derek.holloway
7502bf64a4
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40 lines
1.3 KiB
LLVM
40 lines
1.3 KiB
LLVM
; RUN: opt -passes=called-value-propagation -S < %s | FileCheck %s
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target triple = "aarch64"
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@global_function = internal unnamed_addr global ptr null, align 8
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@global_scalar = internal unnamed_addr global i64 zeroinitializer
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; This test checks that we propagate the functions through a select
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; instruction, and attach !callees metadata to the call. Such metadata can
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; enable optimizations of this code sequence.
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;
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; For example, since both of the targeted functions have the "norecurse"
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; attribute, the function attributes pass can be made to infer that
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; "@test_select" is also norecurse. This would allow the globals optimizer to
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; localize "@global_scalar". The function could then be further simplified to
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; always return the constant "1", eliminating the load and store instructions.
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;
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; CHECK: call void %tmp0(), !callees ![[MD:[0-9]+]]
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; CHECK: ![[MD]] = !{ptr @norecurse_1, ptr @norecurse_2}
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;
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define i64 @test_select_entry(i1 %flag) {
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entry:
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%tmp0 = call i64 @test_select(i1 %flag)
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ret i64 %tmp0
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}
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define internal i64 @test_select(i1 %flag) {
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entry:
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%tmp0 = select i1 %flag, ptr @norecurse_1, ptr @norecurse_2
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store i64 1, ptr @global_scalar
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call void %tmp0()
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%tmp1 = load i64, ptr @global_scalar
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ret i64 %tmp1
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}
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declare void @norecurse_1() #0
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declare void @norecurse_2() #0
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attributes #0 = { norecurse }
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