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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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23
test/Transforms/SLPVectorizer/X86/crash_lencod2.ll Normal file
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; RUN: opt < %s -basicaa -slp-vectorizer -dce -S -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"
; Function Attrs: nounwind ssp uwtable
define void @intrapred_luma() #0 {
entry:
%conv153 = trunc i32 undef to i16
%arrayidx154 = getelementptr inbounds [13 x i16]* undef, i64 0, i64 12
store i16 %conv153, i16* %arrayidx154, align 8, !tbaa !0
%arrayidx155 = getelementptr inbounds [13 x i16]* undef, i64 0, i64 11
store i16 %conv153, i16* %arrayidx155, align 2, !tbaa !0
%arrayidx156 = getelementptr inbounds [13 x i16]* undef, i64 0, i64 10
store i16 %conv153, i16* %arrayidx156, align 4, !tbaa !0
ret void
}
attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
!0 = metadata !{metadata !"short", metadata !1}
!1 = metadata !{metadata !"omnipotent char", metadata !2}
!2 = metadata !{metadata !"Simple C/C++ TBAA"}