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llvm-6502/test/Transforms/LoopStrengthReduce/2012-03-15-nopreheader.ll
Andrew Trick a3b10b8359 LSR: teach isSimplifiedLoopNest to handle PHI IVUsers. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153132 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-20 21:24:44 +00:00

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; RUN: opt -loop-reduce -S < %s | FileCheck %s
;
; <rdar://problem/11049788> Segmentation fault: 11 in LoopStrengthReduce
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"
target triple = "x86_64-apple-darwin10.0.0"
; IVUsers should not consider tmp128 a valid user because it is not in a
; simplified loop nest.
; CHECK: @nopreheader
; CHECK: for.cond:
; CHECK: %tmp128 = add i64 %0, %indvar65
define void @nopreheader(i8* %cmd) nounwind ssp {
entry:
indirectbr i8* undef, [label %while.cond]
while.cond: ; preds = %while.body, %entry
%0 = phi i64 [ %indvar.next48, %while.body ], [ 0, %entry ]
indirectbr i8* undef, [label %while.end, label %while.body]
while.body: ; preds = %lor.rhs, %lor.lhs.false17, %lor.lhs.false11, %lor.lhs.false, %land.rhs
%indvar.next48 = add i64 %0, 1
indirectbr i8* undef, [label %while.cond]
while.end: ; preds = %lor.rhs, %while.cond
indirectbr i8* undef, [label %if.end152]
if.end152: ; preds = %lor.lhs.false144, %if.end110
indirectbr i8* undef, [label %lor.lhs.false184, label %for.cond]
lor.lhs.false184: ; preds = %lor.lhs.false177
indirectbr i8* undef, [label %return, label %for.cond]
for.cond: ; preds = %for.inc, %lor.lhs.false184, %if.end152
%indvar65 = phi i64 [ %indvar.next66, %for.inc ], [ 0, %lor.lhs.false184 ], [ 0, %if.end152 ]
%tmp128 = add i64 %0, %indvar65
%s.4 = getelementptr i8* %cmd, i64 %tmp128
%tmp195 = load i8* %s.4, align 1
indirectbr i8* undef, [label %return, label %land.rhs198]
land.rhs198: ; preds = %for.cond
indirectbr i8* undef, [label %return, label %for.inc]
for.inc: ; preds = %lor.rhs234, %land.lhs.true228, %land.lhs.true216, %land.lhs.true204
%indvar.next66 = add i64 %indvar65, 1
indirectbr i8* undef, [label %for.cond]
return: ; preds = %if.end677, %doshell, %if.then96
ret void
}
; Another case with a dominating loop that does not contain the IV
; User. Just make sure it doesn't assert.
define void @nopreheader2() nounwind ssp {
entry:
indirectbr i8* undef, [label %while.cond, label %return]
while.cond: ; preds = %while.cond.backedge, %entry
indirectbr i8* undef, [label %while.cond.backedge, label %lor.rhs]
lor.rhs: ; preds = %while.cond
indirectbr i8* undef, [label %while.cond.backedge, label %while.end]
while.cond.backedge: ; preds = %lor.rhs, %while.cond
indirectbr i8* undef, [label %while.cond]
while.end: ; preds = %lor.rhs
indirectbr i8* undef, [label %if.then18, label %return]
if.then18: ; preds = %while.end
indirectbr i8* undef, [label %if.end35, label %lor.lhs.false]
lor.lhs.false: ; preds = %if.then18
indirectbr i8* undef, [label %if.end35, label %return]
if.end35: ; preds = %lor.lhs.false, %if.then18
indirectbr i8* undef, [label %while.cond36]
while.cond36: ; preds = %while.body49, %if.end35
%0 = phi i64 [ %indvar.next13, %while.body49 ], [ 0, %if.end35 ]
indirectbr i8* undef, [label %while.body49, label %lor.rhs42]
lor.rhs42: ; preds = %while.cond36
indirectbr i8* undef, [label %while.body49, label %while.end52]
while.body49: ; preds = %lor.rhs42, %while.cond36
%indvar.next13 = add i64 %0, 1
indirectbr i8* undef, [label %while.cond36]
while.end52: ; preds = %lor.rhs42
indirectbr i8* undef, [label %land.lhs.true, label %return]
land.lhs.true: ; preds = %while.end52
indirectbr i8* undef, [label %while.cond66.preheader, label %return]
while.cond66.preheader: ; preds = %land.lhs.true
indirectbr i8* undef, [label %while.cond66]
while.cond66: ; preds = %while.body77, %while.cond66.preheader
indirectbr i8* undef, [label %land.rhs, label %while.cond81.preheader]
land.rhs: ; preds = %while.cond66
indirectbr i8* undef, [label %while.body77, label %while.cond81.preheader]
while.cond81.preheader: ; preds = %land.rhs, %while.cond66
%tmp45 = add i64 undef, %0
%tmp46 = add i64 %tmp45, undef
indirectbr i8* undef, [label %while.cond81]
while.body77: ; preds = %land.rhs
indirectbr i8* undef, [label %while.cond66]
while.cond81: ; preds = %while.body94, %while.cond81.preheader
%tmp25 = add i64 %tmp46, undef
indirectbr i8* undef, [label %while.body94, label %lor.rhs87]
lor.rhs87: ; preds = %while.cond81
indirectbr i8* undef, [label %while.body94, label %return]
while.body94: ; preds = %lor.rhs87, %while.cond81
indirectbr i8* undef, [label %while.cond81]
return: ; preds = %if.end216, %land.lhs.true183, %land.lhs.true, %while.end52, %lor.lhs.false, %while.end, %entry
ret void
}
; Test a phi operand IV User dominated by a no-preheader loop.
define void @nopreheader3() nounwind uwtable ssp align 2 {
entry:
indirectbr i8* blockaddress(@nopreheader3, %if.end10), [label %if.end22, label %if.end10]
if.end10: ; preds = %entry
indirectbr i8* blockaddress(@nopreheader3, %if.end6.i), [label %if.end22, label %if.end6.i]
if.end6.i: ; preds = %if.end10
indirectbr i8* blockaddress(@nopreheader3, %while.cond2.preheader.i.i), [label %if.then12, label %while.cond2.preheader.i.i]
while.cond2.preheader.i.i: ; preds = %while.end.i18.i, %if.end6.i
indirectbr i8* blockaddress(@nopreheader3, %while.cond2.i.i), [label %while.cond2.i.i]
while.cond2.i.i: ; preds = %while.cond2.i.i, %while.cond2.preheader.i.i
%i1.1.i14.i = phi i32 [ %add.i15.i, %while.cond2.i.i ], [ undef, %while.cond2.preheader.i.i ]
%add.i15.i = add nsw i32 %i1.1.i14.i, undef
indirectbr i8* blockaddress(@nopreheader3, %while.end.i18.i), [label %while.cond2.i.i, label %while.end.i18.i]
while.end.i18.i: ; preds = %while.cond2.i.i
indirectbr i8* blockaddress(@nopreheader3, %while.cond2.preheader.i.i), [label %if.then12, label %while.cond2.preheader.i.i]
if.then12: ; preds = %while.end.i18.i, %if.end6.i
%i1.0.lcssa.i.i = phi i32 [ undef, %if.end6.i ], [ %i1.1.i14.i, %while.end.i18.i ]
indirectbr i8* blockaddress(@nopreheader3, %if.end22), [label %if.end22]
if.end22: ; preds = %if.then12, %if.end10, %entry
ret void
}
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