[llvm] [Cygwin] Cygwin cmodel medium for 64 bit (PR #74931)

[徐持恒 Xu Chiheng via llvm-commits]

https://github.com/xu-chiheng updated https://github.com/llvm/llvm-project/pull/74931

>From 3eedb06a123b1a686d560c79d6fc16ce570d0697 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: Mon, 1 Jan 2024 06:08:13 +0800
Subject: [PATCH] 1

---
 llvm/lib/Target/X86/X86TargetMachine.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/llvm/lib/Target/X86/X86TargetMachine.cpp b/llvm/lib/Target/X86/X86TargetMachine.cpp
index 5668b514d6dec0..4e157cf9d5bcd1 100644
--- a/llvm/lib/Target/X86/X86TargetMachine.cpp
+++ b/llvm/lib/Target/X86/X86TargetMachine.cpp
@@ -218,6 +218,22 @@ getEffectiveX86CodeModel(std::optional<CodeModel::Model> CM, bool JIT,
   return CodeModel::Small;
 }
 
+static CodeModel::Model
+getEffectiveX86CodeModel(const Triple &TT, std::optional<CodeModel::Model> CM,
+                         bool JIT) {
+  bool Is64Bit = TT.getArch() == Triple::x86_64;
+  if (CM) {
+    if (*CM == CodeModel::Tiny)
+      report_fatal_error("Target does not support the tiny CodeModel", false);
+    return *CM;
+  }
+  if (JIT)
+    return Is64Bit ? CodeModel::Large : CodeModel::Small;
+  if (TT.isWindowsCygwinEnvironment())
+    return Is64Bit ? CodeModel::Medium : CodeModel::Small;
+  return CodeModel::Small;
+}
+
 /// Create an X86 target.
 ///
 X86TargetMachine::X86TargetMachine(const Target &T, const Triple &TT,