[SystemZ] Add CodeGen test cases

This adds all CodeGen tests for the SystemZ target.

This version of the patch incorporates feedback from a review by
Sean Silva.  Thanks to all reviewers!

Patch by Richard Sandiford.

llvm-svn: 181204

1 files changed, 98 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/SystemZ/cmpxchg-04.ll b/llvm/test/CodeGen/SystemZ/cmpxchg-04.ll
new file mode 100644
index 00000000000..f8969ee0844
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/cmpxchg-04.ll
@@ -0,0 +1,98 @@
+; Test 64-bit compare and swap.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Check CSG without a displacement.
+define i64 @f1(i64 %cmp, i64 %swap, i64 *%src) {
+; CHECK: f1:
+; CHECK: csg %r2, %r3, 0(%r4)
+; CHECK: br %r14
+  %val = cmpxchg i64 *%src, i64 %cmp, i64 %swap seq_cst
+  ret i64 %val
+}
+
+; Check the high end of the aligned CSG range.
+define i64 @f2(i64 %cmp, i64 %swap, i64 *%src) {
+; CHECK: f2:
+; CHECK: csg %r2, %r3, 524280(%r4)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 65535
+  %val = cmpxchg i64 *%ptr, i64 %cmp, i64 %swap seq_cst
+  ret i64 %val
+}
+
+; Check the next doubleword up, which needs separate address logic.
+; Other sequences besides this one would be OK.
+define i64 @f3(i64 %cmp, i64 %swap, i64 *%src) {
+; CHECK: f3:
+; CHECK: agfi %r4, 524288
+; CHECK: csg %r2, %r3, 0(%r4)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 65536
+  %val = cmpxchg i64 *%ptr, i64 %cmp, i64 %swap seq_cst
+  ret i64 %val
+}
+
+; Check the high end of the negative aligned CSG range.
+define i64 @f4(i64 %cmp, i64 %swap, i64 *%src) {
+; CHECK: f4:
+; CHECK: csg %r2, %r3, -8(%r4)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 -1
+  %val = cmpxchg i64 *%ptr, i64 %cmp, i64 %swap seq_cst
+  ret i64 %val
+}
+
+; Check the low end of the CSG range.
+define i64 @f5(i64 %cmp, i64 %swap, i64 *%src) {
+; CHECK: f5:
+; CHECK: csg %r2, %r3, -524288(%r4)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 -65536
+  %val = cmpxchg i64 *%ptr, i64 %cmp, i64 %swap seq_cst
+  ret i64 %val
+}
+
+; Check the next doubleword down, which needs separate address logic.
+; Other sequences besides this one would be OK.
+define i64 @f6(i64 %cmp, i64 %swap, i64 *%src) {
+; CHECK: f6:
+; CHECK: agfi %r4, -524296
+; CHECK: csg %r2, %r3, 0(%r4)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 -65537
+  %val = cmpxchg i64 *%ptr, i64 %cmp, i64 %swap seq_cst
+  ret i64 %val
+}
+
+; Check that CSG does not allow an index.
+define i64 @f7(i64 %cmp, i64 %swap, i64 %src, i64 %index) {
+; CHECK: f7:
+; CHECK: agr %r4, %r5
+; CHECK: csg %r2, %r3, 0(%r4)
+; CHECK: br %r14
+  %add1 = add i64 %src, %index
+  %ptr = inttoptr i64 %add1 to i64 *
+  %val = cmpxchg i64 *%ptr, i64 %cmp, i64 %swap seq_cst
+  ret i64 %val
+}
+
+; Check that a constant %cmp value is loaded into a register first.
+define i64 @f8(i64 %dummy, i64 %swap, i64 *%ptr) {
+; CHECK: f8:
+; CHECK: lghi %r2, 1001
+; CHECK: csg %r2, %r3, 0(%r4)
+; CHECK: br %r14
+  %val = cmpxchg i64 *%ptr, i64 1001, i64 %swap seq_cst
+  ret i64 %val
+}
+
+; Check that a constant %swap value is loaded into a register first.
+define i64 @f9(i64 %cmp, i64 *%ptr) {
+; CHECK: f9:
+; CHECK: lghi [[SWAP:%r[0-9]+]], 1002
+; CHECK: csg %r2, [[SWAP]], 0(%r3)
+; CHECK: br %r14
+  %val = cmpxchg i64 *%ptr, i64 %cmp, i64 1002 seq_cst
+  ret i64 %val
+}