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Asmjit superoptimiser

Makefile 1.49% C++ 96.53% Shell 1.56% C 0.42%

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ajs's Issues

Allow for dependencies on multiple lines.

For example

    add %rax,%rbx
    adc %rcx,%rdx
    add %r8,%r9
    ret

should also have a valid reordering with the 3rd line at the start, but currently this is not possible as there is a dependency chain.

Explore multithreading possibilities

Should be possible for tryPerms to be parallelised for quicker optimisation.

Add limit to permutations tried option

Useful for doing bulk testing runs (without getting stuck on popcount...)

Add loop detection and selection

Fix transforming swaps for sequences like

lea %rax,(%rax,2)
inc %rax

Allow more reordering when flags are written twice in a row

For example

    add $1,%rax
    add $1,%rbx
    add $1,%rcx
    jnc end
end:
    ret

should have two rearrangements.

Make dependency updates work better for nops

by incrementing indices rather than recalculating

Allow labels in memory address syntax

For example in mpn/store there is lea lp(%rax).

Make standard error function

Or use some existing library one

Add as many implicit register uses as possible

For example div instructions probably have some

Add make dependencies for header files

So that changing them will cause make to remake things (useful for asmjit options)

Add option to prune unused labels

Otherwise these can tend to accumulate when automatically adding global definitions

Preserve labels

Make the output have original label names, as opposed to L1, L2, etc.
This will require changes to alexjbest/asmjit also

Cant compile on Ubuntu 16.10

g++ -c -I. -I/home/x/asmjit/src/ -I/home/x/sources/gmp-6.1.1/ -I/home/x/build/gmp-6.1.1/ -o line.o line.cpp -g -O2 --std=c++0x -Wall
In file included from line.cpp:2:0:
line.h:32:26: error: ‘kInstIdNone’ is not a member of ‘asmjit’
     Line(uint32_t inst = asmjit::kInstIdNone):
                          ^~~~~~
line.h: In constructor ‘Line::Line(uint32_t)’:
line.h:34:14: error: ‘noOperand’ is not a member of ‘asmjit’
         ops({asmjit::noOperand, asmjit::noOperand, asmjit::noOperand}),
              ^~~~~~
line.h:34:33: error: ‘noOperand’ is not a member of ‘asmjit’
         ops({asmjit::noOperand, asmjit::noOperand, asmjit::noOperand}),
                                 ^~~~~~
line.h:34:52: error: ‘noOperand’ is not a member of ‘asmjit’
         ops({asmjit::noOperand, asmjit::noOperand, asmjit::noOperand}),
                                                    ^~~~~~
line.h:41:46: error: invalid initializer for array member ‘asmjit::Operand Line::ops [4]’
         regsOut(std::vector<asmjit::X86Reg>()) {
                                              ^
line.cpp: In member function ‘int Line::isInstruction() const’:
line.cpp:59:25: error: ‘kInstIdNone’ is not a member of ‘asmjit’
   return instruction != asmjit::kInstIdNone;
                         ^~~~~~
line.cpp: In member function ‘int Line::isLabel() const’:
line.cpp:63:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   return label != -1;
          ~~~~~~^~~~~
line.cpp: In member function ‘void Line::setLabel(uint32_t)’:
line.cpp:94:17: error: ‘kInstIdNone’ is not a member of ‘asmjit’
   instruction = asmjit::kInstIdNone;
                 ^~~~~~
line.cpp: In member function ‘void Line::setAlign(uint8_t)’:
line.cpp:101:17: error: ‘kInstIdNone’ is not a member of ‘asmjit’
   instruction = asmjit::kInstIdNone;
                 ^~~~~~
line.cpp: In member function ‘void Line::setByte(uint8_t)’:
line.cpp:108:17: error: ‘kInstIdNone’ is not a member of ‘asmjit’
   instruction = asmjit::kInstIdNone;
                 ^~~~~~
line.cpp: In member function ‘void Line::addRegIn(asmjit::X86Reg)’:
line.cpp:122:11: error: ‘X86GpReg’ is not a member of ‘asmjit’
     reg = asmjit::X86GpReg(asmjit::kX86RegTypeGpq, reg.getRegIndex(), 8);
           ^~~~~~
line.cpp:122:28: error: ‘kX86RegTypeGpq’ is not a member of ‘asmjit’
     reg = asmjit::X86GpReg(asmjit::kX86RegTypeGpq, reg.getRegIndex(), 8);
                            ^~~~~~
line.cpp:122:56: error: ‘class asmjit::X86Reg’ has no member named ‘getRegIndex’
     reg = asmjit::X86GpReg(asmjit::kX86RegTypeGpq, reg.getRegIndex(), 8);
                                                        ^~~~~~~~~~~
line.cpp:125:11: error: ‘X86ZmmReg’ is not a member of ‘asmjit’
     reg = asmjit::X86ZmmReg(asmjit::kX86RegTypeZmm, reg.getRegIndex(), 64);
           ^~~~~~
line.cpp:125:29: error: ‘kX86RegTypeZmm’ is not a member of ‘asmjit’
     reg = asmjit::X86ZmmReg(asmjit::kX86RegTypeZmm, reg.getRegIndex(), 64);
                             ^~~~~~
line.cpp:125:57: error: ‘class asmjit::X86Reg’ has no member named ‘getRegIndex’
     reg = asmjit::X86ZmmReg(asmjit::kX86RegTypeZmm, reg.getRegIndex(), 64);
                                                         ^~~~~~~~~~~
line.cpp: In member function ‘void Line::addRegOut(asmjit::X86Reg)’:
line.cpp:132:11: error: ‘X86GpReg’ is not a member of ‘asmjit’
     reg = asmjit::X86GpReg(asmjit::kX86RegTypeGpq, reg.getRegIndex(), 8);
           ^~~~~~
line.cpp:132:28: error: ‘kX86RegTypeGpq’ is not a member of ‘asmjit’
     reg = asmjit::X86GpReg(asmjit::kX86RegTypeGpq, reg.getRegIndex(), 8);
                            ^~~~~~
line.cpp:132:56: error: ‘class asmjit::X86Reg’ has no member named ‘getRegIndex’
     reg = asmjit::X86GpReg(asmjit::kX86RegTypeGpq, reg.getRegIndex(), 8);
                                                        ^~~~~~~~~~~
line.cpp:135:11: error: ‘X86ZmmReg’ is not a member of ‘asmjit’
     reg = asmjit::X86ZmmReg(asmjit::kX86RegTypeZmm, reg.getRegIndex(), 64);
           ^~~~~~
line.cpp:135:29: error: ‘kX86RegTypeZmm’ is not a member of ‘asmjit’
     reg = asmjit::X86ZmmReg(asmjit::kX86RegTypeZmm, reg.getRegIndex(), 64);
                             ^~~~~~
line.cpp:135:57: error: ‘class asmjit::X86Reg’ has no member named ‘getRegIndex’
     reg = asmjit::X86ZmmReg(asmjit::kX86RegTypeZmm, reg.getRegIndex(), 64);
                                                         ^~~~~~~~~~~
Makefile:44: recipe for target 'line.o' failed
make: *** [line.o] Error 1

Add transforming swaps

I.e. inc %rax and mov (%rax),%rbx should be swappable, but with the second instruction changing.

Add verification when timings drop

Fix bug with nop output

Allow for more complicated arithmetic in memory addresses

I.e. for sub_n we have lea rdi,[rdi+(8*(1 << 4))].

Possibly allow for output signature specification

This may or may not be useful.

Could be used to determine if dependencies are real or not e.g.

mov $1,%rax
mov $2,%rax
ret

can be rearranged if %rax is not part of the output.

Fix manual dependencies

This is broken for (at least) intel syntax mode

Check if there are additional gas or yasm directives that are important

Don't set regsRead for overwriting instructions

Add support for repz ret

Finish adding all mpn function signatures and all mpn functions to a signature file

Allow for more complicated ranges to be specified

Such as:

Multiple intervals
Interval and loop
Intervals up to and including loops

Add help option and usage message

Add support for `shr` without a distance.

Check if any other base for immediate values is needed

E.g. binary

Add error checking/bounds for cpu selection

Move registers to a separate file and add ymms etc. for completeness.

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