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2461d79aa9
vector and extraneous loop over it, 2) not delete globals used by phis/selects etc which could actually be useful. This fixes PR3321. Many thanks to Duncan for narrowing this down. llvm-svn: 62201
36 lines
1.3 KiB
LLVM
36 lines
1.3 KiB
LLVM
; RUN: llvm-as < %s | opt -globalopt | llvm-dis | grep {phi.*@head}
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; PR3321
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
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target triple = "x86_64-unknown-linux-gnu"
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%struct.node = type { %struct.node*, i32 }
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@head = internal global %struct.node* null ; <%struct.node**> [#uses=2]
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@node = internal global %struct.node { %struct.node* null, i32 42 }, align 16 ; <%struct.node*> [#uses=1]
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define i32 @f() nounwind {
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entry:
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store %struct.node* @node, %struct.node** @head, align 8
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br label %bb1
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bb: ; preds = %bb1
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%0 = getelementptr %struct.node* %t.0, i64 0, i32 1 ; <i32*> [#uses=1]
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%1 = load i32* %0, align 4 ; <i32> [#uses=1]
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%2 = getelementptr %struct.node* %t.0, i64 0, i32 0 ; <%struct.node**> [#uses=1]
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br label %bb1
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bb1: ; preds = %bb, %entry
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%value.0 = phi i32 [ undef, %entry ], [ %1, %bb ] ; <i32> [#uses=1]
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%t.0.in = phi %struct.node** [ @head, %entry ], [ %2, %bb ] ; <%struct.node**> [#uses=1]
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%t.0 = load %struct.node** %t.0.in ; <%struct.node*> [#uses=3]
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%3 = icmp eq %struct.node* %t.0, null ; <i1> [#uses=1]
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br i1 %3, label %bb2, label %bb
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bb2: ; preds = %bb1
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ret i32 %value.0
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}
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define i32 @main() nounwind {
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entry:
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%0 = call i32 @f() nounwind ; <i32> [#uses=1]
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ret i32 %0
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}
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