From: Mandeep Singh Grang <mgrang@codeaurora.org>
Date: Tue, 18 Jul 2017 20:41:33 +0000 (+0000)
Subject: [COFF, ARM64] Reserve X18 register by default
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5f77a96905bcd83e103dee22b574edbda46b62a0;p=llvm

[COFF, ARM64] Reserve X18 register by default

Reviewers: compnerd, rnk, ruiu, mstorsjo

Reviewed By: mstorsjo

Subscribers: aemerson, javed.absar, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D35531

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308358 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/AArch64/AArch64Subtarget.cpp b/lib/Target/AArch64/AArch64Subtarget.cpp
index 0ae20edda56..ea611245273 100644
--- a/lib/Target/AArch64/AArch64Subtarget.cpp
+++ b/lib/Target/AArch64/AArch64Subtarget.cpp
@@ -173,7 +173,8 @@ struct AArch64GISelActualAccessor : public GISelAccessor {
 AArch64Subtarget::AArch64Subtarget(const Triple &TT, const std::string &CPU,
                                    const std::string &FS,
                                    const TargetMachine &TM, bool LittleEndian)
-    : AArch64GenSubtargetInfo(TT, CPU, FS), ReserveX18(TT.isOSDarwin()),
+    : AArch64GenSubtargetInfo(TT, CPU, FS),
+      ReserveX18(TT.isOSDarwin() || TT.isOSWindows()),
       IsLittle(LittleEndian), TargetTriple(TT), FrameLowering(),
       InstrInfo(initializeSubtargetDependencies(FS, CPU)), TSInfo(),
       TLInfo(TM, *this), GISel() {
diff --git a/test/CodeGen/AArch64/arm64-platform-reg.ll b/test/CodeGen/AArch64/arm64-platform-reg.ll
index f3af01a7355..9b5d8a890fa 100644
--- a/test/CodeGen/AArch64/arm64-platform-reg.ll
+++ b/test/CodeGen/AArch64/arm64-platform-reg.ll
@@ -1,6 +1,7 @@
 ; RUN: llc -mtriple=arm64-apple-ios -mattr=+reserve-x18 -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE-X18
 ; RUN: llc -mtriple=arm64-freebsd-gnu -mattr=+reserve-x18 -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE-X18
 ; RUN: llc -mtriple=arm64-linux-gnu -o - %s | FileCheck %s
+; RUN: llc -mtriple=aarch64-windows -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE-X18
 
 ; x18 is reserved as a platform register on Darwin but not on other
 ; systems. Create loads of register pressure and make sure this is respected.