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Use function attribute "stackrealign" to decide whether stack

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realignment should be forced.

With this commit, we can now force stack realignment when doing LTO and
do so on a per-function basis. Also, add a new cl::opt option
"stackrealign" to CommandFlags.h which is used to force stack
realignment via llc's command line.

Out-of-tree projects currently using -force-align-stack to force stack
realignment should make changes to attach the attribute to the functions
in the IR.

Differential Revision: http://reviews.llvm.org/D11814

llvm-svn: 247450
This commit is contained in:
Akira Hatanaka 2015-09-11 18:54:38 +00:00
parent dbbe591414
commit a71c14303e
14 changed files with 22 additions and 23 deletions
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9
include/llvm/CodeGen/CommandFlags.h
View File

@ -182,6 +182,11 @@ OverrideStackAlignment("stack-alignment",
cl::desc("Override default stack alignment"),
cl::init(0));
cl::opt<bool>
StackRealign("stackrealign",
cl::desc("Force align the stack to the minimum alignment"),
cl::init(false));
cl::opt<std::string>
TrapFuncName("trap-func", cl::Hidden,
cl::desc("Emit a call to trap function rather than a trap instruction"),
@ -330,6 +335,10 @@ static inline void setFunctionAttributes(StringRef CPU, StringRef Features,
"disable-tail-calls",
toStringRef(DisableTailCalls));
if (StackRealign)
NewAttrs = NewAttrs.addAttribute(Ctx, AttributeSet::FunctionIndex,
"stackrealign");
if (TrapFuncName.getNumOccurrences() > 0)
for (auto &B : F)
for (auto &I : B)

2
include/llvm/Target/TargetRegisterInfo.h
View File

@ -35,8 +35,6 @@ class VirtRegMap;
class raw_ostream;
class LiveRegMatrix;
extern cl::opt<bool> ForceStackAlign;
class TargetRegisterClass {
public:
typedef const MCPhysReg* iterator;

10
lib/CodeGen/TargetRegisterInfo.cpp
View File

@ -24,14 +24,6 @@
#define DEBUG_TYPE "target-reg-info"
namespace llvm {
cl::opt<bool>
ForceStackAlign("force-align-stack",
cl::desc("Force align the stack to the minimum alignment"
" needed for the function."),
cl::init(false), cl::Hidden);
} // end namespace llvm
using namespace llvm;
TargetRegisterInfo::TargetRegisterInfo(const TargetRegisterInfoDesc *ID,
@ -321,7 +313,7 @@ bool TargetRegisterInfo::needsStackRealignment(
unsigned StackAlign = TFI->getStackAlignment();
bool requiresRealignment = ((MFI->getMaxAlignment() > StackAlign) ||
F->hasFnAttribute(Attribute::StackAlignment));
if (ForceStackAlign || requiresRealignment) {
if (MF.getFunction()->hasFnAttribute("stackrealign") || requiresRealignment) {
if (canRealignStack(MF))
return true;
DEBUG(dbgs() << "Can't realign function's stack: " << F->getName() << "\n");

2
lib/Target/X86/X86FrameLowering.cpp
View File

@ -499,7 +499,7 @@ uint64_t X86FrameLowering::calculateMaxStackAlign(const MachineFunction &MF) con
const MachineFrameInfo *MFI = MF.getFrameInfo();
uint64_t MaxAlign = MFI->getMaxAlignment(); // Desired stack alignment.
unsigned StackAlign = getStackAlignment();
if (ForceStackAlign) {
if (MF.getFunction()->hasFnAttribute("stackrealign")) {
if (MFI->hasCalls())
MaxAlign = (StackAlign > MaxAlign) ? StackAlign : MaxAlign;
else if (MaxAlign < SlotSize)

2
test/CodeGen/Generic/ForceStackAlign.ll
View File

@ -1,7 +1,7 @@
; Check that stack alignment can be forced. Individual targets should test their
; specific implementation details.
; RUN: llc < %s -force-align-stack -stack-alignment=32 | FileCheck %s
; RUN: llc < %s -stackrealign -stack-alignment=32 | FileCheck %s
; CHECK-LABEL: @f
; CHECK-LABEL: @g

2
test/CodeGen/X86/dynamic-allocas-VLAs.ll
View File

@ -1,5 +1,5 @@
; RUN: llc < %s -mcpu=generic -march=x86-64 -mattr=+avx -mtriple=i686-apple-darwin10 | FileCheck %s
; RUN: llc < %s -mcpu=generic -force-align-stack -stack-alignment=32 -march=x86-64 -mattr=+avx -mtriple=i686-apple-darwin10 | FileCheck %s -check-prefix=FORCE-ALIGN
; RUN: llc < %s -mcpu=generic -stackrealign -stack-alignment=32 -march=x86-64 -mattr=+avx -mtriple=i686-apple-darwin10 | FileCheck %s -check-prefix=FORCE-ALIGN
; rdar://11496434
; no VLAs or dynamic alignment

2
test/CodeGen/X86/force-align-stack-alloca.ll
View File

@ -3,7 +3,7 @@
; arbitrarily force alignment up to 32-bytes for i386 hoping that this will
; exceed any ABI provisions.
;
; RUN: llc < %s -mcpu=generic -force-align-stack -stack-alignment=32 | FileCheck %s
; RUN: llc < %s -mcpu=generic -stackrealign -stack-alignment=32 | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32-S128"
target triple = "i386-unknown-linux-gnu"

2
test/CodeGen/X86/force-align-stack.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -relocation-model=static -force-align-stack | FileCheck %s
; RUN: llc < %s -relocation-model=static -stackrealign | FileCheck %s
; Tests to make sure that we always align the stack out to the minimum needed -
; in this case 16-bytes.
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"

2
test/CodeGen/X86/inline-asm-sp-clobber-memcpy.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -force-align-stack -mtriple i386-apple-darwin -mcpu=i486 | FileCheck %s
; RUN: llc < %s -stackrealign -mtriple i386-apple-darwin -mcpu=i486 | FileCheck %s
%struct.foo = type { [88 x i8] }

2
test/CodeGen/X86/movtopush.ll
View File

@ -1,6 +1,6 @@
; RUN: llc < %s -mtriple=i686-windows | FileCheck %s -check-prefix=NORMAL
; RUN: llc < %s -mtriple=x86_64-windows | FileCheck %s -check-prefix=X64
; RUN: llc < %s -mtriple=i686-windows -force-align-stack -stack-alignment=32 | FileCheck %s -check-prefix=ALIGNED
; RUN: llc < %s -mtriple=i686-windows -stackrealign -stack-alignment=32 | FileCheck %s -check-prefix=ALIGNED
%class.Class = type { i32 }
%struct.s = type { i64 }

2
test/CodeGen/X86/pr11468.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -force-align-stack -stack-alignment=32 -march=x86-64 -mattr=+avx -mtriple=i686-apple-darwin10 | FileCheck %s
; RUN: llc < %s -stackrealign -stack-alignment=32 -march=x86-64 -mattr=+avx -mtriple=i686-apple-darwin10 | FileCheck %s
; PR11468
define void @f(i64 %sz) uwtable {

2
test/CodeGen/X86/stack-align-memcpy.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -force-align-stack -mtriple i386-apple-darwin -mcpu=i486 | FileCheck %s
; RUN: llc < %s -stackrealign -mtriple i386-apple-darwin -mcpu=i486 | FileCheck %s
%struct.foo = type { [88 x i8] }

2
test/CodeGen/X86/unaligned-spill-folding.ll
View File

@ -1,6 +1,6 @@
; RUN: llc -mtriple=i386-unknown-freebsd -mcpu=core2 -stack-alignment=4 -relocation-model=pic < %s | FileCheck %s -check-prefix=UNALIGNED
; RUN: llc -mtriple=i386-unknown-freebsd -mcpu=core2 -stack-alignment=16 -relocation-model=pic < %s | FileCheck %s -check-prefix=ALIGNED
; RUN: llc -mtriple=i386-unknown-freebsd -mcpu=core2 -stack-alignment=4 -force-align-stack -relocation-model=pic < %s | FileCheck %s -check-prefix=FORCEALIGNED
; RUN: llc -mtriple=i386-unknown-freebsd -mcpu=core2 -stack-alignment=4 -stackrealign -relocation-model=pic < %s | FileCheck %s -check-prefix=FORCEALIGNED
@arr = internal unnamed_addr global [32 x i32] zeroinitializer, align 16

4
test/CodeGen/X86/x86-64-baseptr.ll
View File

@ -1,5 +1,5 @@
; RUN: llc -mtriple=x86_64-pc-linux -force-align-stack -stack-alignment=32 < %s | FileCheck %s
; RUN: llc -mtriple=x86_64-pc-linux-gnux32 -force-align-stack -stack-alignment=32 < %s | FileCheck -check-prefix=X32ABI %s
; RUN: llc -mtriple=x86_64-pc-linux -stackrealign -stack-alignment=32 < %s | FileCheck %s
; RUN: llc -mtriple=x86_64-pc-linux-gnux32 -stackrealign -stack-alignment=32 < %s | FileCheck -check-prefix=X32ABI %s
; This should run with NaCl as well ( -mtriple=x86_64-pc-nacl ) but currently doesn't due to PR22655
; Make sure the correct register gets set up as the base pointer