It turns out most of the thumb2 instructions are not allowed to touch SP. The semantics of such instructions are unpredictable. We have just been lucky that tests have been passing.
This patch takes pain to ensure all the PEI lowering code does the right thing when lowering frame indices, insert code to manipulate stack pointers, etc. It's also custom lowering dynamic stack alloc into pseudo instructions so we can insert the right instructions at scheduling time.
This fixes PR4659 and PR4682.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78361 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelLowering.h b/lib/Target/ARM/ARMISelLowering.h
index 4fe4d8b..4649c18 100644
--- a/lib/Target/ARM/ARMISelLowering.h
+++ b/lib/Target/ARM/ARMISelLowering.h
@@ -65,11 +65,13 @@
FMRRD, // double to two gprs.
FMDRR, // Two gprs to double.
- EH_SJLJ_SETJMP, // SjLj exception handling setjmp
- EH_SJLJ_LONGJMP, // SjLj exception handling longjmp
+ EH_SJLJ_SETJMP, // SjLj exception handling setjmp.
+ EH_SJLJ_LONGJMP, // SjLj exception handling longjmp.
THREAD_POINTER,
+ DYN_ALLOC, // Dynamic allocation on the stack.
+
VCEQ, // Vector compare equal.
VCGE, // Vector compare greater than or equal.
VCGEU, // Vector compare unsigned greater than or equal.
@@ -255,6 +257,7 @@
SDValue LowerGLOBAL_OFFSET_TABLE(SDValue Op, SelectionDAG &DAG);
SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG);
SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG);
+ SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG);
SDValue EmitTargetCodeForMemcpy(SelectionDAG &DAG, DebugLoc dl,
SDValue Chain,