[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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181204 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 94 insertions, 0 deletions

diff --git a/test/CodeGen/SystemZ/int-sub-04.ll b/test/CodeGen/SystemZ/int-sub-04.ll
new file mode 100644
index 00000000000..545d3421680
--- /dev/null
+++ b/test/CodeGen/SystemZ/int-sub-04.ll
@@ -0,0 +1,94 @@
+; Test 64-bit subtraction in which the second operand is variable.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Check SGR.
+define i64 @f1(i64 %a, i64 %b) {
+; CHECK: f1:
+; CHECK: sgr %r2, %r3
+; CHECK: br %r14
+  %sub = sub i64 %a, %b
+  ret i64 %sub
+}
+
+; Check SG with no displacement.
+define i64 @f2(i64 %a, i64 *%src) {
+; CHECK: f2:
+; CHECK: sg %r2, 0(%r3)
+; CHECK: br %r14
+  %b = load i64 *%src
+  %sub = sub i64 %a, %b
+  ret i64 %sub
+}
+
+; Check the high end of the aligned SG range.
+define i64 @f3(i64 %a, i64 *%src) {
+; CHECK: f3:
+; CHECK: sg %r2, 524280(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 65535
+  %b = load i64 *%ptr
+  %sub = sub i64 %a, %b
+  ret i64 %sub
+}
+
+; Check the next doubleword up, which needs separate address logic.
+; Other sequences besides this one would be OK.
+define i64 @f4(i64 %a, i64 *%src) {
+; CHECK: f4:
+; CHECK: agfi %r3, 524288
+; CHECK: sg %r2, 0(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 65536
+  %b = load i64 *%ptr
+  %sub = sub i64 %a, %b
+  ret i64 %sub
+}
+
+; Check the high end of the negative aligned SG range.
+define i64 @f5(i64 %a, i64 *%src) {
+; CHECK: f5:
+; CHECK: sg %r2, -8(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 -1
+  %b = load i64 *%ptr
+  %sub = sub i64 %a, %b
+  ret i64 %sub
+}
+
+; Check the low end of the SG range.
+define i64 @f6(i64 %a, i64 *%src) {
+; CHECK: f6:
+; CHECK: sg %r2, -524288(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 -65536
+  %b = load i64 *%ptr
+  %sub = sub i64 %a, %b
+  ret i64 %sub
+}
+
+; Check the next doubleword down, which needs separate address logic.
+; Other sequences besides this one would be OK.
+define i64 @f7(i64 %a, i64 *%src) {
+; CHECK: f7:
+; CHECK: agfi %r3, -524296
+; CHECK: sg %r2, 0(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 -65537
+  %b = load i64 *%ptr
+  %sub = sub i64 %a, %b
+  ret i64 %sub
+}
+
+; Check that SG allows an index.
+define i64 @f8(i64 %a, i64 %src, i64 %index) {
+; CHECK: f8:
+; CHECK: sg %r2, 524280({{%r4,%r3|%r3,%r4}})
+; CHECK: br %r14
+  %add1 = add i64 %src, %index
+  %add2 = add i64 %add1, 524280
+  %ptr = inttoptr i64 %add2 to i64 *
+  %b = load i64 *%ptr
+  %sub = sub i64 %a, %b
+  ret i64 %sub
+}