[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-02.ll b/llvm/test/CodeGen/SystemZ/int-cmp-02.ll
index 26e1391..4a8a1a9 100644
--- a/llvm/test/CodeGen/SystemZ/int-cmp-02.ll
+++ b/llvm/test/CodeGen/SystemZ/int-cmp-02.ll
@@ -181,3 +181,16 @@
while.end:
ret void
}
+
+; Check the comparison can be reversed if that allows C to be used.
+define double @f13(double %a, double %b, i32 %i2, i32 *%ptr) {
+; CHECK-LABEL: f13:
+; CHECK: c %r2, 0(%r3)
+; CHECK-NEXT: jh {{\.L.*}}
+; CHECK: ldr %f0, %f2
+; CHECK: br %r14
+ %i1 = load i32 *%ptr
+ %cond = icmp slt i32 %i1, %i2
+ %res = select i1 %cond, double %a, double %b
+ ret double %res
+}