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3 Commits

Author SHA1 Message Date
Jiangning Liu b2ae37fb67 Global merge for global symbols. 
This commit is to improve global merge pass and support global symbol merge.
The global symbol merge is not enabled by default. For aarch64, we need some
more back-end fix to make it really benifit ADRP CSE.

llvm-svn: 210640
 2014-06-11 06:44:53 +00:00
Rafael Espindola 5a52b9f139 Revert "Implement global merge optimization for global variables." 
This reverts commit r208934.

The patch depends on aliases to GEPs with non zero offsets. That is not
supported and fairly broken.

The good news is that GlobalAlias is being redesigned and will have support
for offsets, so this patch should be a nice match for it.

llvm-svn: 208978
 2014-05-16 13:02:18 +00:00
Jiangning Liu 932e1c3924 Implement global merge optimization for global variables. 
This commit implements two command line switches -global-merge-on-external
and -global-merge-aligned, and both of them are false by default, so this
optimization is disabled by default for all targets.

For ARM64, some back-end behaviors need to be tuned to get this optimization
further enabled.

llvm-svn: 208934
 2014-05-15 23:45:42 +00:00