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.
107 lines
3.2 KiB
LLVM
107 lines
3.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i686-- -tailcallopt | FileCheck %s
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; With -tailcallopt, CodeGen guarantees a tail call optimization
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; for all of these.
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declare fastcc i32 @tailcallee(i32 %a1, i32 %a2, i32 %a3, i32 %a4)
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define fastcc i32 @tailcaller(i32 %in1, i32 %in2) nounwind {
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; CHECK-LABEL: tailcaller:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: subl $16, %esp
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; CHECK-NEXT: movl %ecx, {{[0-9]+}}(%esp)
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: movl %edx, {{[0-9]+}}(%esp)
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; CHECK-NEXT: movl %eax, {{[0-9]+}}(%esp)
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; CHECK-NEXT: addl $8, %esp
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; CHECK-NEXT: jmp tailcallee@PLT # TAILCALL
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entry:
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%tmp11 = tail call fastcc i32 @tailcallee(i32 %in1, i32 %in2, i32 %in1, i32 %in2)
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ret i32 %tmp11
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}
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declare fastcc i8* @alias_callee()
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define fastcc noalias i8* @noalias_caller() nounwind {
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; CHECK-LABEL: noalias_caller:
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; CHECK: # %bb.0:
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; CHECK-NEXT: jmp alias_callee@PLT # TAILCALL
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%p = tail call fastcc i8* @alias_callee()
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ret i8* %p
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}
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declare fastcc noalias i8* @noalias_callee()
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define fastcc i8* @alias_caller() nounwind {
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; CHECK-LABEL: alias_caller:
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; CHECK: # %bb.0:
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; CHECK-NEXT: jmp noalias_callee@PLT # TAILCALL
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%p = tail call fastcc noalias i8* @noalias_callee()
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ret i8* %p
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}
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declare fastcc i32 @i32_callee()
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define fastcc i32 @ret_undef() nounwind {
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; CHECK-LABEL: ret_undef:
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; CHECK: # %bb.0:
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; CHECK-NEXT: jmp i32_callee@PLT # TAILCALL
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%p = tail call fastcc i32 @i32_callee()
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ret i32 undef
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}
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declare fastcc void @does_not_return()
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define fastcc i32 @noret() nounwind {
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; CHECK-LABEL: noret:
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; CHECK: # %bb.0:
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; CHECK-NEXT: jmp does_not_return@PLT # TAILCALL
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tail call fastcc void @does_not_return()
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unreachable
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}
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define fastcc void @void_test(i32, i32, i32, i32) {
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; CHECK-LABEL: void_test:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: pushl %esi
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: subl $8, %esp
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: .cfi_offset %esi, -8
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %esi
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; CHECK-NEXT: movl %esi, {{[0-9]+}}(%esp)
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; CHECK-NEXT: movl %eax, {{[0-9]+}}(%esp)
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; CHECK-NEXT: addl $8, %esp
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: popl %esi
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; CHECK-NEXT: .cfi_def_cfa_offset 4
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; CHECK-NEXT: jmp void_test # TAILCALL
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entry:
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tail call fastcc void @void_test( i32 %0, i32 %1, i32 %2, i32 %3)
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ret void
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}
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define fastcc i1 @i1test(i32, i32, i32, i32) {
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; CHECK-LABEL: i1test:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: pushl %esi
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: subl $8, %esp
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: .cfi_offset %esi, -8
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %esi
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; CHECK-NEXT: movl %esi, {{[0-9]+}}(%esp)
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; CHECK-NEXT: movl %eax, {{[0-9]+}}(%esp)
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; CHECK-NEXT: addl $8, %esp
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: popl %esi
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; CHECK-NEXT: .cfi_def_cfa_offset 4
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; CHECK-NEXT: jmp i1test # TAILCALL
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entry:
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%4 = tail call fastcc i1 @i1test( i32 %0, i32 %1, i32 %2, i32 %3)
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ret i1 %4
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}
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