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Fall back to selection DAG isel for calls to builtin functions.

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Fast isel doesn't currently have support for translating builtin function
calls to target instructions.  For embedded environments where the library
functions are not available, this is a matter of correctness and not
just optimization.  Most of this patch is just arranging to make the
TargetLibraryInfo available in fast isel.  <rdar://problem/12008746>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161232 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson 2012-08-03 04:06:28 +00:00
parent d1e672e023
commit d49edb7ab0
11 changed files with 59 additions and 20 deletions
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5
include/llvm/CodeGen/FastISel.h
View File

@ -34,6 +34,7 @@ class MachineFrameInfo;
class MachineRegisterInfo;
class TargetData;
class TargetInstrInfo;
class TargetLibraryInfo;
class TargetLowering;
class TargetMachine;
class TargetRegisterClass;
@ -57,6 +58,7 @@ protected:
const TargetInstrInfo &TII;
const TargetLowering &TLI;
const TargetRegisterInfo &TRI;
const TargetLibraryInfo *LibInfo;
/// The position of the last instruction for materializing constants
/// for use in the current block. It resets to EmitStartPt when it
@ -144,7 +146,8 @@ public:
virtual ~FastISel();
protected:
explicit FastISel(FunctionLoweringInfo &funcInfo);
explicit FastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo);
/// TargetSelectInstruction - This method is called by target-independent
/// code when the normal FastISel process fails to select an instruction.

4
include/llvm/Target/TargetLowering.h
View File

@ -51,6 +51,7 @@ namespace llvm {
template<typename T> class SmallVectorImpl;
class TargetData;
class TargetRegisterClass;
class TargetLibraryInfo;
class TargetLoweringObjectFile;
class Value;
@ -1413,7 +1414,8 @@ public:
/// createFastISel - This method returns a target specific FastISel object,
/// or null if the target does not support "fast" ISel.
virtual FastISel *createFastISel(FunctionLoweringInfo &) const {
virtual FastISel *createFastISel(FunctionLoweringInfo &,
const TargetLibraryInfo *) const {
return 0;
}

19
lib/CodeGen/SelectionDAG/FastISel.cpp
View File

@ -55,6 +55,7 @@
#include "llvm/Analysis/Loads.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetLibraryInfo.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/ErrorHandling.h"
@ -789,6 +790,18 @@ FastISel::SelectInstruction(const Instruction *I) {
MachineBasicBlock::iterator SavedInsertPt = FuncInfo.InsertPt;
// As a special case, don't even try to handle calls to builtin library
// functions so that calls to builtin functions get translated to
// instructions when supported by the target.
if (const CallInst *Call = dyn_cast<CallInst>(I)) {
const Function *F = Call->getCalledFunction();
LibFunc::Func Func;
if (F && !F->hasLocalLinkage() && F->hasName() &&
LibInfo->getLibFunc(F->getName(), Func) &&
LibInfo->has(Func))
return false;
}
// First, try doing target-independent selection.
if (SelectOperator(I, I->getOpcode())) {
++NumFastIselSuccessIndependent;
@ -1040,7 +1053,8 @@ FastISel::SelectOperator(const User *I, unsigned Opcode) {
}
}
FastISel::FastISel(FunctionLoweringInfo &funcInfo)
FastISel::FastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo)
: FuncInfo(funcInfo),
MRI(FuncInfo.MF->getRegInfo()),
MFI(*FuncInfo.MF->getFrameInfo()),
@ -1049,7 +1063,8 @@ FastISel::FastISel(FunctionLoweringInfo &funcInfo)
TD(*TM.getTargetData()),
TII(*TM.getInstrInfo()),
TLI(*TM.getTargetLowering()),
TRI(*TM.getRegisterInfo()) {
TRI(*TM.getRegisterInfo()),
LibInfo(libInfo) {
}
FastISel::~FastISel() {}

2
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -979,7 +979,7 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
// Initialize the Fast-ISel state, if needed.
FastISel *FastIS = 0;
if (TM.Options.EnableFastISel)
FastIS = TLI.createFastISel(*FuncInfo);
FastIS = TLI.createFastISel(*FuncInfo, LibInfo);
// Iterate over all basic blocks in the function.
ReversePostOrderTraversal<const Function*> RPOT(&Fn);

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

@ -87,8 +87,9 @@ class ARMFastISel : public FastISel {
LLVMContext *Context;
public:
explicit ARMFastISel(FunctionLoweringInfo &funcInfo)
: FastISel(funcInfo),
explicit ARMFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo)
: FastISel(funcInfo, libInfo),
TM(funcInfo.MF->getTarget()),
TII(*TM.getInstrInfo()),
TLI(*TM.getTargetLowering()) {
@ -2787,14 +2788,15 @@ bool ARMFastISel::TryToFoldLoad(MachineInstr *MI, unsigned OpNo,
}
namespace llvm {
FastISel *ARM::createFastISel(FunctionLoweringInfo &funcInfo) {
FastISel *ARM::createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo) {
// Completely untested on non-iOS.
const TargetMachine &TM = funcInfo.MF->getTarget();
// Darwin and thumb1 only for now.
const ARMSubtarget *Subtarget = &TM.getSubtarget<ARMSubtarget>();
if (Subtarget->isTargetIOS() && !Subtarget->isThumb1Only())
return new ARMFastISel(funcInfo);
return new ARMFastISel(funcInfo, libInfo);
return 0;
}
}

5
lib/Target/ARM/ARMISelLowering.cpp
View File

@ -1041,8 +1041,9 @@ const TargetRegisterClass *ARMTargetLowering::getRegClassFor(EVT VT) const {
// Create a fast isel object.
FastISel *
ARMTargetLowering::createFastISel(FunctionLoweringInfo &funcInfo) const {
return ARM::createFastISel(funcInfo);
ARMTargetLowering::createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo) const {
return ARM::createFastISel(funcInfo, libInfo);
}
/// getMaximalGlobalOffset - Returns the maximal possible offset which can

6
lib/Target/ARM/ARMISelLowering.h
View File

@ -361,7 +361,8 @@ namespace llvm {
/// createFastISel - This method returns a target specific FastISel object,
/// or null if the target does not support "fast" ISel.
virtual FastISel *createFastISel(FunctionLoweringInfo &funcInfo) const;
virtual FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo) const;
Sched::Preference getSchedulingPreference(SDNode *N) const;
@ -544,7 +545,8 @@ namespace llvm {
namespace ARM {
FastISel *createFastISel(FunctionLoweringInfo &funcInfo);
FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo);
}
}

9
lib/Target/X86/X86FastISel.cpp
View File

@ -57,7 +57,9 @@ class X86FastISel : public FastISel {
bool X86ScalarSSEf32;
public:
explicit X86FastISel(FunctionLoweringInfo &funcInfo) : FastISel(funcInfo) {
explicit X86FastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo)
: FastISel(funcInfo, libInfo) {
Subtarget = &TM.getSubtarget<X86Subtarget>();
StackPtr = Subtarget->is64Bit() ? X86::RSP : X86::ESP;
X86ScalarSSEf64 = Subtarget->hasSSE2();
@ -2199,7 +2201,8 @@ bool X86FastISel::TryToFoldLoad(MachineInstr *MI, unsigned OpNo,
namespace llvm {
FastISel *X86::createFastISel(FunctionLoweringInfo &funcInfo) {
return new X86FastISel(funcInfo);
FastISel *X86::createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo) {
return new X86FastISel(funcInfo, libInfo);
}
}

5
lib/Target/X86/X86ISelLowering.cpp
View File

@ -2896,8 +2896,9 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
}
FastISel *
X86TargetLowering::createFastISel(FunctionLoweringInfo &funcInfo) const {
return X86::createFastISel(funcInfo);
X86TargetLowering::createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo) const {
return X86::createFastISel(funcInfo, libInfo);
}

6
lib/Target/X86/X86ISelLowering.h
View File

@ -670,7 +670,8 @@ namespace llvm {
/// createFastISel - This method returns a target specific FastISel object,
/// or null if the target does not support "fast" ISel.
virtual FastISel *createFastISel(FunctionLoweringInfo &funcInfo) const;
virtual FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo) const;
/// getStackCookieLocation - Return true if the target stores stack
/// protector cookies at a fixed offset in some non-standard address
@ -947,7 +948,8 @@ namespace llvm {
};
namespace X86 {
FastISel *createFastISel(FunctionLoweringInfo &funcInfo);
FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo);
}
}

8
test/CodeGen/X86/fabs.ll
View File

@ -1,6 +1,7 @@
; Make sure this testcase codegens to the fabs instruction, not a call to fabsf
; RUN: llc < %s -march=x86 -mattr=-sse2,-sse3,-sse | FileCheck %s
; RUN: llc < %s -march=x86 -mattr=-sse,-sse2,-sse3 -enable-unsafe-fp-math -enable-no-nans-fp-math | FileCheck %s --check-prefix=UNSAFE
; RUN: llc < %s -march=x86-64 -O0 | FileCheck %s --check-prefix=NOOPT
declare float @fabsf(float)
@ -8,6 +9,7 @@ declare x86_fp80 @fabsl(x86_fp80)
; CHECK: test1:
; UNSAFE: test1:
; NOOPT: test1:
define float @test1(float %X) {
%Y = call float @fabsf(float %X)
ret float %Y
@ -17,9 +19,11 @@ define float @test1(float %X) {
; CHECK-NOT: fabs
; UNSAFE-NOT: fabs
; NOOPT-NOT: fabsf
; CHECK: test2:
; UNSAFE: test2:
; NOOPT: test2:
define double @test2(double %X) {
%Y = fcmp oge double %X, -0.0
%Z = fsub double -0.0, %X
@ -28,6 +32,7 @@ define double @test2(double %X) {
}
; fabs is not used here.
; CHECK-NOT: fabs
; NOOPT-NOT: fabs
; UNSAFE: {{^[ \t]+fabs$}}
@ -35,12 +40,15 @@ define double @test2(double %X) {
; CHECK: test3:
; UNSAFE: test3:
; NOOPT: test3:
define x86_fp80 @test3(x86_fp80 %X) {
%Y = call x86_fp80 @fabsl(x86_fp80 %X)
ret x86_fp80 %Y
}
; CHECK: {{^[ \t]+fabs$}}
; UNSAFE: {{^[ \t]+fabs$}}
; NOOPT: {{^[ \t]+fabs$}}
; CHECK-NOT: fabs
; UNSAFE-NOT: fabs
; NOOPT-NOT: fabs