diff options
| author | Michael Gottesman <mgottesman@apple.com> | 2012-10-16 21:29:38 +0000 |
|---|---|---|
| committer | Michael Gottesman <mgottesman@apple.com> | 2012-10-16 21:29:38 +0000 |
| commit | 4932bbe20c4b96552dcab332503b80ff3b56ad93 (patch) | |
| tree | 5d2163768b2ebc25a96b2c79c0eba202aa69191d /lib/CodeGen | |
| parent | c5ac87d067861309fb461b9c53f9e429fbe0d067 (diff) | |
| download | llvm-4932bbe20c4b96552dcab332503b80ff3b56ad93.tar.gz llvm-4932bbe20c4b96552dcab332503b80ff3b56ad93.tar.bz2 llvm-4932bbe20c4b96552dcab332503b80ff3b56ad93.tar.xz | |
[InstCombine] Teach InstCombine how to handle an obfuscated splat.
An obfuscated splat is where the frontend poorly generates code for a splat
using several different shuffles to create the splat, i.e.,
%A = load <4 x float>* %in_ptr, align 16
%B = shufflevector <4 x float> %A, <4 x float> undef, <4 x i32> <i32 0, i32 0, i32 undef, i32 undef>
%C = shufflevector <4 x float> %B, <4 x float> %A, <4 x i32> <i32 0, i32 1, i32 4, i32 undef>
%D = shufflevector <4 x float> %C, <4 x float> %A, <4 x i32> <i32 0, i32 1, i32 2, i32 4>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166061 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
0 files changed, 0 insertions, 0 deletions