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[ARM] Define a subtarget feature and use it to decide whether long calls should

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be emitted.

This is needed to enable ARM long calls for LTO and enable and disable it on a
per-function basis.

Out-of-tree projects currently using EnableARMLongCalls to emit long calls
should start passing "+long-calls" to the feature string (see the changes made
to clang in r241565).

rdar://problem/21529937

Differential Revision: http://reviews.llvm.org/D9364


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241566 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2015-07-07 06:54:42 +00:00
parent 6304789dde
commit a744879a65
10 changed files with 63 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/Target/ARM/ARM.td
View File

@ -150,6 +150,10 @@ def FeatureAClass : SubtargetFeature<"aclass", "ARMProcClass", "AClass",
def FeatureNaClTrap : SubtargetFeature<"nacl-trap", "UseNaClTrap", "true",
"NaCl trap">;
def FeatureLongCalls : SubtargetFeature<"long-calls", "GenLongCalls", "true",
"Generate calls via indirect call "
"instructions">;
// ARM ISAs.
def HasV4TOps : SubtargetFeature<"v4t", "HasV4TOps", "true",
"Support ARM v4T instructions">;

10
lib/Target/ARM/ARMFastISel.cpp
View File

@ -49,8 +49,6 @@
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
extern cl::opt<bool> EnableARMLongCalls;
namespace {
// All possible address modes, plus some.
@ -2246,19 +2244,19 @@ bool ARMFastISel::ARMEmitLibcall(const Instruction *I, RTLIB::Libcall Call) {
return false;
unsigned CalleeReg = 0;
if (EnableARMLongCalls) {
if (Subtarget->genLongCalls()) {
CalleeReg = getLibcallReg(TLI.getLibcallName(Call));
if (CalleeReg == 0) return false;
}
// Issue the call.
unsigned CallOpc = ARMSelectCallOp(EnableARMLongCalls);
unsigned CallOpc = ARMSelectCallOp(Subtarget->genLongCalls());
MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt,
DbgLoc, TII.get(CallOpc));
// BL / BLX don't take a predicate, but tBL / tBLX do.
if (isThumb2)
AddDefaultPred(MIB);
if (EnableARMLongCalls)
if (Subtarget->genLongCalls())
MIB.addReg(CalleeReg);
else
MIB.addExternalSymbol(TLI.getLibcallName(Call));
@ -2380,7 +2378,7 @@ bool ARMFastISel::SelectCall(const Instruction *I,
bool UseReg = false;
const GlobalValue *GV = dyn_cast<GlobalValue>(Callee);
if (!GV || EnableARMLongCalls) UseReg = true;
if (!GV || Subtarget->genLongCalls()) UseReg = true;
unsigned CalleeReg = 0;
if (UseReg) {

7
lib/Target/ARM/ARMISelLowering.cpp
View File

@ -60,11 +60,6 @@ STATISTIC(NumTailCalls, "Number of tail calls");
STATISTIC(NumMovwMovt, "Number of GAs materialized with movw + movt");
STATISTIC(NumLoopByVals, "Number of loops generated for byval arguments");
cl::opt<bool>
EnableARMLongCalls("arm-long-calls", cl::Hidden,
cl::desc("Generate calls via indirect call instructions"),
cl::init(false));
static cl::opt<bool>
ARMInterworking("arm-interworking", cl::Hidden,
cl::desc("Enable / disable ARM interworking (for debugging only)"),
@ -1694,7 +1689,7 @@ ARMTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
bool isLocalARMFunc = false;
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
if (EnableARMLongCalls) {
if (Subtarget->genLongCalls()) {
assert((Subtarget->isTargetWindows() ||
getTargetMachine().getRelocationModel() == Reloc::Static) &&
"long-calls with non-static relocation model!");

1
lib/Target/ARM/ARMSubtarget.cpp
View File

@ -172,6 +172,7 @@ void ARMSubtarget::initializeEnvironment() {
AllowsUnalignedMem = false;
Thumb2DSP = false;
UseNaClTrap = false;
GenLongCalls = false;
UnsafeFPMath = false;
}

4
lib/Target/ARM/ARMSubtarget.h
View File

@ -206,6 +206,9 @@ protected:
/// NaCl TRAP instruction is generated instead of the regular TRAP.
bool UseNaClTrap;
/// Generate calls via indirect call instructions.
bool GenLongCalls;
/// Target machine allowed unsafe FP math (such as use of NEON fp)
bool UnsafeFPMath;
@ -342,6 +345,7 @@ public:
bool hasMPExtension() const { return HasMPExtension; }
bool hasThumb2DSP() const { return Thumb2DSP; }
bool useNaClTrap() const { return UseNaClTrap; }
bool genLongCalls() const { return GenLongCalls; }
bool hasFP16() const { return HasFP16; }
bool hasD16() const { return HasD16; }

2
test/CodeGen/ARM/Windows/long-calls.ll
View File

@ -1,4 +1,4 @@
; RUN: llc -mtriple=thumbv7-windows -mcpu=cortex-a9 -arm-long-calls -o - %s \
; RUN: llc -mtriple=thumbv7-windows -mcpu=cortex-a9 -mattr=+long-calls -o - %s \
; RUN: | FileCheck %s
declare arm_aapcs_vfpcc void @callee()

6
test/CodeGen/ARM/fast-isel-call.ll
View File

@ -1,9 +1,9 @@
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios | FileCheck %s --check-prefix=ARM
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-linux-gnueabi | FileCheck %s --check-prefix=ARM
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-ios | FileCheck %s --check-prefix=THUMB
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios -arm-long-calls | FileCheck %s --check-prefix=ARM-LONG
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-linux-gnueabi -arm-long-calls | FileCheck %s --check-prefix=ARM-LONG
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-ios -arm-long-calls | FileCheck %s --check-prefix=THUMB-LONG
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios -mattr=+long-calls | FileCheck %s --check-prefix=ARM-LONG
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-linux-gnueabi -mattr=+long-calls | FileCheck %s --check-prefix=ARM-LONG
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-ios -mattr=+long-calls | FileCheck %s --check-prefix=THUMB-LONG
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios -mattr=-vfp2 | FileCheck %s --check-prefix=ARM-NOVFP
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-linux-gnueabi -mattr=-vfp2 | FileCheck %s --check-prefix=ARM-NOVFP
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-ios -mattr=-vfp2 | FileCheck %s --check-prefix=THUMB-NOVFP

6
test/CodeGen/ARM/fast-isel-intrinsic.ll
View File

@ -1,9 +1,9 @@
; RUN: llc < %s -O0 -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios -verify-machineinstrs | FileCheck %s --check-prefix=ARM
; RUN: llc < %s -O0 -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-linux-gnueabi -verify-machineinstrs | FileCheck %s --check-prefix=ARM
; RUN: llc < %s -O0 -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-ios -verify-machineinstrs | FileCheck %s --check-prefix=THUMB
; RUN: llc < %s -O0 -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios -arm-long-calls -verify-machineinstrs | FileCheck %s --check-prefix=ARM-LONG
; RUN: llc < %s -O0 -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-linux-gnueabi -arm-long-calls -verify-machineinstrs | FileCheck %s --check-prefix=ARM-LONG
; RUN: llc < %s -O0 -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-ios -arm-long-calls -verify-machineinstrs | FileCheck %s --check-prefix=THUMB-LONG
; RUN: llc < %s -O0 -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios -mattr=+long-calls -verify-machineinstrs | FileCheck %s --check-prefix=ARM-LONG
; RUN: llc < %s -O0 -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=armv7-linux-gnueabi -mattr=+long-calls -verify-machineinstrs | FileCheck %s --check-prefix=ARM-LONG
; RUN: llc < %s -O0 -fast-isel-abort=1 -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-ios -mattr=+long-calls -verify-machineinstrs | FileCheck %s --check-prefix=THUMB-LONG
; Note that some of these tests assume that relocations are either
; movw/movt or constant pool loads. Different platforms will select

4
test/CodeGen/ARM/fast-isel-static.ll
View File

@ -1,5 +1,5 @@
; RUN: llc < %s -mtriple=thumbv7-apple-ios -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=static -arm-long-calls | FileCheck -check-prefix=CHECK-LONG %s
; RUN: llc < %s -mtriple=armv7-linux-gnueabi -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=static -arm-long-calls | FileCheck -check-prefix=CHECK-LONG %s
; RUN: llc < %s -mtriple=thumbv7-apple-ios -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=static -mattr=+long-calls | FileCheck -check-prefix=CHECK-LONG %s
; RUN: llc < %s -mtriple=armv7-linux-gnueabi -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=static -mattr=+long-calls | FileCheck -check-prefix=CHECK-LONG %s
; RUN: llc < %s -mtriple=thumbv7-apple-ios -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=static | FileCheck -check-prefix=CHECK-NORM %s
; RUN: llc < %s -mtriple=armv7-linux-gnueabi -O0 -verify-machineinstrs -fast-isel-abort=1 -relocation-model=static | FileCheck -check-prefix=CHECK-NORM %s

40
test/CodeGen/ARM/subtarget-features-long-calls.ll Normal file
View File

@ -0,0 +1,40 @@
; RUN: llc -march arm -mcpu cortex-a8 -relocation-model=static %s -o - | FileCheck -check-prefix=NO-OPTION %s
; RUN: llc -march arm -mcpu cortex-a8 -relocation-model=static %s -o - -mattr=+long-calls | FileCheck -check-prefix=LONGCALL %s
; RUN: llc -march arm -mcpu cortex-a8 -relocation-model=static %s -o - -mattr=-long-calls | FileCheck -check-prefix=NO-LONGCALL %s
; RUN: llc -march arm -mcpu cortex-a8 -relocation-model=static %s -o - -O0 | FileCheck -check-prefix=NO-OPTION %s
; RUN: llc -march arm -mcpu cortex-a8 -relocation-model=static %s -o - -O0 -mattr=+long-calls | FileCheck -check-prefix=LONGCALL %s
; RUN: llc -march arm -mcpu cortex-a8 -relocation-model=static %s -o - -O0 -mattr=-long-calls | FileCheck -check-prefix=NO-LONGCALL %s
; NO-OPTION-LABEL: {{_?}}caller0
; NO-OPTION: blx {{r[0-9]+}}
; LONGCALL-LABEL: {{_?}}caller0
; LONGCALL: blx {{r[0-9]+}}
; NO-LONGCALL-LABEL: {{_?}}caller0
; NO-LONGCALL: bl {{_?}}callee0
define i32 @caller0() #0 {
entry:
tail call void @callee0()
ret i32 0
}
; NO-OPTION-LABEL: {{_?}}caller1
; NO-OPTION: bl {{_?}}callee0
; LONGCALL-LABEL: {{_?}}caller1
; LONGCALL: blx {{r[0-9]+}}
; NO-LONGCALL-LABEL: {{_?}}caller1
; NO-LONGCALL: bl {{_?}}callee0
define i32 @caller1() {
entry:
tail call void @callee0()
ret i32 0
}
declare void @callee0()
attributes #0 = { "target-features"="+long-calls" }