a084c0388e
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.
48 lines
1.3 KiB
LLVM
48 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s | FileCheck %s
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; RUN: llc -relocation-model=pic < %s | FileCheck %s --check-prefix=PIC
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@foo = external global i8, align 1, !absolute_symbol !0
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define void @bar(i8* %x) {
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; CHECK-LABEL: bar:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: testb $foo, (%rdi)
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; CHECK-NEXT: je .LBB0_1
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; CHECK-NEXT: # %bb.2: # %if.then
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: jmp xf@PLT # TAILCALL
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; CHECK-NEXT: .LBB0_1: # %if.end
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; CHECK-NEXT: retq
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;
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; PIC-LABEL: bar:
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; PIC: # %bb.0: # %entry
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; PIC-NEXT: testb $foo, (%rdi)
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; PIC-NEXT: je .LBB0_1
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; PIC-NEXT: # %bb.2: # %if.then
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; PIC-NEXT: xorl %eax, %eax
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; PIC-NEXT: jmp xf@PLT # TAILCALL
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; PIC-NEXT: .LBB0_1: # %if.end
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; PIC-NEXT: retq
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entry:
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%0 = load i8, i8* %x, align 1
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%conv = sext i8 %0 to i32
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%and = and i32 %conv, sext (i8 ptrtoint (i8* @foo to i8) to i32)
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%tobool = icmp eq i32 %and, 0
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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tail call void (...) @xf()
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br label %if.end
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if.end: ; preds = %entry, %if.then
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ret void
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}
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declare void @xf(...)
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!0 = !{i32 0, i32 256}
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