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Ignore conditions that are outside the loop.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58631 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -167,7 +167,9 @@ static Value *FindLIVLoopCondition(Value *Cond, Loop *L, bool &Changed) {
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// TODO: Handle: br (VARIANT|INVARIANT).
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// TODO: Handle: br (VARIANT|INVARIANT).
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// TODO: Hoist simple expressions out of loops.
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// TODO: Hoist simple expressions out of loops.
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if (L->isLoopInvariant(Cond)) return Cond;
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if (Instruction *I = dyn_cast<Instruction>(Cond))
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if (!L->contains(I->getParent()))
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return 0;
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if (BinaryOperator *BO = dyn_cast<BinaryOperator>(Cond))
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if (BinaryOperator *BO = dyn_cast<BinaryOperator>(Cond))
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if (BO->getOpcode() == Instruction::And ||
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if (BO->getOpcode() == Instruction::And ||
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47
test/Transforms/LoopUnswitch/2008-11-03-Invariant.ll
Normal file
47
test/Transforms/LoopUnswitch/2008-11-03-Invariant.ll
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@ -0,0 +1,47 @@
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; RUN: llvm-as < %s | opt -loop-unswitch -stats | not grep loop-unswitch
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define void @test_fc_while_continue_or(float %x, float %y, float* %result) nounwind {
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entry:
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br label %bb2.outer
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bb: ; preds = %bb2
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%0 = add float %5, %z.0 ; <float> [#uses=3]
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%1 = fcmp oeq float %0, 0.000000e+00 ; <i1> [#uses=1]
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br i1 %1, label %bb2, label %bb1
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bb1: ; preds = %bb
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%.lcssa = phi float [ %0, %bb ] ; <float> [#uses=1]
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%z.0.lcssa1 = phi float [ %z.0, %bb ] ; <float> [#uses=0]
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%2 = add float %x_addr.0.ph, 1.000000e+00 ; <float> [#uses=1]
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br label %bb2.outer
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bb2.outer: ; preds = %bb1, %entry
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%z.0.ph = phi float [ 0.000000e+00, %entry ], [ %.lcssa, %bb1 ] ; <float> [#uses=1]
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%x_addr.0.ph = phi float [ %x, %entry ], [ %2, %bb1 ] ; <float> [#uses=3]
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%3 = fcmp une float %x_addr.0.ph, 0.000000e+00 ; <i1> [#uses=1]
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%4 = fcmp une float %y, 0.000000e+00 ; <i1> [#uses=1]
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%or.cond = or i1 %3, %4 ; <i1> [#uses=1]
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%5 = mul float %x_addr.0.ph, %y ; <float> [#uses=1]
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br label %bb2
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bb2: ; preds = %bb2.outer, %bb
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%z.0 = phi float [ %0, %bb ], [ %z.0.ph, %bb2.outer ] ; <float> [#uses=3]
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br i1 %or.cond, label %bb, label %bb4
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bb4: ; preds = %bb2
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%z.0.lcssa = phi float [ %z.0, %bb2 ] ; <float> [#uses=1]
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store float %z.0.lcssa, float* %result, align 4
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ret void
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}
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define i32 @main() nounwind {
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entry:
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%z = alloca [10 x i32] ; <[10 x i32]*> [#uses=2]
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%0 = call i32 (...)* @test_fc_while_or(i32 0, i32 0, [10 x i32]* %z) nounwind ; <i32> [#uses=0]
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%1 = getelementptr [10 x i32]* %z, i32 0, i32 0 ; <i32*> [#uses=1]
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%2 = load i32* %1, align 4 ; <i32> [#uses=1]
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ret i32 %2
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}
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declare i32 @test_fc_while_or(...)
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