Paul Brook paul@codesourcery.com
Tue Jul 25 14:07:00 GMT 2006

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> Note that you can always do a jump table using a PC relative
> relocation against a single symbol, plus an addend.

Not always. You may want to put the table itself in .rodata (to reduce code 
size for better constant pool placement), and have the values in the table be 
relative to the branch instruction. Especially with hot/cold partitioning 
there's no guarantee that both the jump and the target will be in the same 
section. eg:

.section rodata
table:
  .word label1 - label2

.section text.hot
label2:
  branch (pc + load(table + reg))

.section text.cold
label1:
  code

Paul

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