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Don't merge restore with tail call instruction.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124167 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2011-01-25 01:28:33 +00:00
parent c0a7007d3a
commit 7cfa656ad8
2 changed files with 28 additions and 1 deletions
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7
lib/Target/ARM/ARMFrameLowering.cpp
View File

@ -586,6 +586,11 @@ void ARMFrameLowering::emitPopInst(MachineBasicBlock &MBB,
const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
DebugLoc DL = MI->getDebugLoc();
unsigned RetOpcode = MI->getOpcode();
bool isTailCall = (RetOpcode == ARM::TCRETURNdi ||
RetOpcode == ARM::TCRETURNdiND ||
RetOpcode == ARM::TCRETURNri ||
RetOpcode == ARM::TCRETURNriND);
SmallVector<unsigned, 4> Regs;
unsigned i = CSI.size();
@ -596,7 +601,7 @@ void ARMFrameLowering::emitPopInst(MachineBasicBlock &MBB,
unsigned Reg = CSI[i-1].getReg();
if (!(Func)(Reg, STI.isTargetDarwin())) continue;
if (Reg == ARM::LR && !isVarArg && STI.hasV5TOps()) {
if (Reg == ARM::LR && !isTailCall && !isVarArg && STI.hasV5TOps()) {
Reg = ARM::PC;
LdmOpc = AFI->isThumbFunction() ? ARM::t2LDMIA_RET : ARM::LDMIA_RET;
// Fold the return instruction into the LDM.

22
test/CodeGen/ARM/call-tc.ll
View File

@ -1,5 +1,6 @@
; RUN: llc < %s -mtriple=armv6-apple-darwin -mattr=+vfp2 -arm-tail-calls | FileCheck %s -check-prefix=CHECKV6
; RUN: llc < %s -mtriple=armv6-linux-gnueabi -relocation-model=pic -mattr=+vfp2 -arm-tail-calls | FileCheck %s -check-prefix=CHECKELF
; RUN: llc < %s -mtriple=thumbv7-apple-darwin -arm-tail-calls | FileCheck %s -check-prefix=CHECKT2
@t = weak global i32 ()* null ; <i32 ()**> [#uses=1]
@ -63,3 +64,24 @@ entry:
%0 = sdiv i32 %a, %b
ret i32 %0
}
; Make sure the tail call instruction isn't deleted
; rdar://8309338
declare void @foo() nounwind
define void @t7() nounwind {
entry:
; CHECKT2: t7:
; CHECKT2: blxeq _foo
; CHECKT2-NEXT: pop.w
; CHECKT2-NEXT: b.w _foo
br i1 undef, label %bb, label %bb1.lr.ph
bb1.lr.ph:
tail call void @foo() nounwind
unreachable
bb:
tail call void @foo() nounwind
ret void
}