[SystemZ] Enable unaligned accesses

[oota-llvm.git] / test / CodeGen / SystemZ / unaligned-01.ll

diff --git a/test/CodeGen/SystemZ/unaligned-01.ll b/test/CodeGen/SystemZ/unaligned-01.ll
new file mode 100644 (file)
index 0000000..be237ac
--- /dev/null
+++ b/test/CodeGen/SystemZ/unaligned-01.ll
@@ -0,0 +1,59 @@
+; Check that unaligned accesses are allowed in general.  We check the
+; few exceptions (like CRL) in their respective test files.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Check that these four byte stores become a single word store.
+define void @f1(i8 *%ptr) {
+; CHECK: f1
+; CHECK: iilf [[REG:%r[0-5]]], 66051
+; CHECK: st [[REG]], 0(%r2)
+; CHECK: br %r14
+  %off1 = getelementptr i8 *%ptr, i64 1
+  %off2 = getelementptr i8 *%ptr, i64 2
+  %off3 = getelementptr i8 *%ptr, i64 3
+  store i8 0, i8 *%ptr
+  store i8 1, i8 *%off1
+  store i8 2, i8 *%off2
+  store i8 3, i8 *%off3
+  ret void
+}
+
+; Check that unaligned 2-byte accesses are allowed.
+define i16 @f2(i16 *%src, i16 *%dst) {
+; CHECK: f2:
+; CHECK: lh %r2, 0(%r2)
+; CHECK: sth %r2, 0(%r3)
+; CHECK: br %r14
+  %val = load i16 *%src, align 1
+  store i16 %val, i16 *%dst, align 1
+  ret i16 %val
+}
+
+; Check that unaligned 4-byte accesses are allowed.
+define i32 @f3(i32 *%src1, i32 *%src2, i32 *%dst) {
+; CHECK: f3:
+; CHECK: l %r2, 0(%r2)
+; CHECK: s %r2, 0(%r3)
+; CHECK: st %r2, 0(%r4)
+; CHECK: br %r14
+  %val1 = load i32 *%src1, align 1
+  %val2 = load i32 *%src2, align 2
+  %sub = sub i32 %val1, %val2
+  store i32 %sub, i32 *%dst, align 1
+  ret i32 %sub
+}
+
+; Check that unaligned 8-byte accesses are allowed.
+define i64 @f4(i64 *%src1, i64 *%src2, i64 *%dst) {
+; CHECK: f4:
+; CHECK: lg %r2, 0(%r2)
+; CHECK: sg %r2, 0(%r3)
+; CHECK: stg %r2, 0(%r4)
+; CHECK: br %r14
+  %val1 = load i64 *%src1, align 1
+  %val2 = load i64 *%src2, align 2
+  %sub = sub i64 %val1, %val2
+  store i64 %sub, i64 *%dst, align 4
+  ret i64 %sub
+}