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Add incoming value from header only if phi node has any use inside the loop.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48738 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2008-03-24 20:16:14 +00:00
parent 20b7bda692
commit 60a12907c3
2 changed files with 72 additions and 2 deletions
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5
lib/Transforms/Scalar/LoopIndexSplit.cpp
View File

@ -1665,8 +1665,9 @@ void LoopIndexSplit::updatePHINodes(BasicBlock *ExitBB, BasicBlock *Latch,
break;
}
assert (NewV && "Unable to find new incoming value for exit block PHI");
PN->addIncoming(NewV, Header);
// Add incoming value from header only if PN has any use inside the loop.
if (NewV)
PN->addIncoming(NewV, Header);
} else if (Instruction *PHI = dyn_cast<Instruction>(V)) {
// If this instruction is IVIncrement then IV is new incoming value

69
test/Transforms/LoopIndexSplit/2008-03-24-ExitPhi.ll Normal file
View File

@ -0,0 +1,69 @@
; RUN: llvm-as < %s | opt -loop-index-split -disable-output
; Handle Exit block phis that do not have any use inside the loop.
%struct.ATOM = type { double, double, double, double, double, double, i32, double, double, double, double, i8*, i8, [9 x i8], double, double, double, double, double, double, double, double, double, double, double, double, double, double, double, double, double, double, double, double, double, double, double, double, double, [200 x i8*], [32 x i8*], [32 x i8], i32 }
%struct.FILE = type { i8*, i32, i32, i16, i16, %struct.__sbuf, i32, i8*, i32 (i8*)*, i32 (i8*, i8*, i32)*, i64 (i8*, i64, i32)*, i32 (i8*, i8*, i32)*, %struct.__sbuf, %struct.__sFILEX*, i32, [3 x i8], [1 x i8], %struct.__sbuf, i32, i64 }
%struct.__sFILEX = type opaque
%struct.__sbuf = type { i8*, i32 }
define i32 @math([80 x i8]* %tokens, double* %fvalue, i32* %ivalue, %struct.FILE* %ip, %struct.FILE* %op, i32 %echo) nounwind {
entry:
br i1 false, label %bb.i, label %bb35.i
bb.i: ; preds = %entry
br i1 false, label %bb6.i, label %bb9.i
bb9.i: ; preds = %bb.i
ret i32 0
bb35.i: ; preds = %entry
ret i32 0
bb6.i: ; preds = %bb.i
br i1 false, label %a_l2_f.exit, label %bb16.i
bb16.i: ; preds = %bb6.i
ret i32 0
a_l2_f.exit: ; preds = %bb6.i
br i1 false, label %bb7.i97, label %bb6.i71
bb6.i71: ; preds = %a_l2_f.exit
ret i32 0
bb7.i97: ; preds = %a_l2_f.exit
br i1 false, label %bb, label %bb18.i102
bb18.i102: ; preds = %bb7.i97
ret i32 0
bb: ; preds = %bb7.i97
br i1 false, label %bb38, label %AFOUND
bb38: ; preds = %bb
br i1 false, label %bb111, label %bb7.i120
AFOUND: ; preds = %bb
ret i32 0
bb7.i120: ; preds = %bb38
ret i32 0
bb111: ; preds = %bb38
switch i32 0, label %bb574 [
i32 1, label %bb158
i32 0, label %bb166
]
bb158: ; preds = %bb111
ret i32 0
bb166: ; preds = %bb111
ret i32 0
bb574: ; preds = %bb111
br i1 false, label %bb11.i249, label %bb600
bb11.i249: ; preds = %bb574
br i1 false, label %bb11.i265, label %bb596
bb11.i265: ; preds = %bb590, %bb11.i249
%i.1.reg2mem.0 = phi i32 [ %tmp589.reg2mem.0, %bb590 ], [ 0, %bb11.i249 ] ; <i32> [#uses=2]
%tmp13.i264 = icmp slt i32 %i.1.reg2mem.0, 1 ; <i1> [#uses=1]
br i1 %tmp13.i264, label %bb16.i267, label %bb30.i279
bb16.i267: ; preds = %bb11.i265
br label %bb590
bb30.i279: ; preds = %bb11.i265
br label %bb590
bb590: ; preds = %bb30.i279, %bb16.i267
%tmp5876282.reg2mem.0 = phi %struct.ATOM* [ null, %bb30.i279 ], [ null, %bb16.i267 ] ; <%struct.ATOM*> [#uses=1]
%tmp589.reg2mem.0 = add i32 %i.1.reg2mem.0, 1 ; <i32> [#uses=2]
%tmp593 = icmp slt i32 %tmp589.reg2mem.0, 0 ; <i1> [#uses=1]
br i1 %tmp593, label %bb11.i265, label %bb596
bb596: ; preds = %bb590, %bb11.i249
%ap.0.reg2mem.0 = phi %struct.ATOM* [ null, %bb11.i249 ], [ %tmp5876282.reg2mem.0, %bb590 ] ; <%struct.ATOM*> [#uses=0]
ret i32 0
bb600: ; preds = %bb574
ret i32 0
}