[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-08.ll b/llvm/test/CodeGen/SystemZ/int-cmp-08.ll
index e68a0fe..b6f48d3 100644
--- a/llvm/test/CodeGen/SystemZ/int-cmp-08.ll
+++ b/llvm/test/CodeGen/SystemZ/int-cmp-08.ll
@@ -116,3 +116,16 @@
%res = select i1 %cond, double %a, double %b
ret double %res
}
+
+; Check the comparison can be reversed if that allows CLG to be used.
+define double @f9(double %a, double %b, i64 %i2, i64 *%ptr) {
+; CHECK-LABEL: f9:
+; CHECK: clg %r2, 0(%r3)
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: ldr %f0, %f2
+; CHECK: br %r14
+ %i1 = load i64 *%ptr
+ %cond = icmp ult i64 %i1, %i2
+ %res = select i1 %cond, double %a, double %b
+ ret double %res
+}