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556dfb9bf9
clang/lib/CodeGen/CodeGenModule sets dso_local on applicable function declarations, we don't need to duplicate the work in TargetMachine:shouldAssumeDSOLocal. (Actually the long-term goal (started by r324535) is to drop TargetMachine::shouldAssumeDSOLocal.) By not implying dso_local, we will respect dso_local/dso_preemptable specifiers set by the frontend. This allows the proposed -fno-direct-access-external-data option to work with -fno-pic and prevent a canonical PLT entry (SHN_UNDEF with non-zero st_value) when taking the address of a function symbol. This patch should be NFC in terms of the Clang emitted assembly because the case we don't set dso_local is a case Clang sets dso_local. However, some tests don't set dso_local on some function declarations and expose some differences. Most tests have been fixed to be more robust in the previous commit.
46 lines
1.4 KiB
LLVM
46 lines
1.4 KiB
LLVM
; RUN: llc < %s -mcpu=generic -mtriple=x86_64-linux-gnu -relocation-model=pic \
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; RUN: | FileCheck -check-prefix=X64 --check-prefix=PIC %s
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; RUN: llc < %s -mcpu=generic -mtriple=x86_64-linux-gnu \
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; RUN: | FileCheck -check-prefix=X64 --check-prefix=STATIC %s
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define i32 @fp_weakfunc() {
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; X64: weakfunc@GOTPCREL(%rip)
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ret i32 select (i1 icmp ne (i32 ()* @weakfunc, i32 ()* null), i32 1, i32 0)
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}
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declare extern_weak i32 @weakfunc() nonlazybind
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define void @memset_call(i8* nocapture %a, i8 %c, i32 %n) {
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; X64: callq *memset@GOTPCREL(%rip)
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call void @llvm.memset.p0i8.i32(i8* %a, i8 %c, i32 %n, i1 false)
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ret void
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}
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define void @memcpy_call(i8* nocapture %a, i8* nocapture readonly %b, i64 %n) {
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; X64: callq *memcpy@GOTPCREL(%rip)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %a, i8* %b, i64 %n, i32 1, i1 false)
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ret void
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}
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define i32 @main() {
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; X64: callq *foo@GOTPCREL(%rip)
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; PIC: callq bar@PLT
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; STATIC: callq bar@PLT
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; X64: callq baz
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%retval = alloca i32, align 4
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store i32 0, i32* %retval, align 4
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%call1 = call i32 @foo()
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%call2 = call i32 @bar()
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%call3 = call i32 @baz()
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ret i32 0
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}
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declare i32 @foo() nonlazybind
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declare i32 @bar()
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declare hidden i32 @baz() nonlazybind
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i32, i1)
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declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i1)
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!llvm.module.flags = !{!1}
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!1 = !{i32 7, !"RtLibUseGOT", i32 1}
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