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[FastISel][AArch64] Use the correct register class for branches.

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Also constrain the register class for branches.

This fixes rdar://problem/18181496.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216804 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Juergen Ributzka 2014-08-29 23:48:06 +00:00
parent bc420a0cc1
commit e7f301e079
2 changed files with 24 additions and 7 deletions
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16
lib/Target/AArch64/AArch64FastISel.cpp
View File

@ -2182,15 +2182,16 @@ bool AArch64FastISel::FastLowerCall(CallLoweringInfo &CLI) {
// Issue the call.
MachineInstrBuilder MIB;
if (CM == CodeModel::Small) {
unsigned CallOpc = Addr.getReg() ? AArch64::BLR : AArch64::BL;
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(CallOpc));
const MCInstrDesc &II = TII.get(Addr.getReg() ? AArch64::BLR : AArch64::BL);
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II);
if (SymName)
MIB.addExternalSymbol(SymName, 0);
else if (Addr.getGlobalValue())
MIB.addGlobalAddress(Addr.getGlobalValue(), 0, 0);
else if (Addr.getReg())
MIB.addReg(Addr.getReg());
else
else if (Addr.getReg()) {
unsigned Reg = constrainOperandRegClass(II, Addr.getReg(), 0);
MIB.addReg(Reg);
} else
return false;
} else {
unsigned CallReg = 0;
@ -2214,8 +2215,9 @@ bool AArch64FastISel::FastLowerCall(CallLoweringInfo &CLI) {
if (!CallReg)
return false;
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
TII.get(AArch64::BLR)).addReg(CallReg);
const MCInstrDesc &II = TII.get(AArch64::BLR);
CallReg = constrainOperandRegClass(II, CallReg, 0);
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II).addReg(CallReg);
}
// Add implicit physical register uses to the call.

15
test/CodeGen/AArch64/arm64-fast-isel-call.ll
View File

@ -252,3 +252,18 @@ define void @call_arguments9(i8 %a1, i16 %a2, i32 %a3, i64 %a4, float %a5, doubl
; CHECK-LABEL: call_arguments9
ret void
}
; Test that we use the correct register class for the branch.
define void @call_blr(i64 %Fn, i1 %c) {
; CHECK-LABEL: call_blr
; CHECK: blr
br i1 %c, label %bb1, label %bb2
bb1:
%1 = inttoptr i64 %Fn to void (i64)*
br label %bb2
bb2:
%2 = phi void (i64)* [ %1, %bb1 ], [ undef, %0 ]
call void %2(i64 1)
ret void
}