llvm-6502/test/Transforms/LoopSimplify/preserve-scev.ll
Dan Gohman ffa75cdcf8 Fix LoopSimplify to notify ScalarEvolution when splitting a loop backedge
into an inner loop, as the new loop iteration may differ substantially.
This fixes PR8078.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113057 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-04 02:42:48 +00:00

51 lines
1.7 KiB
LLVM

; RUN: opt -S < %s -indvars | opt -analyze -iv-users | grep {%cmp = icmp slt i32} | grep {= \{%\\.ph,+,1\}<%for.cond>}
; PR8079
; LoopSimplify should invalidate indvars when splitting out the
; inner loop.
@maxStat = external global i32
define i32 @test() nounwind {
entry:
br label %for.cond
for.cond: ; preds = %if.then5, %if.end, %entry
%cuts.1 = phi i32 [ 0, %entry ], [ %inc, %if.then5 ], [ %cuts.1, %if.end ]
%0 = phi i32 [ 0, %entry ], [ %add, %if.end ], [ %add, %if.then5 ]
%add = add i32 %0, 1
%cmp = icmp slt i32 %0, 1
%tmp1 = load i32* @maxStat, align 4
br i1 %cmp, label %for.body, label %for.cond14.preheader
for.cond14.preheader: ; preds = %for.cond
%cmp1726 = icmp sgt i32 %tmp1, 0
br i1 %cmp1726, label %for.body18, label %return
for.body: ; preds = %for.cond
%cmp2 = icmp sgt i32 %tmp1, 100
br i1 %cmp2, label %return, label %if.end
if.end: ; preds = %for.body
%cmp4 = icmp sgt i32 %tmp1, -1
br i1 %cmp4, label %if.then5, label %for.cond
if.then5: ; preds = %if.end
call void @foo() nounwind
%inc = add i32 %cuts.1, 1
br label %for.cond
for.body18: ; preds = %for.body18, %for.cond14.preheader
%i13.027 = phi i32 [ %1, %for.body18 ], [ 0, %for.cond14.preheader ]
call void @foo() nounwind
%1 = add nsw i32 %i13.027, 1
%tmp16 = load i32* @maxStat, align 4
%cmp17 = icmp slt i32 %1, %tmp16
br i1 %cmp17, label %for.body18, label %return
return: ; preds = %for.body18, %for.body, %for.cond14.preheader
ret i32 0
}
declare void @foo() nounwind