derek.holloway
7502bf64a4
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58 lines
2.2 KiB
LLVM
58 lines
2.2 KiB
LLVM
; RUN: opt -passes='loop-mssa(simple-loop-unswitch<nontrivial>),instcombine,indvars' -S %s | FileCheck %s
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; This used to crash in SCEVExpander when there were congruent phis with and
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; undef incoming value from the loop header. The -loop-unswitch -passes=instcombine is
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; necessary to create just this pattern, which is essentially a nop and gets
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; folded away aggressively if spelled out in IR directly.
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; PR 20093
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@c = external global ptr, align 8
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define void @test1(i1 %arg) {
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entry:
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br i1 %arg, label %for.end12, label %for.cond.preheader
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for.cond.preheader: ; preds = %entry
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%0 = load ptr, ptr @c, align 8
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%1 = load ptr, ptr %0, align 8
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%2 = load i32, ptr %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 ptr [ %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, ptr %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 ptr, ptr undef, align 8
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%7 = load i32, ptr %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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