1 files changed, 46 insertions, 0 deletions
diff --git a/test/CodeGen/Thumb/stm-scavenging.ll b/test/CodeGen/Thumb/stm-scavenging.ll
new file mode 100644
index 0000000000000..3ed5763f29558
--- /dev/null
+++ b/test/CodeGen/Thumb/stm-scavenging.ll
@@ -0,0 +1,46 @@
+; RUN: llc < %s | FileCheck %s
+target triple = "thumbv6---gnueabi"
+
+; Use STM to save the three registers
+; CHECK-LABEL: use_stm:
+; CHECK: .save   {r7, lr}
+; CHECK: .setfp  r7, sp
+; CHECK: stm r3!, {r0, r1, r2}
+; CHECK: bl throws_1
+define void @use_stm(i32 %a, i32 %b, i32 %c, i32* %d) local_unnamed_addr noreturn "no-frame-pointer-elim"="true" {
+entry:
+  %arrayidx = getelementptr inbounds i32, i32* %d, i32 2
+  store i32 %a, i32* %arrayidx, align 4
+  %arrayidx1 = getelementptr inbounds i32, i32* %d, i32 3
+  store i32 %b, i32* %arrayidx1, align 4
+  %arrayidx2 = getelementptr inbounds i32, i32* %d, i32 4
+  store i32 %c, i32* %arrayidx2, align 4
+  tail call void @throws_1(i32 %a, i32 %b, i32 %c) noreturn
+  unreachable
+}
+
+; Don't use STM: there is no available register to store
+; the address. We could transform this with some extra math, but
+; that currently isn't implemented.
+; CHECK-LABEL: no_stm:
+; CHECK: .save   {r7, lr}
+; CHECK: .setfp  r7, sp
+; CHECK: str r0,
+; CHECK: str r1,
+; CHECK: str r2,
+; CHECK: bl throws_2
+define void @no_stm(i32 %a, i32 %b, i32 %c, i32* %d) local_unnamed_addr noreturn "no-frame-pointer-elim"="true" {
+entry:
+  %arrayidx = getelementptr inbounds i32, i32* %d, i32 2
+  store i32 %a, i32* %arrayidx, align 4
+  %arrayidx1 = getelementptr inbounds i32, i32* %d, i32 3
+  store i32 %b, i32* %arrayidx1, align 4
+  %arrayidx2 = getelementptr inbounds i32, i32* %d, i32 4
+  store i32 %c, i32* %arrayidx2, align 4
+  tail call void @throws_2(i32 %a, i32 %b, i32 %c, i32* %d) noreturn
+  unreachable
+}
+
+
+declare void @throws_1(i32, i32, i32) noreturn
+declare void @throws_2(i32, i32, i32, i32*) noreturn