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RE: [PATCH 0/7] ARC: Change max instruction length to 64 bits
- From: Claudiu Zissulescu <Claudiu dot Zissulescu at synopsys dot com>
- To: Graham Markall <graham dot markall at embecosm dot com>, "binutils at sourceware dot org" <binutils at sourceware dot org>
- Cc: "noamca at mellanox dot com" <noamca at mellanox dot com>, "rinat at mellanox dot com" <rinat at mellanox dot com>, "guybe at mellanox dot com" <guybe at mellanox dot com>, "andrew dot burgess at embecosm dot com" <andrew dot burgess at embecosm dot com>
- Date: Wed, 26 Oct 2016 14:46:47 +0000
- Subject: RE: [PATCH 0/7] ARC: Change max instruction length to 64 bits
- Authentication-results: sourceware.org; auth=none
- References: <email@example.com>
This is a sizeable patch, did u check if Linux builds and runs after applying your patch. Also did you tested it for 32-bit machines?
> -----Original Message-----
> From: Graham Markall [mailto:firstname.lastname@example.org]
> Sent: Wednesday, October 26, 2016 2:46 PM
> To: email@example.com
> Cc: firstname.lastname@example.org; email@example.com;
> firstname.lastname@example.org; email@example.com;
> firstname.lastname@example.org; Graham Markall
> Subject: [PATCH 0/7] ARC: Change max instruction length to 64 bits
> The current handling for arc instructions longer than 32-bits is all
> handled as a special case in both the assembler and disassembler.
> The problem with this approach is that it leads to code duplication.
> Selecting a long instruction should be exactly the same process as
> selecting a short instruction, except over more bits. In both cases we
> select based on bit comparison, and initial operand insertion and
> In the existing implementation, only some of the logic for selecting
> instructions is duplicated from the short instruction case to the long
> instruction case - in particular, iterating over candidate instructions
> with the same mnemonic is only possible for short instructions. This
> precludes the implementation of NPS-400 Accelerator instructions which
> are 48- and 64-bits long and have multiple variants with different
> operand lists.
> Rather than attempting to duplicate the remaining logic from short
> instructions to long instructions, this series of patches unifies both
> the long and short instruction worlds, converting the core opcodes
> library from being largely 32-bit focused, to being 64-bit focused.
> This series includes patches that:
> - Fix some instruction masks that were incorrect. These incorrect masks
> caused no problems in the existing implementation, but changes in some
> of the patches in this series highlighted the issue, so a correction
> to these masks is included first.
> - Make a small change to print_insn_arc to swap highbyte and lowbyte,
> which were consistently used to mean the opposite of their names. This
> change is made here to make subsequent changes more logical.
> - Convert the opcodes implementation and supporting functionality to
> operate on 64-bit instructions. The special-case handling and
> duplicated logic for instructions that were previously considered
> "long" is removed.
> - Add an implementation of the dcmac instruction for NPS-400, which
> could not be implemented prior to the change to 64-bit opcodes since
> it has multiple variants with different operands that need to be
> iterated over to select the correct one.
> All patches in the series have been tested and pass with ARC big- and
> Andrew Burgess (2):
> arc/opcodes/nps400: Fix some instruction masks
> arc: Change max instruction length to 64-bits
> Graham Markall (5):
> gas/arc: Replace short_insn flag with insn length field
> arc: Replace ARC_SHORT macro with arc_opcode_len function
> opcodes/arc: Make some macros 64-bit safe
> arc: Swap highbyte and lowbyte in print_insn_arc
> arc: Implement NPS-400 dcmac instruction
> gas/ChangeLog | 33 ++
> gas/config/tc-arc.c | 214 +++-------
> gas/testsuite/gas/arc/nps400-9.d | 44 +++
> gas/testsuite/gas/arc/nps400-9.s | 51 +++
> include/ChangeLog | 21 +
> include/opcode/arc.h | 97 ++---
> opcodes/ChangeLog | 56 +++
> opcodes/arc-dis.c | 481 +++++++++--------------
> opcodes/arc-ext.c | 2 +-
> opcodes/arc-ext.h | 2 +-
> opcodes/arc-fxi.h | 366 ++++++++---------
> opcodes/arc-nps400-tbl.h | 99 ++++-
> opcodes/arc-opc.c | 829 +++++++++++++++++----------------------
> 13 files changed, 1105 insertions(+), 1190 deletions(-)
> create mode 100644 gas/testsuite/gas/arc/nps400-9.d
> create mode 100644 gas/testsuite/gas/arc/nps400-9.s