63 lines
1.8 KiB
LLVM
63 lines
1.8 KiB
LLVM
; RUN: opt -called-value-propagation -S < %s | FileCheck %s
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target triple = "aarch64-unknown-linux-gnueabi"
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@global_function = internal unnamed_addr global void ()* null, align 8
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@global_array = common unnamed_addr global i64* null, align 8
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; This test checks that we propagate the functions through an internal global
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; variable, and attach !callees metadata to the call. Such metadata can enable
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; optimizations of this code sequence.
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;
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; For example, since both of the targeted functions have the "nounwind" and
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; "readnone" function attributes, LICM can be made to move the call and the
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; function pointer load outside the loop. This would then enable the loop
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; vectorizer to vectorize the sum reduction.
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;
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; CHECK: call void %tmp0(), !callees ![[MD:[0-9]+]]
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; CHECK: ![[MD]] = !{void ()* @invariant_1, void ()* @invariant_2}
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;
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define i64 @test_memory_entry(i64 %n, i1 %flag) {
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entry:
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br i1 %flag, label %then, label %else
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then:
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store void ()* @invariant_1, void ()** @global_function
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br label %merge
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else:
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store void ()* @invariant_2, void ()** @global_function
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br label %merge
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merge:
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%tmp1 = call i64 @test_memory(i64 %n)
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ret i64 %tmp1
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}
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define internal i64 @test_memory(i64 %n) {
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entry:
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%array = load i64*, i64** @global_array
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br label %for.body
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for.body:
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%i = phi i64 [ 0, %entry ], [ %i.next, %for.body ]
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%r = phi i64 [ 0, %entry ], [ %tmp3, %for.body ]
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%tmp0 = load void ()*, void ()** @global_function
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call void %tmp0()
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%tmp1 = getelementptr inbounds i64, i64* %array, i64 %i
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%tmp2 = load i64, i64* %tmp1
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%tmp3 = add i64 %tmp2, %r
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%i.next = add nuw nsw i64 %i, 1
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%cond = icmp slt i64 %i.next, %n
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br i1 %cond, label %for.body, label %for.end
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for.end:
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%tmp4 = phi i64 [ %tmp3, %for.body ]
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ret i64 %tmp4
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}
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declare void @invariant_1() #0
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declare void @invariant_2() #0
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attributes #0 = { nounwind readnone }
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