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| author | Bill Wendling <isanbard@gmail.com> | 2008-11-30 05:01:05 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2008-11-30 05:01:05 +0000 |
| commit | f0e44c4d7afeb91f309ff277de83e3d9ce27e37f (patch) | |
| tree | d0701269fd0842f8d8836012164ab7b7fb8a05f2 /lib/CodeGen/SelectionDAG/TargetLowering.cpp | |
| parent | 86f874d9bb3722e81381e832eb4c867f562e308c (diff) | |
From Hacker's Delight:
"For signed integers, the determination of overflow of x*y is not so simple. If
x and y have the same sign, then overflow occurs iff xy > 2**31 - 1. If they
have opposite signs, then overflow occurs iff xy < -2**31."
In this case, x == -1.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60278 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/TargetLowering.cpp')
0 files changed, 0 insertions, 0 deletions