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| author | David Majnemer <david.majnemer@gmail.com> | 2016-01-27 02:43:28 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2016-01-27 02:43:28 +0000 |
| commit | c761afd1d1db72fc7986f76f23fed1dd8a1a3ad7 (patch) | |
| tree | 4f6f461338dc85b672c9bdb8b320d649595d35c3 /llvm/lib/Transforms/Vectorize/Vectorize.cpp | |
| parent | 47de2140f7b2e094a03b3ab40c9ab3f4cc911677 (diff) | |
| download | bcm5719-llvm-c761afd1d1db72fc7986f76f23fed1dd8a1a3ad7.tar.gz bcm5719-llvm-c761afd1d1db72fc7986f76f23fed1dd8a1a3ad7.zip | |
[SimplifyCFG] Don't mistake icmp of and for a tree of comparisons
SimplifyCFG tries to turn complex branch conditions into a switch.
Some of it's logic attempts to reason about bitwise arithmetic produced
by InstCombine. InstCombine can turn things like (X == 2) || (X == 3)
into (X & 1) == 2 and so SimplifyCFG tries to detect when this occurs so
that it can produce a switch instruction.
However, the legality checking was not sufficient to determine whether
or not this had occured. Correctly check this case by requiring that
the right-hand side of the comparison be a power of two.
This fixes PR26323.
llvm-svn: 258904
Diffstat (limited to 'llvm/lib/Transforms/Vectorize/Vectorize.cpp')
0 files changed, 0 insertions, 0 deletions
