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Fix normalization and de-normalization of non-affine SCEVs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105480 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -105,22 +105,25 @@ const SCEV *llvm::TransformForPostIncUse(TransformKind Kind,
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case NormalizeAutodetect:
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if (Instruction *OI = dyn_cast<Instruction>(OperandValToReplace))
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if (IVUseShouldUsePostIncValue(User, OI, L, &DT)) {
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Result = SE.getMinusSCEV(Result, AR->getStepRecurrence(SE));
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const SCEV *TransformedStep =
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TransformForPostIncUse(Kind, AR->getStepRecurrence(SE),
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User, OperandValToReplace, Loops, SE, DT);
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Result = SE.getMinusSCEV(Result, TransformedStep);
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Loops.insert(L);
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}
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break;
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case Normalize:
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if (Loops.count(L))
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Result = SE.getMinusSCEV(Result, AR->getStepRecurrence(SE));
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break;
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case Denormalize:
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if (Loops.count(L)) {
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const SCEV *TransformedStep =
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TransformForPostIncUse(Kind, AR->getStepRecurrence(SE),
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User, OperandValToReplace, Loops, SE, DT);
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Result = SE.getAddExpr(Result, TransformedStep);
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Result = SE.getMinusSCEV(Result, TransformedStep);
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}
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break;
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case Denormalize:
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if (Loops.count(L))
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Result = SE.getAddExpr(Result, AR->getStepRecurrence(SE));
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break;
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}
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return Result;
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}
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23
test/CodeGen/X86/lsr-nonaffine.ll
Normal file
23
test/CodeGen/X86/lsr-nonaffine.ll
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@ -0,0 +1,23 @@
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; RUN: llc -march=x86-64 < %s | FileCheck %s
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; LSR should compute the correct starting values for this loop. Note that
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; it's not necessarily LSR's job to compute loop exit expressions; that's
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; indvars' job.
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; CHECK: movl $12
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; CHECK: movl $42
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define i32 @real_symmetric_eigen(i32 %n) nounwind {
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while.body127: ; preds = %while.cond122
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br label %while.cond141
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while.cond141: ; preds = %while.cond141, %while.body127
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%0 = phi i32 [ 7, %while.body127 ], [ %indvar.next67, %while.cond141 ] ; <i32> [#uses=3]
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%indvar.next67 = add i32 %0, 1 ; <i32> [#uses=1]
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%t = icmp slt i32 %indvar.next67, %n
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br i1 %t, label %if.then171, label %while.cond141
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if.then171: ; preds = %while.cond141
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%mul150 = mul i32 %0, %0 ; <i32> [#uses=1]
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%add174 = add i32 %mul150, %0 ; <i32> [#uses=1]
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ret i32 %add174
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}
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