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Nick Lewycky's patch.

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While hosting instruction check PHI node.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57025 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2008-10-03 18:57:37 +00:00
parent 2d2649ac93
commit 20da1f07da
2 changed files with 37 additions and 1 deletions
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2
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -1051,7 +1051,7 @@ static bool SpeculativelyExecuteBB(BranchInst *BI, BasicBlock *BB1) {
BasicBlock::iterator InsertPos = BI;
if (InsertPos != BIParent->begin())
--InsertPos;
if (InsertPos == BrCond) {
if (InsertPos == BrCond && !isa<PHINode>(BrCond)) {
SmallPtrSet<Instruction *, 4> BB1Insns;
for(BasicBlock::iterator BB1I = BB1->begin(), BB1E = BB1->end();
BB1I != BB1E; ++BB1I)

36
test/Transforms/SimplifyCFG/2008-10-03-SpeculativelyExecuteBeforePHI.ll Normal file
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@ -0,0 +1,36 @@
; RUN: llvm-as < %s | opt -simplifycfg
; PR2855
define i32 @_Z1fPii(i32* %b, i32 %f) nounwind {
entry:
br label %bb
bb: ; preds = %bb9, %bb7, %bb, %entry
%__c2.2 = phi i32 [ undef, %entry ], [ %__c2.1, %bb7 ], [ %__c2.1, %bb9 ] ; <i32> [#uses=2]
%s.0 = phi i32 [ 0, %entry ], [ 0, %bb7 ], [ %2, %bb9 ] ; <i32> [#uses=1]
br label %bb1
bb1: ; preds = %bb
%0 = icmp slt i32 0, %f ; <i1> [#uses=1]
br i1 %0, label %bb3, label %bb6
bb3: ; preds = %bb1
%1 = icmp eq i32 0, 0 ; <i1> [#uses=1]
br i1 %1, label %bb6, label %bb5
bb5: ; preds = %bb3
br label %bb7
bb6: ; preds = %bb3, %bb1
%__c2.0 = phi i32 [ 0, %bb3 ], [ %__c2.2, %bb1 ] ; <i32> [#uses=1]
br label %bb7
bb7: ; preds = %bb6, %bb5
%__c2.1 = phi i32 [ 0, %bb5 ], [ %__c2.0, %bb6 ] ; <i32> [#uses=2]
%iftmp.1.0 = phi i1 [ false, %bb5 ], [ true, %bb6 ] ; <i1> [#uses=1]
br i1 %iftmp.1.0, label %bb, label %bb9
bb9: ; preds = %bb7
%2 = add i32 %s.0, 2 ; <i32> [#uses=1]
br label %bb
}