forked from OSchip/llvm-project
55 lines
1.5 KiB
LLVM
55 lines
1.5 KiB
LLVM
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; RUN: opt < %s -instcombine -globals-aa -licm -S | FileCheck %s
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; Make sure -globals-aa ignores dead uses of globals.
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@a = internal global i32 0, align 4
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@c = common global i32 0, align 4
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; Function Attrs: nounwind
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define i32 @g() {
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; Make sure the load of @a is hoisted.
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; CHECK-LABEL: define i32 @g()
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; CHECK: entry:
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; CHECK-NEXT: load i32, i32* @a, align 4
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; CHECK-NEXT: br label %for.cond
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entry:
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%sum.0 = phi i32 [ 0, %entry ], [ %add, %for.inc ]
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%cmp = icmp slt i32 %i.0, 1000
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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%0 = load i32, i32* @a, align 4
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%add = add nsw i32 %sum.0, %0
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call void @f()
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br label %for.inc
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for.inc: ; preds = %for.body
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%inc = add nsw i32 %i.0, 1
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br label %for.cond
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for.end: ; preds = %for.cond
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ret i32 %sum.0
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}
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; Function Attrs: nounwind
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define internal void @f() {
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entry:
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%tobool = icmp ne i32 0, 0
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br i1 %tobool, label %if.then, label %if.end
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if.then: ; preds = %entry
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store i32 ptrtoint (i32* @a to i32), i32* @c, align 4
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br label %if.end
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if.end: ; preds = %if.then, %entry
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%0 = load i32, i32* @c, align 4
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%inc = add nsw i32 %0, 1
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store i32 %inc, i32* @c, align 4
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ret void
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}
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