[llvm] [Cygwin] Cygwin X86ISelDAGToDAG.cpp (PR #76883)

[徐持恒 Xu Chiheng via llvm-commits]

https://github.com/xu-chiheng created https://github.com/llvm/llvm-project/pull/76883

Fix the regression caused by commit 2366d53d8d8726b73408597b534d2f910c3d3e6d 2023-12-22, that, in Cygwin, Clang can't bootstrap.
CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o:ItaniumDemangle.cpp:(.text+0xb9b): relocation truncated to fit: IMAGE_REL_AMD64_ADDR32 against `.rdata'
CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o:ItaniumDemangle.cpp:(.text+0xba2): relocation truncated to fit: IMAGE_REL_AMD64_ADDR32 against `.rdata'
CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o:ItaniumDemangle.cpp:(.text+0x126c): relocation truncated to fit: IMAGE_REL_AMD64_ADDR32 against `.rdata'
CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o:ItaniumDemangle.cpp:(.text+0x1273): relocation truncated to fit: IMAGE_REL_AMD64_ADDR32 against `.rdata'
CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o:ItaniumDemangle.cpp:(.text+0x1377): relocation truncated to fit: IMAGE_REL_AMD64_ADDR32 against `.rdata'
CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o:ItaniumDemangle.cpp:(.text+0x137e): relocation truncated to fit: IMAGE_REL_AMD64_ADDR32 against `.rdata'
CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o:ItaniumDemangle.cpp:(.text+0x1f32): relocation truncated to fit: IMAGE_REL_AMD64_ADDR32 against `.rdata'
CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o:ItaniumDemangle.cpp:(.text+0x1f39): relocation truncated to fit: IMAGE_REL_AMD64_ADDR32 against `.rdata'
CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o:ItaniumDemangle.cpp:(.text+0x2b76): relocation truncated to fit: IMAGE_REL_AMD64_ADDR32 against `.rdata'
CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o:ItaniumDemangle.cpp:(.text+0x2b7d): relocation truncated to fit: IMAGE_REL_AMD64_ADDR32 against `.rdata'
CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o:ItaniumDemangle.cpp:(.text+0x399e): additional relocation overflows omitted from the output
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [lib/Demangle/CMakeFiles/LLVMDemangle.dir/build.make:177: bin/cygLLVMDemangle-18git.dll] Error 1
make[2]: Leaving directory '/cygdrive/e/Note/Tool/llvm-release-build'
make[1]: *** [CMakeFiles/Makefile2:10800: lib/Demangle/CMakeFiles/LLVMDemangle.dir/all] Error 2
make[2]: Leaving directory '/cygdrive/e/Note/Tool/llvm-release-build'
[  3%] Built target obj.LLVMTableGenCommon
make[2]: Leaving directory '/cygdrive/e/Note/Tool/llvm-release-build'
[  3%] Built target obj.LLVMCFIVerify
make[1]: Leaving directory '/cygdrive/e/Note/Tool/llvm-release-build'
make: *** [Makefile:156: all] Error 2


>From e56b6f7601c2f9056339d6c4d878cbba2eeb4631 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BE=90=E6=8C=81=E6=81=92=20Xu=20Chiheng?=
 <chiheng.xu at gmail.com>
Date: Thu, 4 Jan 2024 09:15:08 +0800
Subject: [PATCH] 1

---
 llvm/lib/Target/X86/X86ISelDAGToDAG.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
index 77a997588c4fee..7277baa509a0e7 100644
--- a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -1828,7 +1828,9 @@ bool X86DAGToDAGISel::matchWrapper(SDValue N, X86ISelAddressMode &AM) {
   // That signifies access to globals that are known to be "near",
   // such as the GOT itself.
   CodeModel::Model M = TM.getCodeModel();
-  if (Subtarget->is64Bit() && M == CodeModel::Large && !IsRIPRelTLS)
+  if (Subtarget->is64Bit() &&
+      ((M == CodeModel::Large && !IsRIPRelTLS) ||
+       (M == CodeModel::Medium && !IsRIPRel)))
     return true;
 
   // Base and index reg must be 0 in order to use %rip as base.