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SLPVectorizer: Fix invalid iterator errors

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Update iterator when the SLP vectorizer changes the instructions in the basic
block by restarting the traversal of the basic block.

Patch by Yi Jiang!

Fixes PR 16899.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188832 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer
2013-08-20 21:21:45 +00:00
parent 80f495aab0
commit 16a2253e40
2 changed files with 81 additions and 13 deletions
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test/Transforms/SLPVectorizer/X86/pr16899.ll
+30
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; RUN: opt < %s -slp-vectorizer -S -mtriple=i386--netbsd -mcpu=i486
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32-S128"
target triple = "i386--netbsd"
@a = common global i32* null, align 4
; Function Attrs: noreturn nounwind readonly
define i32 @fn1() #0 {
entry:
%0 = load i32** @a, align 4, !tbaa !0
%1 = load i32* %0, align 4, !tbaa !3
%arrayidx1 = getelementptr inbounds i32* %0, i32 1
%2 = load i32* %arrayidx1, align 4, !tbaa !3
br label %do.body
do.body: ; preds = %do.body, %entry
%c.0 = phi i32 [ %2, %entry ], [ %add2, %do.body ]
%b.0 = phi i32 [ %1, %entry ], [ %add, %do.body ]
%add = add nsw i32 %b.0, %c.0
%add2 = add nsw i32 %add, 1
br label %do.body
}
attributes #0 = { noreturn nounwind readonly "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
!0 = metadata !{metadata !"any pointer", metadata !1}
!1 = metadata !{metadata !"omnipotent char", metadata !2}
!2 = metadata !{metadata !"Simple C/C++ TBAA"}
!3 = metadata !{metadata !"int", metadata !1}