Add several testcases for new optimizations in the code generator.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19244 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 21 insertions, 0 deletions

diff --git a/test/CodeGen/X86/commute-two-addr.ll b/test/CodeGen/X86/commute-two-addr.ll
new file mode 100644
index 0000000000..860c159790
--- /dev/null
+++ b/test/CodeGen/X86/commute-two-addr.ll
@@ -0,0 +1,21 @@
+; The register allocator can commute two-address instructions to avoid
+; insertion of register-register copies.
+
+; Check that there are no register-register copies left.
+; RUN: llvm-as < %s | llc -march=x86 -x86-asm-syntax=intel | not grep 'mov %E.X, %E.X'
+
+%G = external global int
+
+declare void %ext(int)
+
+int %add_test(int %X, int %Y) {
+	%Z = add int %X, %Y      ;; Last use of Y, but not of X.
+	store int %Z, int* %G
+	ret int %X
+}
+
+int %xor_test(int %X, int %Y) {
+	%Z = xor int %X, %Y      ;; Last use of Y, but not of X.
+	store int %Z, int* %G
+	ret int %X
+}