[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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254737 91177308-0d34-0410-b5e6-96231b3b80d8

docs/BitCodeFormat.rst

@@ -756,6 +756,7 @@ function. The operand fields are:
   * ``anyregcc``: code 13
   * ``preserve_mostcc``: code 14
   * ``preserve_allcc``: code 15
+  * ``cxx_fast_tlscc``: code 17
   * ``x86_stdcallcc``: code 64
   * ``x86_fastcallcc``: code 65
   * ``arm_apcscc``: code 66

docs/LangRef.rst

@@ -406,6 +406,16 @@ added in the future:
     This calling convention, like the `PreserveMost` calling convention, will be
     used by a future version of the ObjectiveC runtime and should be considered
     experimental at this time.
+"``cxx_fast_tlscc``" - The `CXX_FAST_TLS` calling convention for access functions
+    This calling convention aims to minimize overhead in the caller by
+    preserving as many registers as possible. This calling convention behaves
+    identical to the `C` calling convention on how arguments and return values
+    are passed, but it uses a different set of caller/callee-saved registers.
+    Given that C-style TLS on Darwin has its own special CSRs, we can't use the
+    existing `PreserveMost`.
+
+    - On X86-64 the callee preserves all general purpose registers, except for
+      RDI and RAX.
 "``cc <n>``" - Numbered convention
     Any calling convention may be specified by number, allowing
     target-specific calling conventions to be used. Target specific

include/llvm/IR/CallingConv.h

@@ -72,6 +72,9 @@ namespace CallingConv {
     // Swift - Calling convention for Swift.
     Swift = 16,
 
+    // CXX_FAST_TLS - Calling convention for access functions.
+    CXX_FAST_TLS = 17,
+
     // Target - This is the start of the target-specific calling conventions,
     // e.g. fastcall and thiscall on X86.
     FirstTargetCC = 64,

lib/AsmParser/LLLexer.cpp

@@ -591,6 +591,7 @@ lltok::Kind LLLexer::LexIdentifier() {
   KEYWORD(ghccc);
   KEYWORD(hhvmcc);
   KEYWORD(hhvm_ccc);
+  KEYWORD(cxx_fast_tlscc);
 
   KEYWORD(cc);
   KEYWORD(c);

lib/AsmParser/LLParser.cpp

@@ -1544,6 +1544,7 @@ bool LLParser::ParseOptionalDLLStorageClass(unsigned &Res) {
 ///   ::= 'ghccc'
 ///   ::= 'hhvmcc'
 ///   ::= 'hhvm_ccc'
+///   ::= 'cxx_fast_tlscc'
 ///   ::= 'cc' UINT
 ///
 bool LLParser::ParseOptionalCallingConv(unsigned &CC) {
@@ -1574,6 +1575,7 @@ bool LLParser::ParseOptionalCallingConv(unsigned &CC) {
   case lltok::kw_ghccc:          CC = CallingConv::GHC; break;
   case lltok::kw_hhvmcc:         CC = CallingConv::HHVM; break;
   case lltok::kw_hhvm_ccc:       CC = CallingConv::HHVM_C; break;
+  case lltok::kw_cxx_fast_tlscc: CC = CallingConv::CXX_FAST_TLS; break;
   case lltok::kw_cc: {
       Lex.Lex();
       return ParseUInt32(CC);

lib/AsmParser/LLToken.h

@@ -99,6 +99,7 @@ namespace lltok {
     kw_preserve_mostcc, kw_preserve_allcc,
     kw_ghccc,
     kw_hhvmcc, kw_hhvm_ccc,
+    kw_cxx_fast_tlscc,
 
     // Attributes:
     kw_attributes,

lib/IR/AsmWriter.cpp

@@ -304,6 +304,7 @@ static void PrintCallingConv(unsigned cc, raw_ostream &Out) {
   case CallingConv::AnyReg:        Out << "anyregcc"; break;
   case CallingConv::PreserveMost:  Out << "preserve_mostcc"; break;
   case CallingConv::PreserveAll:   Out << "preserve_allcc"; break;
+  case CallingConv::CXX_FAST_TLS:  Out << "cxx_fast_tlscc"; break;
   case CallingConv::GHC:           Out << "ghccc"; break;
   case CallingConv::X86_StdCall:   Out << "x86_stdcallcc"; break;
   case CallingConv::X86_FastCall:  Out << "x86_fastcallcc"; break;

lib/Target/X86/X86RegisterInfo.cpp

@@ -248,6 +248,10 @@ X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
     if (HasAVX)
       return CSR_64_RT_AllRegs_AVX_SaveList;
     return CSR_64_RT_AllRegs_SaveList;
+  case CallingConv::CXX_FAST_TLS:
+    if (Is64Bit)
+      return CSR_64_TLS_Darwin_SaveList;
+    break;
   case CallingConv::Intel_OCL_BI: {
     if (HasAVX512 && IsWin64)
       return CSR_Win64_Intel_OCL_BI_AVX512_SaveList;
@@ -310,6 +314,10 @@ X86RegisterInfo::getCallPreservedMask(const MachineFunction &MF,
     if (HasAVX)
       return CSR_64_RT_AllRegs_AVX_RegMask;
     return CSR_64_RT_AllRegs_RegMask;
+  case CallingConv::CXX_FAST_TLS:
+    if (Is64Bit)
+      return CSR_64_TLS_Darwin_RegMask;
+    break;
   case CallingConv::Intel_OCL_BI: {
     if (HasAVX512 && IsWin64)
       return CSR_Win64_Intel_OCL_BI_AVX512_RegMask;

test/CodeGen/X86/cxx_tlscc64.ll

@@ -0,0 +1,71 @@
+; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
+; RUN: llc < %s -mtriple=x86_64-apple-darwin -enable-shrink-wrap=true | FileCheck --check-prefix=SHRINK %s
+%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
+}