diff --git a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
--- a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
+++ b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
@@ -69,6 +69,7 @@
setOperationAction(ISD::EH_DWARF_CFA, MVT::i64, Custom);
setOperationAction(ISD::DYNAMIC_STACKALLOC, GRLenVT, Expand);
+ setOperationAction({ISD::STACKSAVE, ISD::STACKRESTORE}, MVT::Other, Expand);
setOperationAction(ISD::VASTART, MVT::Other, Custom);
setOperationAction({ISD::VAARG, ISD::VACOPY, ISD::VAEND}, MVT::Other, Expand);
diff --git a/llvm/test/CodeGen/LoongArch/alloca.ll b/llvm/test/CodeGen/LoongArch/alloca.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/CodeGen/LoongArch/alloca.ll
@@ -0,0 +1,191 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc --mtriple=loongarch32 --verify-machineinstrs < %s \
+; RUN: | FileCheck %s --check-prefix=LA32
+; RUN: llc --mtriple=loongarch64 --verify-machineinstrs < %s \
+; RUN: | FileCheck %s --check-prefix=LA64
+
+declare void @notdead(ptr)
+
+;; These tests must ensure the stack pointer is restored using the frame
+;; pointer
+
+define void @simple_alloca(i32 %n) nounwind {
+; LA32-LABEL: simple_alloca:
+; LA32: # %bb.0:
+; LA32-NEXT: addi.w $sp, $sp, -16
+; LA32-NEXT: st.w $ra, $sp, 12 # 4-byte Folded Spill
+; LA32-NEXT: st.w $fp, $sp, 8 # 4-byte Folded Spill
+; LA32-NEXT: addi.w $fp, $sp, 16
+; LA32-NEXT: addi.w $a0, $a0, 15
+; LA32-NEXT: addi.w $a1, $zero, -16
+; LA32-NEXT: and $a0, $a0, $a1
+; LA32-NEXT: sub.w $a0, $sp, $a0
+; LA32-NEXT: move $sp, $a0
+; LA32-NEXT: bl %plt(notdead)
+; LA32-NEXT: addi.w $sp, $fp, -16
+; LA32-NEXT: ld.w $fp, $sp, 8 # 4-byte Folded Reload
+; LA32-NEXT: ld.w $ra, $sp, 12 # 4-byte Folded Reload
+; LA32-NEXT: addi.w $sp, $sp, 16
+; LA32-NEXT: ret
+;
+; LA64-LABEL: simple_alloca:
+; LA64: # %bb.0:
+; LA64-NEXT: addi.d $sp, $sp, -16
+; LA64-NEXT: st.d $ra, $sp, 8 # 8-byte Folded Spill
+; LA64-NEXT: st.d $fp, $sp, 0 # 8-byte Folded Spill
+; LA64-NEXT: addi.d $fp, $sp, 16
+; LA64-NEXT: addi.w $a1, $zero, -16
+; LA64-NEXT: lu32i.d $a1, 1
+; LA64-NEXT: bstrpick.d $a0, $a0, 31, 0
+; LA64-NEXT: addi.d $a0, $a0, 15
+; LA64-NEXT: and $a0, $a0, $a1
+; LA64-NEXT: sub.d $a0, $sp, $a0
+; LA64-NEXT: move $sp, $a0
+; LA64-NEXT: bl %plt(notdead)
+; LA64-NEXT: addi.d $sp, $fp, -16
+; LA64-NEXT: ld.d $fp, $sp, 0 # 8-byte Folded Reload
+; LA64-NEXT: ld.d $ra, $sp, 8 # 8-byte Folded Reload
+; LA64-NEXT: addi.d $sp, $sp, 16
+; LA64-NEXT: ret
+ %1 = alloca i8, i32 %n
+ call void @notdead(ptr %1)
+ ret void
+}
+
+declare ptr @llvm.stacksave()
+declare void @llvm.stackrestore(ptr)
+
+define void @scoped_alloca(i32 %n) nounwind {
+; LA32-LABEL: scoped_alloca:
+; LA32: # %bb.0:
+; LA32-NEXT: addi.w $sp, $sp, -16
+; LA32-NEXT: st.w $ra, $sp, 12 # 4-byte Folded Spill
+; LA32-NEXT: st.w $fp, $sp, 8 # 4-byte Folded Spill
+; LA32-NEXT: st.w $s0, $sp, 4 # 4-byte Folded Spill
+; LA32-NEXT: addi.w $fp, $sp, 16
+; LA32-NEXT: addi.w $a0, $a0, 15
+; LA32-NEXT: addi.w $a1, $zero, -16
+; LA32-NEXT: and $a0, $a0, $a1
+; LA32-NEXT: move $s0, $sp
+; LA32-NEXT: sub.w $a0, $sp, $a0
+; LA32-NEXT: move $sp, $a0
+; LA32-NEXT: bl %plt(notdead)
+; LA32-NEXT: move $sp, $s0
+; LA32-NEXT: addi.w $sp, $fp, -16
+; LA32-NEXT: ld.w $s0, $sp, 4 # 4-byte Folded Reload
+; LA32-NEXT: ld.w $fp, $sp, 8 # 4-byte Folded Reload
+; LA32-NEXT: ld.w $ra, $sp, 12 # 4-byte Folded Reload
+; LA32-NEXT: addi.w $sp, $sp, 16
+; LA32-NEXT: ret
+;
+; LA64-LABEL: scoped_alloca:
+; LA64: # %bb.0:
+; LA64-NEXT: addi.d $sp, $sp, -32
+; LA64-NEXT: st.d $ra, $sp, 24 # 8-byte Folded Spill
+; LA64-NEXT: st.d $fp, $sp, 16 # 8-byte Folded Spill
+; LA64-NEXT: st.d $s0, $sp, 8 # 8-byte Folded Spill
+; LA64-NEXT: addi.d $fp, $sp, 32
+; LA64-NEXT: addi.w $a1, $zero, -16
+; LA64-NEXT: lu32i.d $a1, 1
+; LA64-NEXT: bstrpick.d $a0, $a0, 31, 0
+; LA64-NEXT: addi.d $a0, $a0, 15
+; LA64-NEXT: and $a0, $a0, $a1
+; LA64-NEXT: move $s0, $sp
+; LA64-NEXT: sub.d $a0, $sp, $a0
+; LA64-NEXT: move $sp, $a0
+; LA64-NEXT: bl %plt(notdead)
+; LA64-NEXT: move $sp, $s0
+; LA64-NEXT: addi.d $sp, $fp, -32
+; LA64-NEXT: ld.d $s0, $sp, 8 # 8-byte Folded Reload
+; LA64-NEXT: ld.d $fp, $sp, 16 # 8-byte Folded Reload
+; LA64-NEXT: ld.d $ra, $sp, 24 # 8-byte Folded Reload
+; LA64-NEXT: addi.d $sp, $sp, 32
+; LA64-NEXT: ret
+ %sp = call ptr @llvm.stacksave()
+ %addr = alloca i8, i32 %n
+ call void @notdead(ptr %addr)
+ call void @llvm.stackrestore(ptr %sp)
+ ret void
+}
+
+declare void @func(ptr, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32)
+
+;; Check that outgoing arguments passed on the stack do not corrupt a
+;; variable-sized stack object.
+define void @alloca_callframe(i32 %n) nounwind {
+; LA32-LABEL: alloca_callframe:
+; LA32: # %bb.0:
+; LA32-NEXT: addi.w $sp, $sp, -16
+; LA32-NEXT: st.w $ra, $sp, 12 # 4-byte Folded Spill
+; LA32-NEXT: st.w $fp, $sp, 8 # 4-byte Folded Spill
+; LA32-NEXT: addi.w $fp, $sp, 16
+; LA32-NEXT: addi.w $a0, $a0, 15
+; LA32-NEXT: addi.w $a1, $zero, -16
+; LA32-NEXT: and $a0, $a0, $a1
+; LA32-NEXT: sub.w $a0, $sp, $a0
+; LA32-NEXT: move $sp, $a0
+; LA32-NEXT: addi.w $sp, $sp, -16
+; LA32-NEXT: ori $a1, $zero, 12
+; LA32-NEXT: st.w $a1, $sp, 12
+; LA32-NEXT: ori $a1, $zero, 11
+; LA32-NEXT: st.w $a1, $sp, 8
+; LA32-NEXT: ori $a1, $zero, 10
+; LA32-NEXT: st.w $a1, $sp, 4
+; LA32-NEXT: ori $a1, $zero, 9
+; LA32-NEXT: st.w $a1, $sp, 0
+; LA32-NEXT: ori $a1, $zero, 2
+; LA32-NEXT: ori $a2, $zero, 3
+; LA32-NEXT: ori $a3, $zero, 4
+; LA32-NEXT: ori $a4, $zero, 5
+; LA32-NEXT: ori $a5, $zero, 6
+; LA32-NEXT: ori $a6, $zero, 7
+; LA32-NEXT: ori $a7, $zero, 8
+; LA32-NEXT: bl %plt(func)
+; LA32-NEXT: addi.w $sp, $sp, 16
+; LA32-NEXT: addi.w $sp, $fp, -16
+; LA32-NEXT: ld.w $fp, $sp, 8 # 4-byte Folded Reload
+; LA32-NEXT: ld.w $ra, $sp, 12 # 4-byte Folded Reload
+; LA32-NEXT: addi.w $sp, $sp, 16
+; LA32-NEXT: ret
+;
+; LA64-LABEL: alloca_callframe:
+; LA64: # %bb.0:
+; LA64-NEXT: addi.d $sp, $sp, -16
+; LA64-NEXT: st.d $ra, $sp, 8 # 8-byte Folded Spill
+; LA64-NEXT: st.d $fp, $sp, 0 # 8-byte Folded Spill
+; LA64-NEXT: addi.d $fp, $sp, 16
+; LA64-NEXT: addi.w $a1, $zero, -16
+; LA64-NEXT: lu32i.d $a1, 1
+; LA64-NEXT: bstrpick.d $a0, $a0, 31, 0
+; LA64-NEXT: addi.d $a0, $a0, 15
+; LA64-NEXT: and $a0, $a0, $a1
+; LA64-NEXT: sub.d $a0, $sp, $a0
+; LA64-NEXT: move $sp, $a0
+; LA64-NEXT: addi.d $sp, $sp, -32
+; LA64-NEXT: ori $a1, $zero, 12
+; LA64-NEXT: st.d $a1, $sp, 24
+; LA64-NEXT: ori $a1, $zero, 11
+; LA64-NEXT: st.d $a1, $sp, 16
+; LA64-NEXT: ori $a1, $zero, 10
+; LA64-NEXT: st.d $a1, $sp, 8
+; LA64-NEXT: ori $a1, $zero, 9
+; LA64-NEXT: st.d $a1, $sp, 0
+; LA64-NEXT: ori $a1, $zero, 2
+; LA64-NEXT: ori $a2, $zero, 3
+; LA64-NEXT: ori $a3, $zero, 4
+; LA64-NEXT: ori $a4, $zero, 5
+; LA64-NEXT: ori $a5, $zero, 6
+; LA64-NEXT: ori $a6, $zero, 7
+; LA64-NEXT: ori $a7, $zero, 8
+; LA64-NEXT: bl %plt(func)
+; LA64-NEXT: addi.d $sp, $sp, 32
+; LA64-NEXT: addi.d $sp, $fp, -16
+; LA64-NEXT: ld.d $fp, $sp, 0 # 8-byte Folded Reload
+; LA64-NEXT: ld.d $ra, $sp, 8 # 8-byte Folded Reload
+; LA64-NEXT: addi.d $sp, $sp, 16
+; LA64-NEXT: ret
+ %1 = alloca i8, i32 %n
+ call void @func(ptr %1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8,
+ i32 9, i32 10, i32 11, i32 12)
+ ret void
+}