AArch64: Add aditional Cyclone macroop fusion opportunities

Related to rdar://19205407

Differential Revision: http://reviews.llvm.org/D10746

llvm-svn: 242724

1 files changed, 34 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/AArch64/misched-fusion.ll b/llvm/test/CodeGen/AArch64/misched-fusion.ll
new file mode 100644
index 00000000000..d3886932903
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/misched-fusion.ll
@@ -0,0 +1,34 @@
+; RUN: llc -o - %s -mcpu=cyclone | FileCheck %s
+target triple = "arm64-apple-ios"
+
+declare void @foobar(i32 %v0, i32 %v1)
+
+; Make sure sub is scheduled in front of cbnz
+; CHECK-LABEL: test_sub_cbz:
+; CHECK: add w[[ADDRES:[0-9]+]], w1, #7
+; CHECK: sub w[[SUBRES:[0-9]+]], w0, #13
+; CHECK-NEXT: cbnz w[[SUBRES]], [[SKIPBLOCK:LBB[0-9_]+]]
+; CHECK: mov x0, x[[ADDRES]]
+; CHECK: mov x1, x[[SUBRES]]
+; CHECK: bl _foobar
+; CHECK: [[SKIPBLOCK]]:
+; CHECK: mov x0, x[[SUBRES]]
+; CHECK: mov x1, x[[ADDRES]]
+; CHECK: bl _foobar
+define void @test_sub_cbz(i32 %a0, i32 %a1) {
+entry:
+  ; except for the fusion opportunity the sub/add should be equal so the
+  ; scheduler would leave them in source order if it weren't for the scheduling
+  %v0 = sub i32 %a0, 13
+  %cond = icmp eq i32 %v0, 0
+  %v1 = add i32 %a1, 7
+  br i1 %cond, label %if, label %exit
+
+if:
+  call void @foobar(i32 %v1, i32 %v0)
+  br label %exit
+
+exit:
+  call void @foobar(i32 %v0, i32 %v1)
+  ret void
+}