From acda67c97a58432a188ec293a45710ac53f2525a Mon Sep 17 00:00:00 2001
From: Martin Storsjo <martin@martin.st>
Date: Mon, 4 Dec 2017 09:08:55 +0000
Subject: [PATCH] [ARM] Allow using emulated tls on platforms other than ELF

This matches how it is done on X86.

This allows using emulated tls on windows; in MinGW environments,
native tls isn't supported at the moment.

Differential Revision: https://reviews.llvm.org/D40769

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319643 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMISelLowering.cpp |  8 ++--
 test/CodeGen/ARM/emutls_generic.ll | 75 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+), 4 deletions(-)

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index cee274080b2..d9893db3773 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -2956,6 +2956,10 @@ ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA,
 
 SDValue
 ARMTargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
+  GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
+  if (DAG.getTarget().Options.EmulatedTLS)
+    return LowerToTLSEmulatedModel(GA, DAG);
+
   if (Subtarget->isTargetDarwin())
     return LowerGlobalTLSAddressDarwin(Op, DAG);
 
@@ -2964,10 +2968,6 @@ ARMTargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
 
   // TODO: implement the "local dynamic" model
   assert(Subtarget->isTargetELF() && "Only ELF implemented here");
-  GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
-  if (DAG.getTarget().Options.EmulatedTLS)
-    return LowerToTLSEmulatedModel(GA, DAG);
-
   TLSModel::Model model = getTargetMachine().getTLSModel(GA->getGlobal());
 
   switch (model) {
diff --git a/test/CodeGen/ARM/emutls_generic.ll b/test/CodeGen/ARM/emutls_generic.ll
index f5633dc23bc..8c1c40dd6ea 100644
--- a/test/CodeGen/ARM/emutls_generic.ll
+++ b/test/CodeGen/ARM/emutls_generic.ll
@@ -6,6 +6,10 @@
 ; RUN:     | FileCheck -check-prefix=ARM_32 %s
 ; RUN: llc < %s -emulated-tls -mtriple=arm-linux-androidabi -O3 \
 ; RUN:     | FileCheck -check-prefix=ARM_32 %s
+; RUN: llc < %s -emulated-tls -mtriple=arm-apple-darwin -O3 \
+; RUN:     | FileCheck -check-prefix=DARWIN %s
+; RUN: llc < %s -emulated-tls -mtriple=thumbv7-windows-gnu -O3 \
+; RUN:     | FileCheck -check-prefix=WIN %s
 
 ; Make sure that TLS symbols are emitted in expected order.
 
@@ -61,3 +65,74 @@ entry:
 ; ARM_32-LABEL:  __emutls_t.internal_y:
 ; ARM_32-NEXT:   .long 9
 ; ARM_32-NEXT:   .long 0
+
+; WIN-LABEL:  get_external_x:
+; WIN:        movw r0, :lower16:__emutls_v.external_x
+; WIN:        movt r0, :upper16:__emutls_v.external_x
+; WIN:        bl __emutls_get_address
+; WIN-LABEL:  get_external_y:
+; WIN:        movw r0, :lower16:__emutls_v.external_y
+; WIN:        movt r0, :upper16:__emutls_v.external_y
+; WIN:        bl __emutls_get_address
+; WIN-LABEL:  get_internal_y:
+; WIN:        movw r0, :lower16:__emutls_v.internal_y
+; WIN:        movt r0, :upper16:__emutls_v.internal_y
+; WIN:        bl __emutls_get_address
+; WIN-NOT:    __emutls_t.external_x
+; WIN-NOT:    __emutls_v.external_x:
+; WIN:        .data{{$}}
+; WIN:        .globl __emutls_v.external_y
+; WIN:        .p2align 2
+; WIN-LABEL:  __emutls_v.external_y:
+; WIN-NEXT:   .long 1
+; WIN-NEXT:   .long 2
+; WIN-NEXT:   .long 0
+; WIN-NEXT:   .long __emutls_t.external_y
+; WIN:        .section .rdata,
+; WIN-LABEL:  __emutls_t.external_y:
+; WIN-NEXT:   .byte 7
+; WIN:        .data{{$}}
+; WIN-NOT:    .globl
+; WIN:        .p2align 2
+; WIN-LABEL:  __emutls_v.internal_y:
+; WIN-NEXT:   .long 8
+; WIN-NEXT:   .long 16
+; WIN-NEXT:   .long 0
+; WIN-NEXT:   .long __emutls_t.internal_y
+; WIN-LABEL:  __emutls_t.internal_y:
+; .quad 9 is equivalent to .long 9 .long 0
+; WIN-NEXT:   .quad 9
+
+; DARWIN-LABEL:  _get_external_x:
+; DARWIN:        bl ___emutls_get_address
+; DARWIN:        .long L___emutls_v.external_x$non_lazy_ptr-(LPC0_0+8)
+; DARWIN-LABEL:  _get_external_y:
+; DARWIN:        bl ___emutls_get_address
+; DARWIN:        .long ___emutls_v.external_y-(LPC1_0+8)
+; DARWIN-LABEL:  _get_internal_y:
+; DARWIN:        bl ___emutls_get_address
+; DARWIN:        .long ___emutls_v.internal_y-(LPC2_0+8)
+; DARWIN-NOT:    ___emutls_t.external_x
+; DARWIN-NOT:    ___emutls_v.external_x:
+; DARWIN:        .section __DATA,__data
+; DARWIN:        .globl ___emutls_v.external_y
+; DARWIN:        .p2align 2
+; DARWIN-LABEL:  ___emutls_v.external_y:
+; DARWIN-NEXT:   .long 1
+; DARWIN-NEXT:   .long 2
+; DARWIN-NEXT:   .long 0
+; DARWIN-NEXT:   .long ___emutls_t.external_y
+; DARWIN:        .section __TEXT,__const
+; DARWIN-LABEL:  ___emutls_t.external_y:
+; DARWIN-NEXT:   .byte 7
+; DARWIN:        .section __DATA,__data
+; DARWIN-NOT:    .globl
+; DARWIN:        .p2align 2
+; DARWIN-LABEL:  ___emutls_v.internal_y:
+; DARWIN-NEXT:   .long 8
+; DARWIN-NEXT:   .long 16
+; DARWIN-NEXT:   .long 0
+; DARWIN-NEXT:   .long ___emutls_t.internal_y
+; DARWIN-LABEL:  ___emutls_t.internal_y:
+; DARWIN-NEXT:   .long 9
+; DARWIN-NEXT:   .long 0
-- 
2.11.4.GIT