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.
101 lines
3.6 KiB
LLVM
101 lines
3.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -show-mc-encoding | FileCheck %s --check-prefix=NOPIC
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; RUN: llc -relocation-model=pic -show-mc-encoding < %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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@cmp8 = external hidden global i8, !absolute_symbol !0
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@cmp32 = external hidden global i8, !absolute_symbol !1
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declare void @f()
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define void @foo8(i64 %val) {
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; NOPIC-LABEL: foo8:
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; NOPIC: # %bb.0:
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; NOPIC-NEXT: cmpq $cmp8@ABS8, %rdi # encoding: [0x48,0x83,0xff,A]
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; NOPIC-NEXT: # fixup A - offset: 3, value: cmp8@ABS8, kind: FK_Data_1
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; NOPIC-NEXT: ja .LBB0_2 # encoding: [0x77,A]
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; NOPIC-NEXT: # fixup A - offset: 1, value: .LBB0_2-1, kind: FK_PCRel_1
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; NOPIC-NEXT: # %bb.1: # %t
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; NOPIC-NEXT: pushq %rax # encoding: [0x50]
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; NOPIC-NEXT: .cfi_def_cfa_offset 16
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; NOPIC-NEXT: callq f@PLT # encoding: [0xe8,A,A,A,A]
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; NOPIC-NEXT: # fixup A - offset: 1, value: f@PLT-4, kind: FK_PCRel_4
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; NOPIC-NEXT: popq %rax # encoding: [0x58]
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; NOPIC-NEXT: .cfi_def_cfa_offset 8
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; NOPIC-NEXT: .LBB0_2: # %f
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; NOPIC-NEXT: retq # encoding: [0xc3]
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;
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; PIC-LABEL: foo8:
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; PIC: # %bb.0:
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; PIC-NEXT: cmpq $cmp8@ABS8, %rdi # encoding: [0x48,0x83,0xff,A]
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; PIC-NEXT: # fixup A - offset: 3, value: cmp8@ABS8, kind: FK_Data_1
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; PIC-NEXT: ja .LBB0_2 # encoding: [0x77,A]
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; PIC-NEXT: # fixup A - offset: 1, value: .LBB0_2-1, kind: FK_PCRel_1
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; PIC-NEXT: # %bb.1: # %t
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; PIC-NEXT: pushq %rax # encoding: [0x50]
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; PIC-NEXT: .cfi_def_cfa_offset 16
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; PIC-NEXT: callq f@PLT # encoding: [0xe8,A,A,A,A]
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; PIC-NEXT: # fixup A - offset: 1, value: f@PLT-4, kind: FK_PCRel_4
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; PIC-NEXT: popq %rax # encoding: [0x58]
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; PIC-NEXT: .cfi_def_cfa_offset 8
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; PIC-NEXT: .LBB0_2: # %f
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; PIC-NEXT: retq # encoding: [0xc3]
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%cmp = icmp ule i64 %val, ptrtoint (i8* @cmp8 to i64)
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br i1 %cmp, label %t, label %f
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t:
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call void @f()
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ret void
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f:
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ret void
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}
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define void @foo32(i64 %val) {
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; NOPIC-LABEL: foo32:
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; NOPIC: # %bb.0:
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; NOPIC-NEXT: cmpq $cmp32, %rdi # encoding: [0x48,0x81,0xff,A,A,A,A]
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; NOPIC-NEXT: # fixup A - offset: 3, value: cmp32, kind: reloc_signed_4byte
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; NOPIC-NEXT: ja .LBB1_2 # encoding: [0x77,A]
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; NOPIC-NEXT: # fixup A - offset: 1, value: .LBB1_2-1, kind: FK_PCRel_1
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; NOPIC-NEXT: # %bb.1: # %t
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; NOPIC-NEXT: pushq %rax # encoding: [0x50]
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; NOPIC-NEXT: .cfi_def_cfa_offset 16
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; NOPIC-NEXT: callq f@PLT # encoding: [0xe8,A,A,A,A]
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; NOPIC-NEXT: # fixup A - offset: 1, value: f@PLT-4, kind: FK_PCRel_4
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; NOPIC-NEXT: popq %rax # encoding: [0x58]
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; NOPIC-NEXT: .cfi_def_cfa_offset 8
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; NOPIC-NEXT: .LBB1_2: # %f
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; NOPIC-NEXT: retq # encoding: [0xc3]
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;
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; PIC-LABEL: foo32:
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; PIC: # %bb.0:
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; PIC-NEXT: cmpq $cmp32, %rdi # encoding: [0x48,0x81,0xff,A,A,A,A]
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; PIC-NEXT: # fixup A - offset: 3, value: cmp32, kind: reloc_signed_4byte
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; PIC-NEXT: ja .LBB1_2 # encoding: [0x77,A]
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; PIC-NEXT: # fixup A - offset: 1, value: .LBB1_2-1, kind: FK_PCRel_1
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; PIC-NEXT: # %bb.1: # %t
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; PIC-NEXT: pushq %rax # encoding: [0x50]
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; PIC-NEXT: .cfi_def_cfa_offset 16
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; PIC-NEXT: callq f@PLT # encoding: [0xe8,A,A,A,A]
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; PIC-NEXT: # fixup A - offset: 1, value: f@PLT-4, kind: FK_PCRel_4
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; PIC-NEXT: popq %rax # encoding: [0x58]
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; PIC-NEXT: .cfi_def_cfa_offset 8
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; PIC-NEXT: .LBB1_2: # %f
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; PIC-NEXT: retq # encoding: [0xc3]
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%cmp = icmp ule i64 %val, ptrtoint (i8* @cmp32 to i64)
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br i1 %cmp, label %t, label %f
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t:
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call void @f()
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ret void
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f:
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ret void
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}
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!0 = !{i64 0, i64 128}
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!1 = !{i64 0, i64 2147483648}
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