Struct cranelift_codegen::settings::Flags
source · pub struct Flags { /* private fields */ }Expand description
Flags group shared.
Implementations§
source§impl Flags
impl Flags
User-defined settings.
sourcepub fn predicate_view(&self) -> PredicateView<'_>
pub fn predicate_view(&self) -> PredicateView<'_>
Get a view of the boolean predicates.
sourcepub fn opt_level(&self) -> OptLevel
pub fn opt_level(&self) -> OptLevel
Optimization level:
- default: Very profitable optimizations enabled, none slow.
- best: Enable all optimizations
- fastest: Optimize for compile time by disabling most optimizations.
sourcepub fn enable_verifier(&self) -> bool
pub fn enable_verifier(&self) -> bool
Run the Cranelift IR verifier at strategic times during compilation.
This makes compilation slower but catches many bugs. The verifier is disabled by default, except when reading Cranelift IR from a text file.
sourcepub fn colocated_libcalls(&self) -> bool
pub fn colocated_libcalls(&self) -> bool
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.
sourcepub fn avoid_div_traps(&self) -> bool
pub fn avoid_div_traps(&self) -> bool
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.
sourcepub fn enable_float(&self) -> bool
pub fn enable_float(&self) -> bool
Enable the use of floating-point instructions
Disabling use of floating-point instructions is not yet implemented.
sourcepub fn enable_nan_canonicalization(&self) -> bool
pub fn enable_nan_canonicalization(&self) -> bool
Enable NaN canonicalization
This replaces NaNs with a single canonical value, for users requiring entirely deterministic WebAssembly computation. This is not required by the WebAssembly spec, so it is not enabled by default.
sourcepub fn enable_simd(&self) -> bool
pub fn enable_simd(&self) -> bool
Enable the use of SIMD instructions.
sourcepub fn enable_atomics(&self) -> bool
pub fn enable_atomics(&self) -> bool
Enable the use of atomic instructions
sourcepub fn baldrdash_prologue_words(&self) -> u8
pub fn baldrdash_prologue_words(&self) -> u8
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 Cranelift-generated code is entered. This includes the pushed return address on x86.
sourcepub fn allones_funcaddrs(&self) -> bool
pub fn allones_funcaddrs(&self) -> bool
Emit not-yet-relocated function addresses as all-ones bit patterns.
sourcepub fn probestack_enabled(&self) -> bool
pub fn probestack_enabled(&self) -> bool
Enable the use of stack probes, for calling conventions which support this functionality.
sourcepub fn probestack_func_adjusts_sp(&self) -> bool
pub fn probestack_func_adjusts_sp(&self) -> bool
Set this to true of the stack probe function modifies the stack pointer itself.
sourcepub fn probestack_size_log2(&self) -> u8
pub fn probestack_size_log2(&self) -> u8
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.
sourcepub fn jump_tables_enabled(&self) -> bool
pub fn jump_tables_enabled(&self) -> bool
Enable the use of jump tables in generated machine code.