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CXX_FAST_TLS calling convention: fix issue on X86-64. 

When we have a single basic block, the explicit copy-back instructions should
be inserted right before the terminator. Before this fix, they were wrongly
placed at the beginning of the basic block.

I will commit fixes to other platforms as well.

PR26136

llvm-svn: 257925
This commit is contained in:
Manman Ren 2016-01-15 19:35:42 +00:00
parent 285d7bd4e7
commit 4fe01bd8f9
2 changed files with 20 additions and 4 deletions
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9
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -28908,6 +28908,7 @@ void X86TargetLowering::insertCopiesSplitCSR(
const TargetInstrInfo *TII = Subtarget->getInstrInfo();
MachineRegisterInfo *MRI = &Entry->getParent()->getRegInfo();
MachineBasicBlock::iterator MBBI = Entry->begin();
for (const MCPhysReg *I = IStart; *I; ++I) {
const TargetRegisterClass *RC = nullptr;
if (X86::GR64RegClass.contains(*I))
@ -28925,13 +28926,13 @@ void X86TargetLowering::insertCopiesSplitCSR(
Attribute::NoUnwind) &&
"Function should be nounwind in insertCopiesSplitCSR!");
Entry->addLiveIn(*I);
BuildMI(*Entry, Entry->begin(), DebugLoc(), TII->get(TargetOpcode::COPY),
NewVR)
BuildMI(*Entry, MBBI, DebugLoc(), TII->get(TargetOpcode::COPY), NewVR)
.addReg(*I);
// Insert the copy-back instructions right before the terminator.
for (auto *Exit : Exits)
BuildMI(*Exit, Exit->begin(), DebugLoc(), TII->get(TargetOpcode::COPY),
*I)
BuildMI(*Exit, Exit->getFirstTerminator(), DebugLoc(),
TII->get(TargetOpcode::COPY), *I)
.addReg(NewVR);
}
}

15
llvm/test/CodeGen/X86/cxx_tlscc64.ll
View File

@ -9,6 +9,7 @@
@sg = internal thread_local global %struct.S zeroinitializer, align 1
@__dso_handle = external global i8
@__tls_guard = internal thread_local unnamed_addr global i1 false
@sum1 = internal thread_local global i32 0, align 4
declare void @_ZN1SC1Ev(%struct.S*)
declare void @_ZN1SD1Ev(%struct.S*)
@ -50,3 +51,17 @@ init.i:
__tls_init.exit:
ret %struct.S* @sg
}
; CHECK-LABEL: _ZTW4sum1
; CHECK-NOT: pushq %r11
; CHECK-NOT: pushq %r10
; CHECK-NOT: pushq %r9
; CHECK-NOT: pushq %r8
; CHECK-NOT: pushq %rsi
; CHECK-NOT: pushq %rdx
; CHECK-NOT: pushq %rcx
; CHECK-NOT: pushq %rbx
; CHECK: callq
define cxx_fast_tlscc nonnull i32* @_ZTW4sum1() nounwind {
ret i32* @sum1
}