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SCEVExpander: Fold constant PHIs harder. The logic below only understands proper IVs.
PR20093. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211433 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -16,6 +16,7 @@
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#include "llvm/Analysis/ScalarEvolutionExpander.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallSet.h"
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#include "llvm/Analysis/InstructionSimplify.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/IR/DataLayout.h"
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@ -1706,7 +1707,7 @@ unsigned SCEVExpander::replaceCongruentIVs(Loop *L, const DominatorTree *DT,
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// Fold constant phis. They may be congruent to other constant phis and
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// would confuse the logic below that expects proper IVs.
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if (Value *V = Phi->hasConstantValue()) {
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if (Value *V = SimplifyInstruction(Phi, SE.DL, SE.TLI, SE.DT)) {
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Phi->replaceAllUsesWith(V);
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DeadInsts.push_back(Phi);
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++NumElim;
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@ -0,0 +1,51 @@
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; RUN: opt -S -loop-unswitch -instcombine -indvars < %s | FileCheck %s
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@c = external global i32**, align 8
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define void @test1() {
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entry:
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br i1 undef, label %for.end12, label %for.cond.preheader
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for.cond.preheader: ; preds = %entry
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%0 = load i32*** @c, align 8
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%1 = load i32** %0, align 8
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%2 = load i32* %1, align 4
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br label %for.body
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for.body: ; preds = %for.cond.backedge, %for.body9.us, %for.cond.preheader
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%3 = phi i32* [ %1, %for.cond.preheader ], [ %3, %for.cond.backedge ], [ %6, %for.body9.us ]
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%4 = phi i32 [ %2, %for.cond.preheader ], [ undef, %for.cond.backedge ], [ %7, %for.body9.us ]
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%i.024 = phi i32 [ 0, %for.cond.preheader ], [ %inc, %for.cond.backedge ], [ 0, %for.body9.us ]
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%tobool1 = icmp eq i32 %4, 0
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br i1 %tobool1, label %if.end, label %for.cond.backedge
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if.end: ; preds = %for.body
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%5 = load i32* %3, align 4
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%tobool4 = icmp eq i32 %5, 0
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br i1 %tobool4, label %for.cond3, label %for.body9.preheader
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for.body9.preheader: ; preds = %if.end
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%tobool8 = icmp eq i32 %i.024, 1
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br i1 %tobool8, label %for.body9.us, label %for.body9
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for.body9.us: ; preds = %for.body9.preheader
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%6 = load i32** undef, align 8
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%7 = load i32* %6, align 4
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br label %for.body
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for.cond3: ; preds = %for.cond3, %if.end
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br label %for.cond3
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for.body9: ; preds = %for.body9, %for.body9.preheader
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br label %for.body9
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for.cond.backedge: ; preds = %for.body
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%inc = add nsw i32 %i.024, 1
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br i1 false, label %for.body, label %for.end12
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for.end12: ; preds = %for.cond.backedge, %entry
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ret void
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; CHECK-LABEL: @test1
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; CHECK-NOT: phi
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}
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