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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 | 986cc181b0ac566e4de37da82b0ea66451ec0b7c (patch) | |
| tree | 82bd96f900eb84470dbe61f9e12b293aef0f4758 /llvm/lib/Support | |
| parent | 784933b791626f16422ac8cf234a127bf6981406 (diff) | |
| download | bcm5719-llvm-986cc181b0ac566e4de37da82b0ea66451ec0b7c.tar.gz bcm5719-llvm-986cc181b0ac566e4de37da82b0ea66451ec0b7c.zip | |
teach ConstantRange that zero times X is always zero
llvm-svn: 160317
Diffstat (limited to 'llvm/lib/Support')
| -rw-r--r-- | llvm/lib/Support/ConstantRange.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Support/ConstantRange.cpp b/llvm/lib/Support/ConstantRange.cpp index b83dcccca67..221ca948ca5 100644 --- a/llvm/lib/Support/ConstantRange.cpp +++ b/llvm/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); |
