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llvm-6502/test/Transforms/LoopStrengthReduce/2012-03-15-nopreheader.ll

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LSR fix: Add isSimplifiedLoopNest to IVUsers analysis. Only record IVUsers that are dominated by simplified loop headers. Otherwise SCEVExpander will crash while looking for a preheader. I previously tried to work around this in LSR itself, but that was insufficient. This way, LSR can continue to run if some uses are not in simple loops, as long as we don't attempt to analyze those users. Fixes <rdar://problem/11049788> Segmentation fault: 11 in LoopStrengthReduce git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152892 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-16 03:16:56 +00:00
; 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
}
LSR: fix IVUsers isSimplifiedLoopNest to perform a full domtree walk instead of skipping the current loop. My prior fix was incomplete because of an overzealous compile-time optimization: Better fix for: <rdar://problem/11049788> Segmentation fault: 11 in LoopStrengthReduce git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153131 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-20 21:24:40 +00:00
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
; Another case with a dominating loop that does not contain the IV
; User. Just make sure it doesn't assert.
LSR: fix IVUsers isSimplifiedLoopNest to perform a full domtree walk instead of skipping the current loop. My prior fix was incomplete because of an overzealous compile-time optimization: Better fix for: <rdar://problem/11049788> Segmentation fault: 11 in LoopStrengthReduce git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153131 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-20 21:24:40 +00:00
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
}
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
; 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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