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| author | Jingyue Wu <jingyue@google.com> | 2014-06-08 20:19:38 +0000 |
|---|---|---|
| committer | Jingyue Wu <jingyue@google.com> | 2014-06-08 20:19:38 +0000 |
| commit | d8fdbb2ea84afd9be849e4237634ec09879a2d36 (patch) | |
| tree | 5cac085f5fa7cb843727b2ce1444df0b08fce9e7 /unittests/IR/TypeBuilderTest.cpp | |
| parent | b9422f1d77eaf6d3410ea07da2e07d8b81ef4f28 (diff) | |
| download | llvm-d8fdbb2ea84afd9be849e4237634ec09879a2d36.tar.gz llvm-d8fdbb2ea84afd9be849e4237634ec09879a2d36.tar.bz2 llvm-d8fdbb2ea84afd9be849e4237634ec09879a2d36.tar.xz | |
[SeparateConstOffsetFromGEP] Fix an illegitimate optimization on zext
zext(a + b) != zext(a) + zext(b) even if a + b >= 0 && b >= 0.
e.g., a = i4 0b1111, b = i4 0b0001
zext a + b to i8 = zext 0b0000 to i8 = 0b00000000
(zext a to i8) + (zext b to i8) = 0b00001111 + 0b00000001 = 0b00010000
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210439 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'unittests/IR/TypeBuilderTest.cpp')
0 files changed, 0 insertions, 0 deletions