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5 Commits

Author SHA1 Message Date
Sanjoy Das b771845461 [ImplicitNullChecks] Be smarter in picking the memory op. 
Summary:
Before this change ImplicitNullChecks would only pick loads of the form:

```
   test Reg, Reg
   jz elsewhere
 fallthrough:
   movl 32(Reg), Reg2
```

but not (say)

```
   test Reg, Reg
   jz elsewhere
 fallthrough:
   inc Reg3
   movl 32(Reg), Reg2
```

This change teaches ImplicitNullChecks to look through "unrelated"
instructions like `inc Reg3` when searching for a load instruction
to convert to a trapping load.

Reviewers: atrick, JosephTremoulet, reames

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11044

llvm-svn: 241850
 2015-07-09 20:13:25 +00:00
Sanjoy Das 9c41a93e24 [FaultMaps] Let the frontend pre-select implicit null check candidates. 
Summary:
This change introduces a !make.implicit metadata that allows the
frontend to pre-select the set of explicit null checks that will be
considered for transformation into implicit null checks.

The reason for not using profiling data instead of !make.implicit is
explained in the change to `FaultMaps.rst`.

Reviewers: atrick, reames, pgavlin, JosephTremoulet

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10824

llvm-svn: 241116
 2015-06-30 21:22:32 +00:00
Sanjoy Das 1a66ff70ed [FaultMaps] Fix test case. 
implicit-null-check-negative.ll had a missing 2>&1.  Fix this, and
remove an incorrect test case that this exposes.

llvm-svn: 240998
 2015-06-29 21:27:36 +00:00
Sanjoy Das 784582f116 Add "REQUIRES: asserts" to test case that uses -debug-only 
llvm-svn: 239748
 2015-06-15 20:05:38 +00:00
Sanjoy Das 69fad0799e [CodeGen] Add a pass to fold null checks into nearby memory operations. 
Summary:
This change adds an "ImplicitNullChecks" target dependent pass.  This
pass folds null checks into memory operation using the FAULTING_LOAD
pseudo-op introduced in previous patches.

Depends on D10197
Depends on D10199
Depends on D10200

Reviewers: reames, rnk, pgavlin, JosephTremoulet, atrick

Reviewed By: atrick

Subscribers: ab, JosephTremoulet, llvm-commits

Differential Revision: http://reviews.llvm.org/D10201

llvm-svn: 239743
 2015-06-15 18:44:27 +00:00