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| author | Nuno Lopes <nunoplopes@sapo.pt> | 2012-07-16 20:47:16 +0000 |
|---|---|---|
| committer | Nuno Lopes <nunoplopes@sapo.pt> | 2012-07-16 20:47:16 +0000 |
| commit | 7e733eab2f11fceb24d6b4f25c27d7ba7d92d97e (patch) | |
| tree | ab82e7cc0758a49e83f62f6991993c738edcf2a6 /lib/Support/ConstantRange.cpp | |
| parent | 98819c9d1e3b929e9ebab0e8cd3edb31aad21bd8 (diff) | |
| download | llvm-7e733eab2f11fceb24d6b4f25c27d7ba7d92d97e.tar.gz llvm-7e733eab2f11fceb24d6b4f25c27d7ba7d92d97e.tar.bz2 llvm-7e733eab2f11fceb24d6b4f25c27d7ba7d92d97e.tar.xz | |
teach ConstantRange that zero times X is always zero
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160317 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Support/ConstantRange.cpp')
| -rw-r--r-- | lib/Support/ConstantRange.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Support/ConstantRange.cpp b/lib/Support/ConstantRange.cpp index b83dcccca6..221ca948ca 100644 --- a/lib/Support/ConstantRange.cpp +++ b/lib/Support/ConstantRange.cpp @@ -537,6 +537,12 @@ ConstantRange::multiply(const ConstantRange &Other) const { if (isEmptySet() || Other.isEmptySet()) return ConstantRange(getBitWidth(), /*isFullSet=*/false); + + // If any of the operands is zero, then the result is also zero. + if ((getSingleElement() && *getSingleElement() == 0) || + (Other.getSingleElement() && *Other.getSingleElement() == 0)) + return ConstantRange(APInt(getBitWidth(), 0)); + if (isFullSet() || Other.isFullSet()) return ConstantRange(getBitWidth(), /*isFullSet=*/true); |