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| author | Nikita Popov <nikita.ppv@gmail.com> | 2020-05-02 11:47:04 +0200 |
|---|---|---|
| committer | Nikita Popov <nikita.ppv@gmail.com> | 2020-05-02 12:29:26 +0200 |
| commit | 8148b116474614c176d69de8c246fc21494faf5f (patch) | |
| tree | 65af29f7b3d28b0e6e3f9a9dd73bfbd7ae18543b /llvm/lib/Analysis/ValueTracking.cpp | |
| parent | b7e2358220f26ee82e0e958f2d691d2f00341a0a (diff) | |
| download | llvm-8148b116474614c176d69de8c246fc21494faf5f.zip llvm-8148b116474614c176d69de8c246fc21494faf5f.tar.gz llvm-8148b116474614c176d69de8c246fc21494faf5f.tar.bz2 | |
[ValueTracking] Short-circuit GEP known bits calculation (NFC)
Don't compute known bits of all GEP operands, if we already know
that we don't know anything.
Diffstat (limited to 'llvm/lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ValueTracking.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp index 6fbf246..3d1e627 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -1454,6 +1454,10 @@ static void computeKnownBitsFromOperator(const Operator *I, gep_type_iterator GTI = gep_type_begin(I); for (unsigned i = 1, e = I->getNumOperands(); i != e; ++i, ++GTI) { + // TrailZ can only become smaller, short-circuit if we hit zero. + if (TrailZ == 0) + break; + Value *Index = I->getOperand(i); if (StructType *STy = GTI.getStructTypeOrNull()) { // Handle struct member offset arithmetic. |