On 6-Apr-13, at 12:25 PM, Steven Bosscher wrote:
Are there any reasons against removing !TARGET_BIG_SWITCH support? It
would really help if this code can go away...
Yes, branch distances are limited to what can be encoded in a 17-bit
pc relative
offset. Large code will break with !TARGET_BIG_SWITCH.
I think the answer is to move the jump table from the text to read-
only data. This
would require another instruction or two to load the label for the
table. The HP
compiler does this. Although this is unclear, I suspect there are
situations where
what we do now can cause TLB thrash. This occurs on machines with
shared
instruction and data TLBs. Would this help?
Dave
--
John David Anglin dave.ang...@bell.net
