1 files changed, 48 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/2015-01-21-thumbv4t-ldstr-opt.ll b/test/CodeGen/ARM/2015-01-21-thumbv4t-ldstr-opt.ll
new file mode 100644
index 0000000..de2dead
--- /dev/null
+++ b/test/CodeGen/ARM/2015-01-21-thumbv4t-ldstr-opt.ll
@@ -0,0 +1,48 @@
+; RUN: llc -mtriple=thumbv4t-none--eabi < %s | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-V4T
+; RUN: llc -mtriple=thumbv6m-none--eabi < %s | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-V6M
+
+; CHECK-LABEL: test1
+define i32 @test1(i32* %p) {
+
+; Offsets less than 8 can be generated in a single add
+; CHECK: adds [[NEWBASE:r[0-9]]], r0, #4
+  %1 = getelementptr inbounds i32* %p, i32 1
+  %2 = getelementptr inbounds i32* %p, i32 2
+  %3 = getelementptr inbounds i32* %p, i32 3
+  %4 = getelementptr inbounds i32* %p, i32 4
+
+; CHECK-NEXT: ldm [[NEWBASE]],
+  %5 = load i32* %1, align 4
+  %6 = load i32* %2, align 4
+  %7 = load i32* %3, align 4
+  %8 = load i32* %4, align 4
+
+  %9 = add nsw i32 %5, %6
+  %10 = add nsw i32 %9, %7
+  %11 = add nsw i32 %10, %8
+  ret i32 %11
+}
+
+; CHECK-LABEL: test2
+define i32 @test2(i32* %p) {
+
+; Offsets >=8 require a mov and an add
+; CHECK-V4T:  movs [[NEWBASE:r[0-9]]], r0
+; CHECK-V6M:  mov [[NEWBASE:r[0-9]]], r0
+; CHECK-NEXT: adds [[NEWBASE]], #8
+  %1 = getelementptr inbounds i32* %p, i32 2
+  %2 = getelementptr inbounds i32* %p, i32 3
+  %3 = getelementptr inbounds i32* %p, i32 4
+  %4 = getelementptr inbounds i32* %p, i32 5
+
+; CHECK-NEXT: ldm [[NEWBASE]],
+  %5 = load i32* %1, align 4
+  %6 = load i32* %2, align 4
+  %7 = load i32* %3, align 4
+  %8 = load i32* %4, align 4
+
+  %9 = add nsw i32 %5, %6
+  %10 = add nsw i32 %9, %7
+  %11 = add nsw i32 %10, %8
+  ret i32 %11
+}