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4 Commits

Author SHA1 Message Date
Sanjay Patel 4158eff0f8 [InstSimplify] fold implied null ptr check (PR35790) 
This extends rL322327 to handle the pointer cast and should solve:
https://bugs.llvm.org/show_bug.cgi?id=35790

Name: or_eq_zero
  %isnull = icmp eq i64* %p, null
  %x = ptrtoint i64* %p to i64
  %somebits = and i64 %x, %y
  %somebits_are_zero = icmp eq i64 %somebits, 0
  %or = or i1 %somebits_are_zero, %isnull
  =>
  %or = %somebits_are_zero

Name: and_ne_zero
  %isnotnull = icmp ne i64* %p, null
  %x = ptrtoint i64* %p to i64
  %somebits = and i64 %x, %y
  %somebits_are_not_zero = icmp ne i64 %somebits, 0
  %and = and i1 %somebits_are_not_zero, %isnotnull
  =>
  %and = %somebits_are_not_zero

https://rise4fun.com/Alive/CQ3

llvm-svn: 322439
 2018-01-13 15:44:44 +00:00
Sanjay Patel 6691e40980 [InstSimplify] add tests for implied ptr cmp with null (PR35790); NFC 
llvm-svn: 322411
 2018-01-12 22:16:26 +00:00
Sanjay Patel 6ef6aa987c [InstSimplify] fold implied cmp with zero (PR35790) 
This doesn't handle the more complicated case in the bug report yet:
https://bugs.llvm.org/show_bug.cgi?id=35790

For that, we have to match / look through a cast.

llvm-svn: 322327
 2018-01-11 23:27:37 +00:00
Sanjay Patel ac0edcb3f3 [InstSimplify] add tests for implied cmp with zero (PR35790); NFC 
llvm-svn: 322323
 2018-01-11 22:48:07 +00:00