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[ShrinkWrap] Make sure we do not mess up with EH funclet lowering.

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ShrinkWrapping does not understand exception handling constraints for now, so
make sure we do not mess with them by aborting on functions that use EH
funclets.

llvm-svn: 252917
This commit is contained in:
Quentin Colombet 2015-11-12 18:13:42 +00:00
parent 33ebda0446
commit fd63272890
2 changed files with 14 additions and 2 deletions
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12
lib/CodeGen/ShrinkWrap.cpp
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@ -63,11 +63,13 @@
#include "llvm/CodeGen/Passes.h"
// To know about callee-saved.
#include "llvm/CodeGen/RegisterClassInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/Support/Debug.h"
// To query the target about frame lowering.
#include "llvm/Target/TargetFrameLowering.h"
// To know about frame setup operation.
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
// To access TargetInstrInfo.
#include "llvm/Target/TargetSubtargetInfo.h"
@ -377,6 +379,11 @@ bool ShrinkWrap::runOnMachineFunction(MachineFunction &MF) {
DEBUG(dbgs() << "Look into: " << MBB.getNumber() << ' ' << MBB.getName()
<< '\n');
if (MBB.isEHFuncletEntry()) {
DEBUG(dbgs() << "EH Funclets are not supported yet.\n");
return false;
}
for (const MachineInstr &MI : MBB) {
if (!useOrDefCSROrFI(MI))
continue;
@ -458,7 +465,10 @@ bool ShrinkWrap::isShrinkWrapEnabled(const MachineFunction &MF) {
switch (EnableShrinkWrapOpt) {
case cl::BOU_UNSET:
return TFI->enableShrinkWrapping(MF);
return TFI->enableShrinkWrapping(MF) &&
// Windows with CFI has some limitations that makes it impossible
// to use shrink-wrapping.
!MF.getTarget().getMCAsmInfo()->usesWindowsCFI();
// If EnableShrinkWrap is set, it takes precedence on whatever the
// target sets. The rational is that we assume we want to test
// something related to shrink-wrapping.

4
test/CodeGen/X86/late-address-taken.ll
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@ -1,4 +1,6 @@
; RUN: llc -mtriple=x86_64-pc-windows-msvc < %s | FileCheck %s
; RUN: llc -mtriple=x86_64-pc-windows-msvc < %s -enable-shrink-wrap=false | FileCheck %s
; Make sure shrink-wrapping does not break the lowering of exception handling.
; RUN: llc -mtriple=x86_64-pc-windows-msvc < %s -enable-shrink-wrap=true | FileCheck %s
; Repro cases from PR25168