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SLPVectorizer: Implement DCE as part of vectorization.

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This is a complete re-write if the bottom-up vectorization class.
Before this commit we scanned the instruction tree 3 times. First in search of merge points for the trees. Second, for estimating the cost. And finally for vectorization.
There was a lot of code duplication and adding the DCE exposed bugs. The new design is simpler and DCE was a part of the design.
In this implementation we build the tree once. After that we estimate the cost by scanning the different entries in the constructed tree (in any order). The vectorization phase also works on the built tree.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185774 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2013-07-07 06:57:07 +00:00
parent 95a1b3484d
commit 369cc938d2
17 changed files with 1695 additions and 1028 deletions
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16
test/Transforms/SLPVectorizer/X86/saxpy.ll
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@@ -43,3 +43,19 @@ define void @SAXPY(i32* noalias nocapture %x, i32* noalias nocapture %y, i32 %a,
ret void
}
; Make sure we don't crash on this one.
define void @SAXPY_crash(i32* noalias nocapture %x, i32* noalias nocapture %y, i64 %i) {
%1 = add i64 %i, 1
%2 = getelementptr inbounds i32* %x, i64 %1
%3 = getelementptr inbounds i32* %y, i64 %1
%4 = load i32* %3, align 4
%5 = add nsw i32 undef, %4
store i32 %5, i32* %2, align 4
%6 = add i64 %i, 2
%7 = getelementptr inbounds i32* %x, i64 %6
%8 = getelementptr inbounds i32* %y, i64 %6
%9 = load i32* %8, align 4
%10 = add nsw i32 undef, %9
store i32 %10, i32* %7, align 4
ret void
}