|Red Hat Enterprise Linux 3: Using as, the Gnu Assembler|
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The macro syntax used on the AMD 29K is like that described in the AMD 29K Family Macro Assembler Specification. Normal as macros should still work.
; is the line comment character.
The character ? is permitted in identifiers (but may not begin an identifier).
General-purpose registers are represented by predefined symbols of the form GRnnn (for global registers) or LRnnn (for local registers), where nnn represents a number between 0 and 127, written with no leading zeros. The leading letters may be in either upper or lower case; for example, gr13 and LR7 are both valid register names.
You may also refer to general-purpose registers by specifying the register number as the result of an expression (prefixed with %% to flag the expression as a register number):
--where expression must be an absolute expression evaluating to a number between 0 and 255. The range [0, 127] refers to global registers, and the range [128, 255] to local registers.
In addition, as understands the following protected special-purpose register names for the AMD 29K family:
vab chd pc0 ops chc pc1 cps rbp pc2 cfg tmc mmu cha tmr lru
These unprotected special-purpose register names are also recognized:
ipc alu fpe ipa bp inte ipb fc fps q cr exop