Index: include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
===================================================================
--- include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
+++ include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
@@ -134,6 +134,8 @@
 class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
   mutable unsigned NextUniqueID = 0;
 
+  Triple TT;
+
 public:
   ~TargetLoweringObjectFileCOFF() override = default;
 
Index: lib/CodeGen/TargetLoweringObjectFileImpl.cpp
===================================================================
--- lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -1237,6 +1237,7 @@
                       COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
         SectionKind::getData());
   }
+  TT = T;
 }
 
 static MCSectionCOFF *getCOFFStaticStructorSection(MCContext &Ctx,
@@ -1350,6 +1351,11 @@
 MCSection *TargetLoweringObjectFileCOFF::getSectionForConstant(
     const DataLayout &DL, SectionKind Kind, const Constant *C,
     unsigned &Align) const {
+  if (!TT.isKnownWindowsMSVCEnvironment() &&
+      !TT.isWindowsItaniumEnvironment() &&
+      !TT.isWindowsCoreCLREnvironment())
+    return TargetLoweringObjectFile::getSectionForConstant(DL, Kind, C, Align);
+
   if (Kind.isMergeableConst() && C) {
     const unsigned Characteristics = COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
                                      COFF::IMAGE_SCN_MEM_READ |
Index: test/CodeGen/X86/win_cst_pool.ll
===================================================================
--- test/CodeGen/X86/win_cst_pool.ll
+++ test/CodeGen/X86/win_cst_pool.ll
@@ -1,4 +1,5 @@
 ; RUN: llc < %s -mtriple=x86_64-win32 -mattr=sse2 -mattr=avx | FileCheck %s
+; RUN: llc < %s -mtriple=x86_64-win32-gnu -mattr=sse2 -mattr=avx | FileCheck -check-prefix=MINGW %s
 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-pc-windows-msvc"
 
@@ -14,6 +15,14 @@
 ; CHECK:               movsd   __real@0000000000800000(%rip), %xmm0
 ; CHECK-NEXT:          ret
 
+; MINGW:              .section        .rdata,"dr"
+; MINGW-NEXT:         .p2align  3
+; MINGW-NEXT: [[LABEL:\.LC.*]]:
+; MINGW-NEXT:         .quad   8388608
+; MINGW:      double:
+; MINGW:               movsd   [[LABEL]](%rip), %xmm0
+; MINGW-NEXT:          ret
+
 define <4 x i32> @vec1() {
   ret <4 x i32> <i32 3, i32 2, i32 1, i32 0>
 }