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Revert svn 107892 (with changes to work with trunk). It caused a crash if

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a VLD result was not used (Radar 8355607).  It should also fix pr7988, but
I haven't verified that yet.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112118 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson 2010-08-26 00:13:36 +00:00
parent c87a6d4fb0
commit 2ac124c561
2 changed files with 42 additions and 1 deletions
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29
lib/Target/ARM/NEONPreAllocPass.cpp
View File

@ -447,7 +447,34 @@ bool NEONPreAllocPass::PreAllocNEONRegisters(MachineBasicBlock &MBB) {
continue;
if (FormsRegSequence(MI, FirstOpnd, NumRegs, Offset, Stride))
continue;
llvm_unreachable("expected a REG_SEQUENCE");
MachineBasicBlock::iterator NextI = llvm::next(MBBI);
for (unsigned R = 0; R < NumRegs; ++R) {
MachineOperand &MO = MI->getOperand(FirstOpnd + R);
assert(MO.isReg() && MO.getSubReg() == 0 && "unexpected operand");
unsigned VirtReg = MO.getReg();
assert(TargetRegisterInfo::isVirtualRegister(VirtReg) &&
"expected a virtual register");
// For now, just assign a fixed set of adjacent registers.
// This leaves plenty of room for future improvements.
static const unsigned NEONDRegs[] = {
ARM::D0, ARM::D1, ARM::D2, ARM::D3,
ARM::D4, ARM::D5, ARM::D6, ARM::D7
};
MO.setReg(NEONDRegs[Offset + R * Stride]);
if (MO.isUse()) {
// Insert a copy from VirtReg.
BuildMI(MBB, MBBI, DebugLoc(), TII->get(TargetOpcode::COPY),MO.getReg())
.addReg(VirtReg, getKillRegState(MO.isKill()));
MO.setIsKill();
} else if (MO.isDef() && !MO.isDead()) {
// Add a copy to VirtReg.
BuildMI(MBB, NextI, DebugLoc(), TII->get(TargetOpcode::COPY), VirtReg)
.addReg(MO.getReg());
}
}
}
return Modified;

14
test/CodeGen/ARM/vld1.ll
View File

@ -89,3 +89,17 @@ declare <8 x i16> @llvm.arm.neon.vld1.v8i16(i8*) nounwind readonly
declare <4 x i32> @llvm.arm.neon.vld1.v4i32(i8*) nounwind readonly
declare <4 x float> @llvm.arm.neon.vld1.v4f32(i8*) nounwind readonly
declare <2 x i64> @llvm.arm.neon.vld1.v2i64(i8*) nounwind readonly
; Radar 8355607
; Do not crash if the vld1 result is not used.
define void @unused_vld1_result() {
entry:
;CHECK: unused_vld1_result
;CHECK: vld1.32
%0 = call <4 x float> @llvm.arm.neon.vld1.v4f32(i8* undef)
call void @llvm.trap()
unreachable
}
declare void @llvm.trap() nounwind