llvm-project

Commit Graph

Author	SHA1	Message	Date
David Green	8ceab61c75	[CVP] Require DomTree for new Pass Manager We were previously using a DT in CVP through SimplifyQuery, but not requiring it in the new pass manager. Hence it would crash if DT was not already available. This now gets DT directly and plumbs it through to where it is used (instead of using it through SQ). llvm-svn: 332836	2018-05-21 11:06:28 +00:00
Sanjay Patel	3b6d46761f	[CVP] simplify phi with constant incoming values that match common variable edge values This is based on an example that was recently posted on llvm-dev: void propagate_null(void b, int* g) { if (!b) { return 0; } (*g)++; return b; } https://godbolt.org/g/xYk3qG The original code or constant propagation in other passes has obscured the fact that the phi can be removed completely. Differential Revision: https://reviews.llvm.org/D45448 llvm-svn: 329755	2018-04-10 20:42:39 +00:00

Author

SHA1

Message

Date

David Green

8ceab61c75

[CVP] Require DomTree for new Pass Manager

We were previously using a DT in CVP through SimplifyQuery, but not requiring it in
the new pass manager. Hence it would crash if DT was not already available. This now
gets DT directly and plumbs it through to where it is used (instead of using it
through SQ).

llvm-svn: 332836

2018-05-21 11:06:28 +00:00

Sanjay Patel

3b6d46761f

[CVP] simplify phi with constant incoming values that match common variable edge values

This is based on an example that was recently posted on llvm-dev:

void *propagate_null(void* b, int* g) {
  if (!b) {
    return 0;
  }
  (*g)++;
  return b;
}

https://godbolt.org/g/xYk3qG

The original code or constant propagation in other passes has obscured the fact 
that the phi can be removed completely.

Differential Revision: https://reviews.llvm.org/D45448

llvm-svn: 329755

2018-04-10 20:42:39 +00:00

2 Commits