[SystemZ] Try reversing comparisons whose first operand is in memory
This allows us to make more use of the many compare reg,mem instructions.
llvm-svn: 189099
diff --git a/llvm/test/CodeGen/SystemZ/int-cmp-38.ll b/llvm/test/CodeGen/SystemZ/int-cmp-38.ll
index d5a852c..9017583 100644
--- a/llvm/test/CodeGen/SystemZ/int-cmp-38.ll
+++ b/llvm/test/CodeGen/SystemZ/int-cmp-38.ll
@@ -115,3 +115,21 @@
%res = phi i32 [ %src1, %entry ], [ %mul, %mulb ]
ret i32 %res
}
+
+; Check the comparison can be reversed if that allows CRL to be used.
+define i32 @f7(i32 %src2) {
+; CHECK-LABEL: f7:
+; CHECK: crl %r2, g
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %src1 = load i32 *@g
+ %cond = icmp slt i32 %src1, %src2
+ br i1 %cond, label %exit, label %mulb
+mulb:
+ %mul = mul i32 %src2, %src2
+ br label %exit
+exit:
+ %res = phi i32 [ %src2, %entry ], [ %mul, %mulb ]
+ ret i32 %res
+}