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Put VMOVS widening under a command line option, off by default.

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It appears that our use of the imp-use and imp-def flags with
sub-registers is not yet robust enough to support this.

The failing test case is complicated, I am working on a reduction.

<rdar://problem/10044201>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138861 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-08-31 17:00:02 +00:00
parent 31d27ce568
commit 6154582983
1 changed files with 6 additions and 1 deletions
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7
lib/Target/ARM/ARMBaseInstrInfo.cpp
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@ -46,6 +46,10 @@ static cl::opt<bool>
EnableARM3Addr("enable-arm-3-addr-conv", cl::Hidden,
cl::desc("Enable ARM 2-addr to 3-addr conv"));
static cl::opt<bool>
WidenVMOVS("widen-vmovs", cl::Hidden,
cl::desc("Widen ARM vmovs to vmovd when possible"));
/// ARM_MLxEntry - Record information about MLA / MLS instructions.
struct ARM_MLxEntry {
unsigned MLxOpc; // MLA / MLS opcode
@ -637,7 +641,8 @@ void ARMBaseInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
// a VMOVD since that can be converted to a NEON-domain move by
// NEONMoveFix.cpp. Check that MI is the original COPY instruction, and
// that it really defines the whole D-register.
if ((DestReg - ARM::S0) % 2 == 0 && (SrcReg - ARM::S0) % 2 == 0 &&
if (WidenVMOVS &&
(DestReg - ARM::S0) % 2 == 0 && (SrcReg - ARM::S0) % 2 == 0 &&
I != MBB.end() && I->isCopy() &&
I->getOperand(0).getReg() == DestReg &&
I->getOperand(1).getReg() == SrcReg) {