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[X86] MOVPC32r should only emit CFI adjustments when needed

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We only want to emit CFI adjustments when actually using DWARF.
This fixes PR25828.

Differential Revision: http://reviews.llvm.org/D15522

llvm-svn: 255664
This commit is contained in:
Michael Kuperstein 2015-12-15 18:50:32 +00:00
parent 5c7e1e0f63
commit 7915950634
2 changed files with 35 additions and 4 deletions
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9
lib/Target/X86/X86MCInstLower.cpp
View File

@ -1145,11 +1145,12 @@ void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) {
bool hasFP = FrameLowering->hasFP(*MF);
// TODO: This is needed only if we require precise CFA.
bool NeedsDwarfCFI =
(MMI->hasDebugInfo() || MF->getFunction()->needsUnwindTableEntry());
bool HasActiveDwarfFrame = OutStreamer->getNumFrameInfos() &&
!OutStreamer->getDwarfFrameInfos().back().End;
int stackGrowth = -RI->getSlotSize();
if (NeedsDwarfCFI && !hasFP) {
if (HasActiveDwarfFrame && !hasFP) {
OutStreamer->EmitCFIAdjustCfaOffset(-stackGrowth);
}
@ -1160,7 +1161,7 @@ void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) {
EmitAndCountInstruction(MCInstBuilder(X86::POP32r)
.addReg(MI->getOperand(0).getReg()));
if (NeedsDwarfCFI && !hasFP) {
if (HasActiveDwarfFrame && !hasFP) {
OutStreamer->EmitCFIAdjustCfaOffset(stackGrowth);
}
return;

30
test/CodeGen/X86/pr25828.ll Normal file
View File

@ -0,0 +1,30 @@
; RUN: llc < %s -mtriple=i686-pc-windows-msvc -relocation-model=pic | FileCheck %s
; MOVPC32r should not generate CFI under windows
; CHECK-LABEL: _foo:
; CHECK-NOT: .cfi_adjust_cfa_offset
define void @foo(i8) {
entry-block:
switch i8 %0, label %bb2 [
i8 1, label %bb1
i8 2, label %bb2
i8 3, label %bb3
i8 4, label %bb4
i8 5, label %bb5
]
bb1:
ret void
bb2:
ret void
bb3:
ret void
bb4:
ret void
bb5:
ret void
}