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PR10386: Don't try to split an edge from an indirectbr.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135534 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2011-07-19 22:59:41 +00:00
parent 14c92467e7
commit 3610604086
2 changed files with 61 additions and 2 deletions
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11
lib/Transforms/Utils/BreakCriticalEdges.cpp
View File

@ -337,6 +337,8 @@ BasicBlock *llvm::SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum,
}
// For each unique exit block...
// FIXME: This code is functionally equivalent to the corresponding
// loop in LoopSimplify.
SmallVector<BasicBlock *, 4> ExitBlocks;
TIL->getExitBlocks(ExitBlocks);
for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i) {
@ -348,10 +350,15 @@ BasicBlock *llvm::SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum,
for (pred_iterator I = pred_begin(Exit), E = pred_end(Exit);
I != E; ++I) {
BasicBlock *P = *I;
if (TIL->contains(P))
if (TIL->contains(P)) {
if (isa<IndirectBrInst>(P->getTerminator())) {
Preds.clear();
break;
}
Preds.push_back(P);
else
} else {
HasPredOutsideOfLoop = true;
}
}
// If there are any preds not in the loop, we'll need to split
// the edges. The Preds.empty() check is needed because a block

52
test/Transforms/LoopStrengthReduce/2011-07-19-CritEdgeBreakCrash.ll Normal file
View File

@ -0,0 +1,52 @@
; ModuleID = '<stdin>'
; RUN: opt < %s -loop-reduce -S | FileCheck %s
; PR10386
declare i1 @foo()
declare i8* @bar(i8*,i8*,i8*,i8*)
define void @f(i64* %a,i64* %b,i64* %c,i64* %d,i64* %e,i64* %f,i64* %g) nounwind uwtable {
entry:
br label %b_throw.preheader
D_BREAK_LBL: ; preds = %indirectgoto
call i1 @foo()
br label %indirectgoto
H_CONST_LBL: ; preds = %indirectgoto
call i1 @foo()
br label %body_failed
H_MPZ_LBL: ; preds = %indirectgoto
%boo3 = call i1 @foo()
br i1 %boo3, label %body_failed, label %while.cond.i
while.cond.i: ; preds = %while.body.i15795, %if.then.i15791
%phi = phi i64 [ %tmp20916, %while.body.i15795 ], [ 0, %H_MPZ_LBL ]
%tmp20916 = add i64 %phi, 1
%incdec.ptr.i15793 = getelementptr i64* %pc.0.lcssa.i1610719352, i64 %tmp20916
%boo2 = call i1 @foo()
br i1 %boo2, label %indirectgoto, label %while.body.i15795
while.body.i15795: ; preds = %while.cond.i
%tmp20.i = load i64* %incdec.ptr.i15793, align 8
%boo1 = call i1 @foo()
br i1 %boo1, label %while.cond.i, label %body_failed
b_throw.preheader: ; preds = %body_failed, %entry
call i1 @foo()
br label %indirectgoto
body_failed:
%pc.0.lcssa.i1610719364 = phi i64* [ %pc.0.lcssa.i1610719352, %indirectgoto ], [ %pc.0.lcssa.i1610719352, %H_MPZ_LBL ], [ %b, %H_CONST_LBL ], [ %pc.0.lcssa.i1610719352, %while.body.i15795 ]
call i1 @foo()
br label %b_throw.preheader
indirectgoto:
%pc.0.lcssa.i1610719352 = phi i64* [ %pc.0.lcssa.i1610719352, %D_BREAK_LBL ], [ %a, %b_throw.preheader ], [ %d, %while.cond.i ]
%p = call i8* @bar(i8* blockaddress(@f, %D_BREAK_LBL), i8* blockaddress(@f, %H_CONST_LBL), i8* blockaddress(@f, %H_MPZ_LBL), i8* blockaddress(@f, %body_failed) )
indirectbr i8* %p, [label %D_BREAK_LBL, label %H_CONST_LBL, label %H_MPZ_LBL, label %body_failed]
}
; CHECK: %p = call i8* @bar(i8* blockaddress(@f, %D_BREAK_LBL), i8* blockaddress(@f, %H_CONST_LBL), i8* blockaddress(@f, %H_MPZ_LBL), i8* blockaddress(@f, %body_failed))
; CHECK: indirectbr i8* %p, [label %D_BREAK_LBL, label %H_CONST_LBL, label %H_MPZ_LBL, label %body_failed]