maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
148,682 Commits 23 Branches 0 Tags 2.2 GiB
Commit Graph

4 Commits

Author SHA1 Message Date
Nadav Rotem d5f5777b77 It is illegal to transform (sdiv (ashr X c1) c2) -> (sdiv x (2^c1 * c2)), 
because C always rounds towards zero.

Thanks Dirk and Ben.

llvm-svn: 162899
 2012-08-30 11:23:20 +00:00
Benjamin Kramer 9c0a807c27 InstCombine: Guard the transform introduced in r162743 against large ints and non-const shifts. 
llvm-svn: 162751
 2012-08-28 13:08:13 +00:00
Nadav Rotem d457787fed Make sure that we don't call getZExtValue on values > 64 bits. 
Thanks Benjamin for noticing this.

llvm-svn: 162749
 2012-08-28 12:23:22 +00:00
Nadav Rotem 11935b29f3 Teach InstCombine to canonicalize [SU]div+[AL]shl patterns. 
For example:
  %1 = lshr i32 %x, 2
  %2 = udiv i32 %1, 100

rdar://12182093

llvm-svn: 162743
 2012-08-28 10:01:43 +00:00