Thumb2 does not have ib (increment before) and da (decrement after) forms of ldm / stm.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78057 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMLoadStoreOptimizer.cpp b/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
index 87a5aea..c6afbe9 100644
--- a/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
+++ b/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
@@ -176,13 +176,19 @@
ARM_AM::AMSubMode Mode = ARM_AM::ia;
bool isAM4 = isi32Load(Opcode) || isi32Store(Opcode);
- if (isAM4 && Offset == 4)
+ if (isAM4 && Offset == 4) {
+ if (isThumb2)
+ // Thumb2 does not support ldmib / stmib.
+ return false;
Mode = ARM_AM::ib;
- else if (isAM4 && Offset == -4 * (int)NumRegs + 4)
+ } else if (isAM4 && Offset == -4 * (int)NumRegs + 4) {
+ if (isThumb2)
+ // Thumb2 does not support ldmda / stmda.
+ return false;
Mode = ARM_AM::da;
- else if (isAM4 && Offset == -4 * (int)NumRegs)
+ } else if (isAM4 && Offset == -4 * (int)NumRegs) {
Mode = ARM_AM::db;
- else if (Offset != 0) {
+ } else if (Offset != 0) {
// If starting offset isn't zero, insert a MI to materialize a new base.
// But only do so if it is cost effective, i.e. merging more than two
// loads / stores.