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Two slightly different syntaxes are support for ARM and THUMB instructions. The default, divided
, uses the old style where ARM and THUMB instructions had their own, separate syntaxes. The new, unified
syntax, which can be selected via the .syntax
directive, and has the following main features:
#
prefix.IT
instruction may appear, and if it does it is validated against subsequent conditional affixes. In ARM mode it does not generate machine code, in THUMB mode it does.IT
instruction.divided
syntax)..N
and .W
suffixes are recognized and honored.s
affix.