forked from OSchip/llvm-project
179 lines
5.1 KiB
LLVM
179 lines
5.1 KiB
LLVM
; Test the behavior of GlobalDCE in conjunction with comdats.
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;
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; RUN: opt < %s -globaldce -S | FileCheck %s
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; First test checks that if one function in a comdat group is used, both other
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; functions and other globals even if unused will be preserved.
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$test1_c = comdat any
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; CHECK: $test1_c = comdat any
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; Second test checks that if one function in a comdat group is used, both other
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; functions and other globals even if unused will be preserved.
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$test2_c = comdat any
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; CHECK: $test2_c = comdat any
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; Third test checks that calling a function in a comdat group with an alias
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; preserves the alias.
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$test3_c = comdat any
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; CHECK: $test3_c = comdat any
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; Fourth test checks that calling an alias in a comdat group with a function
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; preserves the function. (This is the trivial case as the alias uses the
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; function.)
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$test4_c = comdat any
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; CHECK: $test4_c = comdat any
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; Fifth test checks that calling a function in a comdat group that is used as
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; the resolver of an ifunc doesn't preserve that ifunc. ifunc symbols don't
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; participate in the comdat group of their resolver function as they are
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; considered separate objects.
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$test5_c = comdat any
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; CHECK: $test5_c = comdat any
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; Sixth test checks that calling an ifunc whose resolver is in a comdat group
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; preserves the resolver. This is the trivial case as the ifunc uses the
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; resolver.
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$test6_c = comdat any
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; CHECK: $test6_c = comdat any
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; Seventh test checks that we can eliminate a comdat when it has only one dead function participant.
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$test7_c = comdat any
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; CHECK-NOT: $test7_c = comdat any
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; Eighth test checks that we can eliminate a comdat when it has only one dead global participant.
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$test8_c = comdat any
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; CHECK-NOT: $test8_c = comdat any
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; Ninth test checks that we can eliminate a comdat when there are multiple
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; dead participants.
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$test9_c = comdat any
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; CHECK-NOT: $test9_c = comdat any
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; Tenth test checks that we can eliminate a comdat when it has multiple
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; participants that form internal cyclic uses but are never used externally and
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; thus the entire ifunc can safely be eliminated.
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$test10_c = comdat any
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; CHECK-NOT: $test10_c = comdat any
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@test1_gv = linkonce_odr unnamed_addr global i32 42, comdat($test1_c)
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; CHECK: @test1_gv = linkonce_odr unnamed_addr global
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@test2_used = linkonce_odr unnamed_addr global i32 42, comdat($test2_c)
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; CHECK: @test2_used = linkonce_odr unnamed_addr global
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@test2_gv = linkonce_odr unnamed_addr global i32 42, comdat($test2_c)
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; CHECK: @test2_gv = linkonce_odr unnamed_addr global
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@test8_gv = linkonce_odr unnamed_addr global i32 42, comdat($test8_c)
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; CHECK-NOT: @test8_gv
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@test9_gv = linkonce_odr unnamed_addr global i32 42, comdat($test9_c)
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; CHECK-NOT: @test9_gv
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@test10_gv = linkonce_odr unnamed_addr global void ()* @test10_f, comdat($test10_c)
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; CHECK-NOT: @test10_gv
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@test3_a = linkonce_odr unnamed_addr alias void (), void ()* @test3_f
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; CHECK: @test3_a = linkonce_odr unnamed_addr alias
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@test4_a = linkonce_odr unnamed_addr alias void (), void ()* @test4_f
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; CHECK: @test4_a = linkonce_odr unnamed_addr alias
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@test10_a = linkonce_odr unnamed_addr alias void (), void ()* @test10_g
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; CHECK-NOT: @test10_a
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@test5_if = linkonce_odr ifunc void (), void ()* ()* @test5_f
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; CHECK-NOT: @test5_if
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@test6_if = linkonce_odr ifunc void (), void ()* ()* @test6_f
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; CHECK: @test6_if = linkonce_odr ifunc
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; This function is directly used and so cannot be eliminated.
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define linkonce_odr void @test1_used() comdat($test1_c) {
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; CHECK: define linkonce_odr void @test1_used()
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entry:
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ret void
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}
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define linkonce_odr void @test1_f() comdat($test1_c) {
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; CHECK: define linkonce_odr void @test1_f()
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entry:
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ret void
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}
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; Now test that a function, global variable, alias, and ifunc in the same
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; comdat are kept.
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define linkonce_odr void @test2_f() comdat($test2_c) {
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; CHECK: define linkonce_odr void @test2_f()
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entry:
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ret void
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}
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define linkonce_odr void @test3_f() comdat($test3_c) {
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; CHECK: define linkonce_odr void @test3_f()
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entry:
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ret void
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}
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define linkonce_odr void @test4_f() comdat($test4_c) {
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; CHECK: define linkonce_odr void @test4_f()
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entry:
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ret void
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}
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declare void @test_external()
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define linkonce_odr void ()* @test5_f() comdat($test5_c) {
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; CHECK: define linkonce_odr void ()* @test5_f()
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entry:
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ret void ()* @test_external
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}
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define linkonce_odr void ()* @test6_f() comdat($test6_c) {
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; CHECK: define linkonce_odr void ()* @test6_f()
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entry:
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ret void ()* @test_external
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}
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define linkonce_odr void @test7_f() comdat($test7_c) {
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; CHECK-NOT: @test7_f
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entry:
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ret void
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}
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define linkonce_odr void @test9_f() comdat($test9_c) {
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; CHECK-NOT: @test9_f
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entry:
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ret void
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}
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define linkonce_odr void @test10_f() comdat($test10_c) {
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; CHECK-NOT: @test10_f
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entry:
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%gv = load void ()*, void ()** @test10_gv
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call void @test10_a()
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ret void
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}
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define linkonce_odr void @test10_g() comdat($test10_c) {
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; CHECK-NOT: @test10_g
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entry:
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call void @test10_f()
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ret void
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}
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; An external function to pin as "used" various things above that shouldn't be
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; eliminated.
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define void @external_user() {
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call void @test1_used()
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%gv = load i32, i32* @test2_used
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call void @test3_f()
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call void @test4_a()
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%fptr = call void() *@test5_f()
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call void @test6_if()
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ret void
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}
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