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llvm-project/llvm/test/CodeGen/X86/cxx_tlscc64.ll

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[CXX TLS calling convention] Add CXX TLS calling convention. This commit adds a new target-independent calling convention for C++ TLS access functions. It aims to minimize overhead in the caller by perserving as many registers as possible. The target-specific implementation for X86-64 is defined as following: Arguments are passed as for the default C calling convention The same applies for the return value(s) The callee preserves all GPRs - except RAX and RDI The access function makes C-style TLS function calls in the entry and exit block, C-style TLS functions save a lot more registers than normal calls. The added calling convention ties into the existing implementation of the C-style TLS functions, so we can't simply use existing calling conventions such as preserve_mostcc. rdar://9001553 llvm-svn: 254737
2015-12-05 01:40:13 +08:00
; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
[X86] Correctly model TLS calls w.r.t. frame requirements. TLS calls need the stack frame to be properly set up and this implies that such calls need ADJUSTSTACK_xxx markers. Fixes PR25820. llvm-svn: 256959
2016-01-07 03:09:26 +08:00
; TLS function were wrongly model and after fixing that, shrink-wrapping
; cannot help here. To achieve the expected lowering, we need to playing
; tricks similar to AArch64 fast TLS calling convention (r255821).
; Re-enable the following run line when
; _RUN_: llc < %s -mtriple=x86_64-apple-darwin -enable-shrink-wrap=true | FileCheck --check-prefix=SHRINK %s
[CXX TLS calling convention] Add CXX TLS calling convention. This commit adds a new target-independent calling convention for C++ TLS access functions. It aims to minimize overhead in the caller by perserving as many registers as possible. The target-specific implementation for X86-64 is defined as following: Arguments are passed as for the default C calling convention The same applies for the return value(s) The callee preserves all GPRs - except RAX and RDI The access function makes C-style TLS function calls in the entry and exit block, C-style TLS functions save a lot more registers than normal calls. The added calling convention ties into the existing implementation of the C-style TLS functions, so we can't simply use existing calling conventions such as preserve_mostcc. rdar://9001553 llvm-svn: 254737
2015-12-05 01:40:13 +08:00
%struct.S = type { i8 }
@sg = internal thread_local global %struct.S zeroinitializer, align 1
@__dso_handle = external global i8
@__tls_guard = internal thread_local unnamed_addr global i1 false
declare void @_ZN1SC1Ev(%struct.S*)
declare void @_ZN1SD1Ev(%struct.S*)
declare i32 @_tlv_atexit(void (i8*)*, i8*, i8*)
; Every GPR should be saved - except rdi, rax, and rsp
; CHECK-LABEL: _ZTW2sg
; CHECK: pushq %r11
; CHECK: pushq %r10
; CHECK: pushq %r9
; CHECK: pushq %r8
; CHECK: pushq %rsi
; CHECK: pushq %rdx
; CHECK: pushq %rcx
; CHECK: pushq %rbx
; CHECK: callq
; CHECK: jne
; CHECK: callq
; CHECK: tlv_atexit
; CHECK: callq
; CHECK: popq %rbx
; CHECK: popq %rcx
; CHECK: popq %rdx
; CHECK: popq %rsi
; CHECK: popq %r8
; CHECK: popq %r9
; CHECK: popq %r10
; CHECK: popq %r11
; SHRINK-LABEL: _ZTW2sg
; SHRINK: callq
; SHRINK: jne
; SHRINK: pushq %r11
; SHRINK: pushq %r10
; SHRINK: pushq %r9
; SHRINK: pushq %r8
; SHRINK: pushq %rsi
; SHRINK: pushq %rdx
; SHRINK: pushq %rcx
; SHRINK: pushq %rbx
; SHRINK: callq
; SHRINK: tlv_atexit
; SHRINK: popq %rbx
; SHRINK: popq %rcx
; SHRINK: popq %rdx
; SHRINK: popq %rsi
; SHRINK: popq %r8
; SHRINK: popq %r9
; SHRINK: popq %r10
; SHRINK: popq %r11
; SHRINK: LBB{{.*}}:
; SHRINK: callq
define cxx_fast_tlscc nonnull %struct.S* @_ZTW2sg() {
%.b.i = load i1, i1* @__tls_guard, align 1
br i1 %.b.i, label %__tls_init.exit, label %init.i
init.i:
store i1 true, i1* @__tls_guard, align 1
tail call void @_ZN1SC1Ev(%struct.S* nonnull @sg) #2
%1 = tail call i32 @_tlv_atexit(void (i8*)* nonnull bitcast (void (%struct.S*)* @_ZN1SD1Ev to void (i8*)*), i8* nonnull getelementptr inbounds (%struct.S, %struct.S* @sg, i64 0, i32 0), i8* nonnull @__dso_handle) #2
br label %__tls_init.exit
__tls_init.exit:
ret %struct.S* @sg
}