Josh Soref
730b16c569
Spelling siloptimizer
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Signed-off-by: Josh Soref <jsoref@users.noreply.github.com >
2022-10-03 18:31:33 -04:00
Andrew Trick
522dc9d32e
InstructionDeleter - delete dead alloc_stack
2022-02-16 12:23:01 -08:00
Andrew Trick
17e13d4ed8
InstructionDeleter - ignore already-deleted instructions
...
Handle uses of deleted instructions in which multiple operands become
dead in the same invocation.
2022-02-15 13:28:47 -08:00
Andrew Trick
962c290ea6
Rename InstructionDeleter disallowDebugUses to preserveDebugInfo
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CanonicalizeInstruction will be migrated to the InstructionDeleter, so
make sure we use consistent names.
2021-12-15 11:02:11 -08:00
Andrew Trick
f512bebf07
Add isReadOnlyConstantEvaluableCall to handle stdlib asserts
...
Fix isScopeAffectingInstructionDead to use this new API. A stdlib
assert, which has "program_termination" semantics, should not be
considered read-only.
isReadOnlyConstantEvaluableCall API:
/// Return true iff the \p applySite is constant-evaluable and read-only.
///
/// Functions annotated as "constant_evaluable" are assumed to be "side-effect
/// free", unless their signature and substitution map indicates otherwise. A
/// constant_evaluable function call is read only unless it:
/// (1) has generic parameters
/// (2) has inout parameters
/// (3) has indirect results
///
/// Read-only constant evaluable functions can do only the following and
/// nothing else:
/// (1) The call may read any memory location.
/// (2) The call may destroy owned parameters i.e., consume them.
/// (3) The call may write into memory locations newly created by the call.
/// (4) The call may use assertions, which traps at runtime on failure.
/// (5) The call may return a non-generic value.
///
/// Essentially, these are calls whose "effect" is visible only in their return
/// value or through the parameters that are destroyed. The return value
/// is also guaranteed to have value semantics as it is non-generic and
/// reference semantics is not constant evaluable.
2021-11-18 18:38:49 -08:00
Andrew Trick
b517cce16f
Move InstructionDeleter into its own header.
...
Add file-level comments on the utility's purpose and intended API
usage.
Cleanup API comments.
2021-11-18 11:38:08 -08:00
