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GettingOverview
Overview
1
The following pseudo-instructions are generated by nios-elf-gcc (GNU
compiler) and understood by nios-elf-as (GNU assembler).
The following operators are understood by nios-elf-as. These operators
may be used with constants and symbolic addresses, and can be correctly
resolved either by the assembler or the linker.
Table 18. GNU Compiler/Assembler Pseudo-instructions
Psuedo-Instruction Equivalent Instruction Notes
LRET JMP %o7 LRET has no operands
RET JMP %i7 RET has no operands
NOP MOV %g0,%g0 NOP has no operands
IF0 %rA,IMM5 SKP1 %rA,IMM5
IF1 %rA,IMM5 SKP0 %rA,IMM5
IFRz %rA SKPRnz %rA
IFRnz %rA SKPRz %rA
IFS cc_c SKPS cc_nc
IFS cc_nc SKPS cc_c
IFS cc_z SKPS cc_nz
IFS cc_nz SKPS cc_z
IFS cc_mi SKPS cc_pl
IFS cc_pl SKPS cc_mi
IFS ccge SKPS cc_lt
IFS cc_lt SKPS cc_ge
IFS cc_le SKPS cc_gt
IFS cc_gt SKPS cc_le
IFS cc_v SKPS cc_nv
IFS cc_nv SKPS cc_v
IFS cc_ls SKPS cc_hi
IFS cc_hi SKPS cc_ls
Operator Description Operation
%lo(x) Extract low 5 bits of x. x & 0×0000001f
%hi(x) Extract bits 5..15 of x.(x >> 5) & 0×000007ff
%xlo(x) Extract bits 16..20 of x.(x >> 1 (x >> 16) & 0×0000001f
%xhi(x) Extract bits 21..31 of x.(x >> 21) & 0×000007ff
x@h Half-word address of x. x >> 1