Add test for ARM FastISel load/store register classes

r183624 fixed an issue that was tested indirectly. Test it directly with this new test.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183634 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/ARM/fast-isel-load-store-verify.ll

@@ -0,0 +1,70 @@
+; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios | FileCheck %s --check-prefix=ALL
+; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=armv7-linux-gnueabi | FileCheck %s --check-prefix=ALL
+
+; FIXME Add tests for thumbv7, they currently fail MI verification because
+;       of a mismatch in register classes in uses.
+
+; This test verifies that load/store instructions are properly generated,
+; and that they pass MI verification (wasn't the case until 2013-06-08).
+
+@a = global i8 1, align 1
+@b = global i16 2, align 2
+@c = global i32 4, align 4
+
+; ldr
+
+define i8 @t1() nounwind uwtable ssp {
+; ALL: @t1
+; ALL: ldrb
+; ALL: add
+  %1 = load i8* @a, align 1
+  %2 = add nsw i8 %1, 1
+  ret i8 %2
+}
+
+define i16 @t2() nounwind uwtable ssp {
+; ALL: @t2
+; ALL: ldrh
+; ALL: add
+  %1 = load i16* @b, align 2
+  %2 = add nsw i16 %1, 1
+  ret i16 %2
+}
+
+define i32 @t3() nounwind uwtable ssp {
+; ALL: @t3
+; ALL: ldr
+; ALL: add
+  %1 = load i32* @c, align 4
+  %2 = add nsw i32 %1, 1
+  ret i32 %2
+}
+
+; str
+
+define void @t4(i8 %v) nounwind uwtable ssp {
+; ALL: @t4
+; ALL: add
+; ALL: strb
+  %1 = add nsw i8 %v, 1
+  store i8 %1, i8* @a, align 1
+  ret void
+}
+
+define void @t5(i16 %v) nounwind uwtable ssp {
+; ALL: @t5
+; ALL: add
+; ALL: strh
+  %1 = add nsw i16 %v, 1
+  store i16 %1, i16* @b, align 2
+  ret void
+}
+
+define void @t6(i32 %v) nounwind uwtable ssp {
+; ALL: @t6
+; ALL: add
+; ALL: str
+  %1 = add nsw i32 %v, 1
+  store i32 %1, i32* @c, align 4
+  ret void
+}