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authorLinus Torvalds <torvalds@linux-foundation.org>2011-05-22 14:30:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-22 14:30:36 -0700
commit281dc5c5ec0fb299514567cbc358562649c1af95 (patch)
tree2ecb019795e99147ce8d90b5e97c2bc3051f7855 /drivers/scsi/3w-sas.h
parentMerge branch 'viafb-next' of git://github.com/schandinat/linux-2.6 (diff)
downloadlinux-dev-281dc5c5ec0fb299514567cbc358562649c1af95.tar.xz
linux-dev-281dc5c5ec0fb299514567cbc358562649c1af95.zip
Give up on pushing CC_OPTIMIZE_FOR_SIZE
I still happen to believe that I$ miss costs are a major thing, but sadly, -Os doesn't seem to be the solution. With or without it, gcc will miss some obvious code size improvements, and with it enabled gcc will sometimes make choices that aren't good even with high I$ miss ratios. For example, with -Os, gcc on x86 will turn a 20-byte constant memcpy into a "rep movsl". While I sincerely hope that x86 CPU's will some day do a good job at that, they certainly don't do it yet, and the cost is higher than a L1 I$ miss would be. Some day I hope we can re-enable this. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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