[SROA] Add test for #64081 (NFC)

Author: nikic

llvm/test/Transforms/SROA/pr64081.ll

@@ -0,0 +1,33 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; RUN: opt -S -passes=sroa < %s | FileCheck %s
+
+%B = type { i1, i3 }
+
+; FIXME: This is a miscompile.
+define void @test(i7 %x) {
+; CHECK-LABEL: define void @test(
+; CHECK-SAME: i7 [[X:%.*]]) {
+; CHECK-NEXT:  bb:
+; CHECK-NEXT:    [[RES:%.*]] = alloca [2 x i8], align 1
+; CHECK-NEXT:    [[TMP_SROA_1:%.*]] = alloca i3, align 1
+; CHECK-NEXT:    store i7 [[X]], ptr [[TMP_SROA_1]], align 1
+; CHECK-NEXT:    store i1 undef, ptr [[RES]], align 1
+; CHECK-NEXT:    [[TMP_SROA_1_0_RES_SROA_IDX:%.*]] = getelementptr inbounds i8, ptr [[RES]], i64 1
+; CHECK-NEXT:    [[TMP_SROA_1_0_TMP_SROA_1_0_COPYLOAD:%.*]] = load i3, ptr [[TMP_SROA_1]], align 1
+; CHECK-NEXT:    store i3 [[TMP_SROA_1_0_TMP_SROA_1_0_COPYLOAD]], ptr [[TMP_SROA_1_0_RES_SROA_IDX]], align 1
+; CHECK-NEXT:    [[TMP0:%.*]] = call i8 @use(ptr [[RES]])
+; CHECK-NEXT:    ret void
+;
+bb:
+  %res = alloca [2 x i8]
+  %tmp = alloca { i1, i3 }
+  %tmp.1 = getelementptr i8, ptr %tmp, i64 1
+  store i7 %x, ptr %tmp.1
+  call void @llvm.memcpy.p0.p0.i64(ptr %res, ptr %tmp, i64 2, i1 false)
+  call i8 @use(ptr %res)
+  ret void
+}
+
+declare void @use(ptr)
+
+declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg)