Fix a rather obscure crash caused by ARM fast-isel generating code which redefines a register.
rdar://problem/9338332 .
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130454 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMFastISel.cpp b/lib/Target/ARM/ARMFastISel.cpp
index 3e0b755..54b9d2d 100644
--- a/lib/Target/ARM/ARMFastISel.cpp
+++ b/lib/Target/ARM/ARMFastISel.cpp
@@ -822,26 +822,9 @@
// Since the offset is too large for the load/store instruction
// get the reg+offset into a register.
if (needsLowering) {
- ARMCC::CondCodes Pred = ARMCC::AL;
- unsigned PredReg = 0;
-
- TargetRegisterClass *RC = isThumb ? ARM::tGPRRegisterClass :
- ARM::GPRRegisterClass;
- unsigned BaseReg = createResultReg(RC);
-
- if (!isThumb)
- emitARMRegPlusImmediate(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
- BaseReg, Addr.Base.Reg, Addr.Offset,
- Pred, PredReg,
- static_cast<const ARMBaseInstrInfo&>(TII));
- else {
- assert(AFI->isThumb2Function());
- emitT2RegPlusImmediate(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
- BaseReg, Addr.Base.Reg, Addr.Offset, Pred, PredReg,
- static_cast<const ARMBaseInstrInfo&>(TII));
- }
+ Addr.Base.Reg = FastEmit_ri_(MVT::i32, ISD::ADD, Addr.Base.Reg,
+ /*Op0IsKill*/false, Addr.Offset, MVT::i32);
Addr.Offset = 0;
- Addr.Base.Reg = BaseReg;
}
}
diff --git a/test/CodeGen/ARM/fast-isel-redefinition.ll b/test/CodeGen/ARM/fast-isel-redefinition.ll
new file mode 100644
index 0000000..262432f
--- /dev/null
+++ b/test/CodeGen/ARM/fast-isel-redefinition.ll
@@ -0,0 +1,11 @@
+; RUN: llc -O0 -regalloc=linearscan | grep "ldr r0"
+; This isn't exactly a useful set of command-line options, but check that it
+; doesn't crash. (It was crashing because a register was getting redefined.)
+
+target triple = "thumbv7-apple-macosx10.6.7"
+
+define i32 @f(i32* %x) nounwind ssp {
+ %y = getelementptr inbounds i32* %x, i32 5000
+ %tmp103 = load i32* %y, align 4
+ ret i32 %tmp103
+}