To keep cross-compiling straightforward, Cretonne shouldn't have any
behavior that depends on the host. This renames the "Native" calling
convention to "SystemV", which has a defined meaning for each target,
so that it's clear that the calling convention doesn't change
depending on what host Cretonne is running on.
* Add a pre-opt optimization to change constants into immediates.
This converts 'iadd' + 'iconst' into 'iadd_imm', and so on.
* Optimize away redundant `bint` instructions.
Cretonne has a concept of "Testable" values, which can be either boolean
or integer. When the an instruction needing a "Testable" value receives
the result of a `bint`, converting boolean to integer, eliminate the
`bint`, as it's redundant.
* Postopt: Optimize using CPU flags.
This introduces a post-legalization optimization pass which converts
compare+branch sequences to use flags values on CPUs which support it.
* Define a form of x86's `urm` that doesn't clobber FLAGS.
movzbl/movsbl/etc. don't clobber FLAGS; define a form of the `urm`
recipe that represents this.
* Implement a DCE pass.
This pass deletes instructions with no side effects and no results that
are used.
* Clarify ambiguity about "32-bit" and "64-bit" in comments.
* Add x86 encodings for icmp_imm.
* Add a testcase for postopt CPU flags optimization.
This covers the basic functionality of transforming compare+branch
sequences to use CPU flags.
* Pattern-match irsub_imm in preopt.
* First draft of TrapSink implementation.
* Add trap sink calls to 'trapif' and 'trapff' recipes.
* Add SourceLoc to trap sink calls, and add trap sink calls to all loads and stores.
* Add IntegerDivisionByZero trap to div recipe.
* Only emit load/store traps if 'notrap' flag is not set on the instruction.
* Update filetest machinery to add new trap sink functionality.
* Update filetests to include traps in output.
* Add a few more trap outputs to filetests.
* Add trap output to CLI tool.
While the specifics of these terms are debatable, "IR" generally
isn't incorrect in this context, and is the more widely recognized
term at this time.
See also the discussion in #267.
Fixes#267.
This prevents uses of undefined values from passsing through
unnoticed, and ensures that all aliases are ultimately resolved,
regardless of where they are defined.
Value aliases aren't instructions, so they don't have a location in the
CFG, so it's not meaningful to query whether a value alias is defined
within a loop.
It's easy to forget whether they mutate the value in place or return a
new value. Marking them #[must_use] will catch cases where they are used
incorrectly.
While there may be CPUs that have a domain crossing penalty here,
this also helps the generated code look more like the code produced
by other compilers.
EFLAGS is a subregister of RFLAGS. For consistency with GPRs where we
use the 64-bit names to refer to the registers, use the 64-bit name for
RFLAGS as well.
Mark loads from globals generated by cton_wasm or by legalization as
`aligned` and `notrap`, since memory for these globals should be
allocated by the runtime environment for that purpose. This reduces
the number of potentially trapping instructions, which can reduce
the amount of metadata required by embedding environments.
* add x86 encodings for shift-immediate instructions
implements encodings for ishl_imm, sshr_imm, and ushr_imm. uses 8-bit immediates.
added tests for the encodings to intel/binary64.cton. Canonical versions
come from llvm-mc.
* translate test to use shift-immediates
* shift immediate encodings: use enc_i32_i64
and note why the regular shift encodings cant use it above
* add additional encoding tests for shift immediates
this covers 32 bit mode, and 64 bit operations in 64 bit mode.
There appear to be underlying problems with the way Cretonne handles value
aliases, which are causing problems for LICM. Disable LICM until we have
a chance to fix the underlying issues.
Fixes#275.
* cton-util: fix some clippy unnecessary pass-by-value warnings
* clippy: ignore too many arguments / cyclomatic complexity in module
since these functions are taking args coming from the command line, i
dont think this is actually a valid lint, morally the arguments are all
from one structure
* cton-util: take care of remaining clippy warnings
* cton-reader: fix all non-suspicious clippy warnings
* cton-reader: disable clippy at site of suspicious lint
* cton-frontend: disable clippy at the site of an invalid lint
* cton-frontend: fix clippy warnings, or ignore benign ones
* clippy: ignore the camelcase word WebAssembly in docs
* cton-wasm: fix clippy complaints or ignore benign ones
* cton-wasm tests: fix clippy complaints
* cretonne: starting point turns off all clippy warnings
* cretonne: clippy fixes, or lower allow() to source of problem
* cretonne: more clippy fixes
* cretonne: fix or disable needless_lifetimes lint
this linter is buggy when the declared lifetime is used for another type
constraint.
* cretonne: fix clippy complaint about Pass::NoPass
* rustfmt
* fix prev minor api changes clippy suggested
* add clippy to test-all
* cton-filetests: clippy fixes
* simplify clippy reporting in test-all
* cretonne: document clippy allows better
* cretonne: fix some more clippy lints
* cretonne: fix clippy lints (mostly doc comments)
* cretonne: allow all needless_lifetimes clippy warnings
remove overrides at the false positives
* rustfmt
Merge the `use` parts of the `no_std` branch. This reduces the diffs
between master and the `no_std` branch, making it easier to maintain.
Most of these changes are derived from patches by @lachlansneff in
https://github.com/Cretonne/cretonne/tree/no_std.
This will allow wasm implementations that wish to insert code into
every loop, for example to insert an interrupt check or a safepoint.
do so without relying on asynchronous signals.
There are two cases:
1. It seems that grep on macOS exits as soon as it finds the first match. This makes cargo unhappy and it prints message like "failed printing to stdout: Broken pipe (os error 32)". The solution is to fully consume the output from cargo. I choose to use tee for this task.
2. When in a strict mode, bash complains that $1 is not defined (when it's actually not defined in case of omitting --install). The solution is to apply bash substitution magic: when $1 is undefined or set to null substitute it with empty string.
* Rename `I32` -> `X86_32` and `I64` -> `X86_64`
* Format file to pass flake8 tests
* Fix comment so lines are under 80 char limit
* Remove trailing whitespace from comment
* Renamed `enc_i64` to `enc_x86_64` as per suggestion from PR
In this case, it's a little nicer to just use more assertions,
which will print their line number indicating how far the test
got, when they fail.
And this allows the tests to be run in no_std configurations.
