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| author | Nick Lewycky <nicholas@mxc.ca> | 2014-05-20 01:23:40 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2014-05-20 01:23:40 +0000 |
| commit | fe47ebfad39184dfca0733c5ef943a074bfcc187 (patch) | |
| tree | 2f60176fb1f04022ea8a167ff280bc824f18f11a /lib/Analysis | |
| parent | 30e58303015fe880180e3caffdd8a3264cde236a (diff) | |
| download | llvm-fe47ebfad39184dfca0733c5ef943a074bfcc187.tar.gz llvm-fe47ebfad39184dfca0733c5ef943a074bfcc187.tar.bz2 llvm-fe47ebfad39184dfca0733c5ef943a074bfcc187.tar.xz | |
Add 'nonnull', a new parameter and return attribute which indicates that the pointer is not null. Instcombine will elide comparisons between these and null. Patch by Luqman Aden!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209185 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis')
| -rw-r--r-- | lib/Analysis/ValueTracking.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp index 44305bb016..280f15b509 100644 --- a/lib/Analysis/ValueTracking.cpp +++ b/lib/Analysis/ValueTracking.cpp @@ -2065,9 +2065,9 @@ bool llvm::isKnownNonNull(const Value *V, const TargetLibraryInfo *TLI) { // Alloca never returns null, malloc might. if (isa<AllocaInst>(V)) return true; - // A byval or inalloca argument is never null. + // A byval, inalloca, or nonnull argument is never null. if (const Argument *A = dyn_cast<Argument>(V)) - return A->hasByValOrInAllocaAttr(); + return A->hasByValOrInAllocaAttr() || A->hasNonNullAttr(); // Global values are not null unless extern weak. if (const GlobalValue *GV = dyn_cast<GlobalValue>(V)) |