Pragmas for Optimization

Pragmas for Optimization should be placed outside the functions to which it is desired that they be applied.

This chapter explains the following pragmas:

• global_optimizer
  Controls whether the Frontend IR Optimizer is invoked by the compiler.
• ipa
  Specifies how to apply interprocedural analysis optimizations.
• ipa_inline_max_auto_size
  Determines the maximum complexity for an auto-inlined function.
• ipa_not_complete
  Controls the usage of Complete Program IPA mode by the compiler.
• load_store_elimination
  Controls the use of load store elimination optimization.
• opt_common_subs
  Controls the use of common subexpression optimization.
• opt_dead_assignments
  Controls the use of dead store optimization.
• opt_dead_code
  Controls the use of dead code optimization.
• opt_lifetimes
  Controls the use of lifetime analysis optimization.
• opt_loop_invariants
  Controls the use of loop invariant optimization.
• opt_propagation
  Controls the use of copy and constant propagation optimization.
• opt_strength_reduction
  Controls the use of strength reduction optimization.
• opt_strength_reduction_strict
  Uses a safer variation of strength reduction optimization.
• opt_unroll_loops
  Controls the use of loop unrolling optimization.
• opt_vectorize_loops
  Controls the use of loop vectorizing optimization.
• optimization_level
  Controls global optimization.
• optimize_for_size
  Controls optimization to reduce the size of object code.
• optimizewithasm
  Controls optimization of assembly language.
• pack
  Stores data to reduce data size instead of improving execution performance.
• strictheaderchecking
  Controls how strict the compiler checks headers for standard C library functions.