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| author | Andrea Di Biagio <Andrea_DiBiagio@sn.scee.net> | 2013-12-27 20:20:28 +0000 |
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| committer | Andrea Di Biagio <Andrea_DiBiagio@sn.scee.net> | 2013-12-27 20:20:28 +0000 |
| commit | 46dcddb350606ffb44eb2affd9c7c80f253044aa (patch) | |
| tree | aabc8fbea7f1fccc24c3ae1862414e26d2a2118f /clang/lib/Frontend/CompilerInvocation.cpp | |
| parent | ba2f146c87414a3acd10767f43f7e150fab37c10 (diff) | |
| download | llvm-46dcddb350606ffb44eb2affd9c7c80f253044aa.zip llvm-46dcddb350606ffb44eb2affd9c7c80f253044aa.tar.gz llvm-46dcddb350606ffb44eb2affd9c7c80f253044aa.tar.bz2 | |
Teach DAGCombiner how to fold a SIGN_EXTEND_INREG of a BUILD_VECTOR of
ConstantSDNodes (or UNDEFs) into a simple BUILD_VECTOR.
For example, given the following sequence of dag nodes:
i32 C = Constant<1>
v4i32 V = BUILD_VECTOR C, C, C, C
v4i32 Result = SIGN_EXTEND_INREG V, ValueType:v4i1
The SIGN_EXTEND_INREG node can be folded into a build_vector since
the vector in input is a BUILD_VECTOR of constants.
The optimized sequence is:
i32 C = Constant<-1>
v4i32 Result = BUILD_VECTOR C, C, C, C
llvm-svn: 198084
Diffstat (limited to 'clang/lib/Frontend/CompilerInvocation.cpp')
0 files changed, 0 insertions, 0 deletions