Struct cretonne_codegen::settings::Flags
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pub struct Flags { /* fields omitted */ }
Flags group shared
.
Methods
impl Flags
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impl Flags
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User-defined settings.
pub fn predicate_view(&self) -> PredicateView
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Get a view of the boolean predicates.
pub fn opt_level(&self) -> OptLevel
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Optimization level:
- default: Very profitable optimizations enabled, none slow.
- best: Enable all optimizations
- fastest: Optimize for compile time by disabling most optimizations.
pub fn enable_verifier(&self) -> bool
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Run the Cretonne IR verifier at strategic times during compilation.
This makes compilation slower but catches many bugs. The verifier is disabled by default, except when reading Cretonne IR from a text file.
pub fn is_64bit(&self) -> bool
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Enable 64-bit code generation
pub fn call_conv(&self) -> CallConv
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Default calling convention:
- fast: not-ABI-stable convention for best performance
- cold: not-ABI-stable convention for infrequently executed code
- system_v: System V-style convention used on many platforms
- fastcall: Windows "fastcall" convention, also used for x64 and ARM
- baldrdash: SpiderMonkey WebAssembly convention
- probestack: specialized convention for the probestack function
The default calling convention may be overridden by individual functions.
pub fn is_pic(&self) -> bool
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Enable Position-Independent Code generation
pub fn colocated_libcalls(&self) -> bool
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Use colocated libcalls.
Generate code that assumes that libcalls can be declared "colocated", meaning they will be defined along with the current function, such that they can use more efficient addressing.
pub fn return_at_end(&self) -> bool
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Generate functions with at most a single return instruction at the end of the function.
This guarantees that functions do not have any internal return instructions. Either they never return, or they have a single return instruction at the end.
pub fn avoid_div_traps(&self) -> bool
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Generate explicit checks around native division instructions to avoid their trapping.
This is primarily used by SpiderMonkey which doesn't install a signal handler for SIGFPE, but expects a SIGILL trap for division by zero.
On ISAs like ARM where the native division instructions don't trap, this setting has no effect - explicit checks are always inserted.
pub fn is_compressed(&self) -> bool
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Enable compressed instructions
pub fn enable_float(&self) -> bool
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Enable the use of floating-point instructions
Disabling use of floating-point instructions is not yet implemented.
pub fn enable_simd(&self) -> bool
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Enable the use of SIMD instructions.
pub fn enable_atomics(&self) -> bool
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Enable the use of atomic instructions
pub fn baldrdash_prologue_words(&self) -> u8
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Number of pointer-sized words pushed by the baldrdash prologue.
Functions with the baldrdash
calling convention don't generate their
own prologue and epilogue. They depend on externally generated code
that pushes a fixed number of words in the prologue and restores them
in the epilogue.
This setting configures the number of pointer-sized words pushed on the stack when the Cretonne-generated code is entered. This includes the pushed return address on x86.
pub fn allones_funcaddrs(&self) -> bool
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Emit not-yet-relocated function addresses as all-ones bit patterns.
pub fn probestack_enabled(&self) -> bool
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Enable the use of stack probes, for calling conventions which support this functionality.
pub fn probestack_func_adjusts_sp(&self) -> bool
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Set this to true of the stack probe function modifies the stack pointer itself.
pub fn probestack_size_log2(&self) -> u8
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The log2 of the size of the stack guard region.
Stack frames larger than this size will have stack overflow checked by calling the probestack function.
The default is 12, which translates to a size of 4096.
Trait Implementations
impl Clone for Flags
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fn clone(&self) -> Flags
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Display for Flags
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fn fmt(&self, f: &mut Formatter) -> Result
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Formats the value using the given formatter. Read more
impl<'a> From<&'a Flags> for FlagsOrIsa<'a>
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fn from(flags: &'a Flags) -> FlagsOrIsa
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Performs the conversion.