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6 Commits

Author SHA1 Message Date
Vedant Kumar 7fc591f8bb [AggressiveInstCombine] Use use_empty() instead of !getNumUses(), NFC 
use_empty() runs in O(1), whereas getNumUses() runs in O(# uses).

llvm-svn: 326635
 2018-03-02 23:22:49 +00:00
Amjad Aboud b86b771c02 [AggressiveInstCombine] Fixed TruncCombine class to handle TruncInst leaf node correctly. 
This covers the case where TruncInst leaf node is a constant expression.
See PR36121 for more details.

Differential Revision: https://reviews.llvm.org/D42622

llvm-svn: 323926
 2018-01-31 22:39:05 +00:00
Amjad Aboud d895bff5f2 [AggressiveInstCombine] Make TruncCombine class ignore unreachable basic blocks. 
Because dead code may contain non-standard IR that causes infinite looping or crashes in underlying analysis.
See PR36134 for more details.

Differential Revision: https://reviews.llvm.org/D42683

llvm-svn: 323862
 2018-01-31 10:41:31 +00:00
Amjad Aboud f1f57a3137 Another try to commit 323321 (aggressive instruction combine). 
llvm-svn: 323416
 2018-01-25 12:06:32 +00:00
Amjad Aboud d53504e379 Reverted 323321. 
llvm-svn: 323326
 2018-01-24 14:48:49 +00:00
Amjad Aboud e4453233d7 [InstCombine] Introducing Aggressive Instruction Combine pass (-aggressive-instcombine). 
Combine expression patterns to form expressions with fewer, simple instructions.
This pass does not modify the CFG.

For example, this pass reduce width of expressions post-dominated by TruncInst
into smaller width when applicable.

It differs from instcombine pass in that it contains pattern optimization that
requires higher complexity than the O(1), thus, it should run fewer times than
instcombine pass.

Differential Revision: https://reviews.llvm.org/D38313

llvm-svn: 323321
 2018-01-24 12:42:42 +00:00