(as.info.gz) Xtensa Directives

 
 9.40.5 Directives
 -----------------
 
 The Xtensa assembler supports a region-based directive syntax:
 
          .begin DIRECTIVE [OPTIONS]
          ...
          .end DIRECTIVE
 
    All the Xtensa-specific directives that apply to a region of code use
 this syntax.
 
    The directive applies to code between the `.begin' and the `.end'.
 The state of the option after the `.end' reverts to what it was before
 the `.begin'.  A nested `.begin'/`.end' region can further change the
 state of the directive without having to be aware of its outer state.
 For example, consider:
 
          .begin no-transform
      L:  add a0, a1, a2
          .begin transform
      M:  add a0, a1, a2
          .end transform
      N:  add a0, a1, a2
          .end no-transform
 
    The `ADD' opcodes at `L' and `N' in the outer `no-transform' region
 both result in `ADD' machine instructions, but the assembler selects an
 `ADD.N' instruction for the `ADD' at `M' in the inner `transform'
 region.
 
    The advantage of this style is that it works well inside macros
 which can preserve the context of their callers.
 
    The following directives are available:

 
* Schedule Directive         Enable instruction scheduling.
* Longcalls Directive        Use Indirect Calls for Greater Range.
* Transform Directive        Disable All Assembler Transformations.
* Literal Directive          Intermix Literals with Instructions.
* Literal Position Directive Specify Inline Literal Pool Locations.
* Literal Prefix Directive   Specify Literal Section Name Prefix.
* Absolute Literals Directive Control PC-Relative vs. Absolute Literals.

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