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Add llvm and clang patches corresponding to r277774 and r277775.

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This commit is contained in:
Dimitry Andric 2015-01-26 21:24:04 +00:00
parent fce16cf29f
commit 09e84db383
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=277776
2 changed files with 137 additions and 0 deletions
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83
contrib/llvm/patches/patch-29-llvm-r226664-aarch64-x18.diff Normal file
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@ -0,0 +1,83 @@
Pull in r226664 from upstream llvm trunk (by Tim Northover):
AArch64: add backend option to reserve x18 (platform register)
AAPCS64 says that it's up to the platform to specify whether x18 is
reserved, and a first step on that way is to add a flag controlling
it.
From: Andrew Turner <andrew@fubar.geek.nz>
Introduced here: http://svnweb.freebsd.org/changeset/base/277774
Index: lib/Target/AArch64/AArch64RegisterInfo.cpp
===================================================================
--- lib/Target/AArch64/AArch64RegisterInfo.cpp
+++ lib/Target/AArch64/AArch64RegisterInfo.cpp
@@ -33,6 +33,10 @@ using namespace llvm;
#define GET_REGINFO_TARGET_DESC
#include "AArch64GenRegisterInfo.inc"
+static cl::opt<bool>
+ReserveX18("aarch64-reserve-x18", cl::Hidden,
+ cl::desc("Reserve X18, making it unavailable as GPR"));
+
AArch64RegisterInfo::AArch64RegisterInfo(const AArch64InstrInfo *tii,
const AArch64Subtarget *sti)
: AArch64GenRegisterInfo(AArch64::LR), TII(tii), STI(sti) {}
@@ -90,7 +94,7 @@ AArch64RegisterInfo::getReservedRegs(const Machine
Reserved.set(AArch64::W29);
}
- if (STI->isTargetDarwin()) {
+ if (STI->isTargetDarwin() || ReserveX18) {
Reserved.set(AArch64::X18); // Platform register
Reserved.set(AArch64::W18);
}
@@ -117,7 +121,7 @@ bool AArch64RegisterInfo::isReservedReg(const Mach
return true;
case AArch64::X18:
case AArch64::W18:
- return STI->isTargetDarwin();
+ return STI->isTargetDarwin() || ReserveX18;
case AArch64::FP:
case AArch64::W29:
return TFI->hasFP(MF) || STI->isTargetDarwin();
@@ -379,7 +383,7 @@ unsigned AArch64RegisterInfo::getRegPressureLimit(
case AArch64::GPR64commonRegClassID:
return 32 - 1 // XZR/SP
- (TFI->hasFP(MF) || STI->isTargetDarwin()) // FP
- - STI->isTargetDarwin() // X18 reserved as platform register
+ - (STI->isTargetDarwin() || ReserveX18) // X18 reserved as platform register
- hasBasePointer(MF); // X19
case AArch64::FPR8RegClassID:
case AArch64::FPR16RegClassID:
Index: test/CodeGen/AArch64/arm64-platform-reg.ll
===================================================================
--- test/CodeGen/AArch64/arm64-platform-reg.ll
+++ test/CodeGen/AArch64/arm64-platform-reg.ll
@@ -1,4 +1,5 @@
-; RUN: llc -mtriple=arm64-apple-ios -o - %s | FileCheck %s --check-prefix=CHECK-DARWIN
+; RUN: llc -mtriple=arm64-apple-ios -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE-X18
+; RUN: llc -mtriple=arm64-freebsd-gnu -aarch64-reserve-x18 -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE-X18
; RUN: llc -mtriple=arm64-linux-gnu -o - %s | FileCheck %s
; x18 is reserved as a platform register on Darwin but not on other
@@ -16,11 +17,11 @@ define void @keep_live() {
; CHECK: ldr x18
; CHECK: str x18
-; CHECK-DARWIN-NOT: ldr fp
-; CHECK-DARWIN-NOT: ldr x18
-; CHECK-DARWIN: Spill
-; CHECK-DARWIN-NOT: ldr fp
-; CHECK-DARWIN-NOT: ldr x18
-; CHECK-DARWIN: ret
+; CHECK-RESERVE-X18-NOT: ldr fp
+; CHECK-RESERVE-X18-NOT: ldr x18
+; CHECK-RESERVE-X18: Spill
+; CHECK-RESERVE-X18-NOT: ldr fp
+; CHECK-RESERVE-X18-NOT: ldr x18
+; CHECK-RESERVE-X18: ret
ret void
}

54
contrib/llvm/patches/patch-30-clang-r227062-fixes-x18.diff Normal file
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@ -0,0 +1,54 @@
Pull in r227062 from upstream clang trunk (by Renato Golin):
Allows Clang to use LLVM's fixes-x18 option
This patch allows clang to have llvm reserve the x18
platform register on AArch64. FreeBSD will use this in the kernel for
per-cpu data but has no need to reserve this register in userland so
will need this flag to reserve it.
This uses llvm r226664 to allow this register to be reserved.
Patch by Andrew Turner.
Introduced here: http://svnweb.freebsd.org/changeset/base/277775
Index: tools/clang/include/clang/Driver/Options.td
===================================================================
--- tools/clang/include/clang/Driver/Options.td
+++ tools/clang/include/clang/Driver/Options.td
@@ -1141,6 +1141,9 @@ def mno_long_calls : Flag<["-"], "mno-long-calls">
def mgeneral_regs_only : Flag<["-"], "mgeneral-regs-only">, Group<m_aarch64_Features_Group>,
HelpText<"Generate code which only uses the general purpose registers (AArch64 only)">;
+def ffixed_x18 : Flag<["-"], "ffixed-x18">, Group<m_aarch64_Features_Group>,
+ HelpText<"Reserve the x18 register (AArch64 only)">;
+
def mvsx : Flag<["-"], "mvsx">, Group<m_ppc_Features_Group>;
def mno_vsx : Flag<["-"], "mno-vsx">, Group<m_ppc_Features_Group>;
def mfprnd : Flag<["-"], "mfprnd">, Group<m_ppc_Features_Group>;
Index: tools/clang/lib/Driver/Tools.cpp
===================================================================
--- tools/clang/lib/Driver/Tools.cpp
+++ tools/clang/lib/Driver/Tools.cpp
@@ -887,6 +887,11 @@ void Clang::AddAArch64TargetArgs(const ArgList &Ar
if (A->getOption().matches(options::OPT_mno_global_merge))
CmdArgs.push_back("-mno-global-merge");
}
+
+ if (Args.hasArg(options::OPT_ffixed_x18)) {
+ CmdArgs.push_back("-backend-option");
+ CmdArgs.push_back("-aarch64-reserve-x18");
+ }
}
// Get CPU and ABI names. They are not independent
Index: tools/clang/test/Driver/aarch64-fixed-x18.c
===================================================================
--- tools/clang/test/Driver/aarch64-fixed-x18.c
+++ tools/clang/test/Driver/aarch64-fixed-x18.c
@@ -0,0 +1,4 @@
+// RUN: %clang -target aarch64-none-gnu -ffixed-x18 -### %s 2> %t
+// RUN: FileCheck --check-prefix=CHECK-FIXED-X18 < %t %s
+
+// CHECK-FIXED-X18: "-backend-option" "-aarch64-reserve-x18"