[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, 78 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/SystemZ/int-cmp-38.ll b/llvm/test/CodeGen/SystemZ/int-cmp-38.ll
new file mode 100644
index 00000000000..34707302755
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/int-cmp-38.ll
@@ -0,0 +1,78 @@
+; Test 32-bit comparisons in which the second operand is a PC-relative
+; variable.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+@g = global i32 1
+
+; Check signed comparisons.
+define i32 @f1(i32 %src1) {
+; CHECK: f1:
+; CHECK: crl %r2, g
+; CHECK-NEXT: j{{g?}}l
+; CHECK: br %r14
+entry:
+  %src2 = load i32 *@g
+  %cond = icmp slt i32 %src1, %src2
+  br i1 %cond, label %exit, label %mulb
+mulb:
+  %mul = mul i32 %src1, %src1
+  br label %exit
+exit:
+  %res = phi i32 [ %src1, %entry ], [ %mul, %mulb ]
+  ret i32 %res
+}
+
+; Check unsigned comparisons.
+define i32 @f2(i32 %src1) {
+; CHECK: f2:
+; CHECK: clrl %r2, g
+; CHECK-NEXT: j{{g?}}l
+; CHECK: br %r14
+entry:
+  %src2 = load i32 *@g
+  %cond = icmp ult i32 %src1, %src2
+  br i1 %cond, label %exit, label %mulb
+mulb:
+  %mul = mul i32 %src1, %src1
+  br label %exit
+exit:
+  %res = phi i32 [ %src1, %entry ], [ %mul, %mulb ]
+  ret i32 %res
+}
+
+; Check equality, which can use CRL or CLRL.
+define i32 @f3(i32 %src1) {
+; CHECK: f3:
+; CHECK: c{{l?}}rl %r2, g
+; CHECK-NEXT: j{{g?}}e
+; CHECK: br %r14
+entry:
+  %src2 = load i32 *@g
+  %cond = icmp eq i32 %src1, %src2
+  br i1 %cond, label %exit, label %mulb
+mulb:
+  %mul = mul i32 %src1, %src1
+  br label %exit
+exit:
+  %res = phi i32 [ %src1, %entry ], [ %mul, %mulb ]
+  ret i32 %res
+}
+
+; ...likewise inequality.
+define i32 @f4(i32 %src1) {
+; CHECK: f4:
+; CHECK: c{{l?}}rl %r2, g
+; CHECK-NEXT: j{{g?}}lh
+; CHECK: br %r14
+entry:
+  %src2 = load i32 *@g
+  %cond = icmp ne i32 %src1, %src2
+  br i1 %cond, label %exit, label %mulb
+mulb:
+  %mul = mul i32 %src1, %src1
+  br label %exit
+exit:
+  %res = phi i32 [ %src1, %entry ], [ %mul, %mulb ]
+  ret i32 %res
+}