| Commit message (Collapse) | Author | Age | Files | Lines |
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Improve error checking to warn on unexpected displacements as well.
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Fix CI.
a) Update canonical binaries.
b) Fix an out-of-bounds access in `clear-stream`. This also required supporting
a new instruction in `subx run` to load an imm8 into rm8.
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New helper: printing a byte in textual (hex) form.
This required adding instructions for bitwise shift operations.
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Crenshaw compiler now runs natively as well.
It turns out I was misreading the Intel manual, and the jump instructions
that I thought take disp16 operands actually take disp32 operands by default
on both i686 and x86_64 processors. The disp16 versions are some holdover
from the 16-bit days.
This was the first time I've used one of these erstwhile-disp16 instructions,
but I still haven't tested most of them. We'll see if we run into future
issues.
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Improve error-checking for unnecessary displacement operands.
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Check for duplicate docstrings.
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Include LEA (load effective address) in the SubX subset of x86 ISA.
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Attempt #3 at fixing CI.
In the process the feature gets a lot less half-baked.
Ridiculously misleading that we had `has_metadata()` was special-cased
to one specific transform. I suck.
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Streamline the factorial function; we don't need to save a stack variable
into a register before operating on it. All instructions can take a stack
variable directly.
In the process we found two bugs:
a) Opcode f7 was not implemented correctly. It was internally consistent
but I'd never validated it against a natively running program. Turns out
it encodes multiple instructions, not just 'not'.
b) The way we look up imm32 operands was sometimes reading them before
disp8/disp32 operands.
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The new example ex9 doesn't yet work natively.
In the process I've emulated the kernel's role in providing args, implemented
a couple of instructions acting on 8-bit operands (useful for ASCII string
operations), and begun the start of the standard library (ascii_length
is the same as strlen).
At the level of SubX we're just only going to support ASCII.
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More tweaks for check passes. Ensure they're never first-class
transforms.
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Reorganize layers in accordance with the plan in layer 29.
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