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Ignore conditions that are outside the loop.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58631 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2008-11-03 19:38:07 +00:00
parent 06a1242207
commit 265ca5dff5
2 changed files with 51 additions and 2 deletions
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6
lib/Transforms/Scalar/LoopUnswitch.cpp
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@ -167,8 +167,10 @@ static Value *FindLIVLoopCondition(Value *Cond, Loop *L, bool &Changed) {
// TODO: Handle: br (VARIANT|INVARIANT). // TODO: Handle: br (VARIANT|INVARIANT).
// TODO: Hoist simple expressions out of loops. // TODO: Hoist simple expressions out of loops.
if (L->isLoopInvariant(Cond)) return Cond; if (Instruction *I = dyn_cast<Instruction>(Cond))
if (!L->contains(I->getParent()))
return 0;
if (BinaryOperator *BO = dyn_cast<BinaryOperator>(Cond)) if (BinaryOperator *BO = dyn_cast<BinaryOperator>(Cond))
if (BO->getOpcode() == Instruction::And || if (BO->getOpcode() == Instruction::And ||
BO->getOpcode() == Instruction::Or) { BO->getOpcode() == Instruction::Or) {

47
test/Transforms/LoopUnswitch/2008-11-03-Invariant.ll Normal file
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@ -0,0 +1,47 @@
; RUN: llvm-as < %s | opt -loop-unswitch -stats | not grep loop-unswitch
define void @test_fc_while_continue_or(float %x, float %y, float* %result) nounwind {
entry:
br label %bb2.outer
bb: ; preds = %bb2
%0 = add float %5, %z.0 ; <float> [#uses=3]
%1 = fcmp oeq float %0, 0.000000e+00 ; <i1> [#uses=1]
br i1 %1, label %bb2, label %bb1
bb1: ; preds = %bb
%.lcssa = phi float [ %0, %bb ] ; <float> [#uses=1]
%z.0.lcssa1 = phi float [ %z.0, %bb ] ; <float> [#uses=0]
%2 = add float %x_addr.0.ph, 1.000000e+00 ; <float> [#uses=1]
br label %bb2.outer
bb2.outer: ; preds = %bb1, %entry
%z.0.ph = phi float [ 0.000000e+00, %entry ], [ %.lcssa, %bb1 ] ; <float> [#uses=1]
%x_addr.0.ph = phi float [ %x, %entry ], [ %2, %bb1 ] ; <float> [#uses=3]
%3 = fcmp une float %x_addr.0.ph, 0.000000e+00 ; <i1> [#uses=1]
%4 = fcmp une float %y, 0.000000e+00 ; <i1> [#uses=1]
%or.cond = or i1 %3, %4 ; <i1> [#uses=1]
%5 = mul float %x_addr.0.ph, %y ; <float> [#uses=1]
br label %bb2
bb2: ; preds = %bb2.outer, %bb
%z.0 = phi float [ %0, %bb ], [ %z.0.ph, %bb2.outer ] ; <float> [#uses=3]
br i1 %or.cond, label %bb, label %bb4
bb4: ; preds = %bb2
%z.0.lcssa = phi float [ %z.0, %bb2 ] ; <float> [#uses=1]
store float %z.0.lcssa, float* %result, align 4
ret void
}
define i32 @main() nounwind {
entry:
%z = alloca [10 x i32] ; <[10 x i32]*> [#uses=2]
%0 = call i32 (...)* @test_fc_while_or(i32 0, i32 0, [10 x i32]* %z) nounwind ; <i32> [#uses=0]
%1 = getelementptr [10 x i32]* %z, i32 0, i32 0 ; <i32*> [#uses=1]
%2 = load i32* %1, align 4 ; <i32> [#uses=1]
ret i32 %2
}
declare i32 @test_fc_while_or(...)