020-08-09speed holesiximeow
2020-08-09vinserti128iximeow
2020-08-09vextractf128iximeow
2020-08-09vpsrlqiximeow