[Sparc] Add support for leaf functions in sparc backend.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182822 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/SPARC/leafproc.ll

@@ -0,0 +1,57 @@
+; RUN: llc -march=sparc -disable-sparc-leaf-proc=0 < %s | FileCheck %s
+
+; CHECK:      func_nobody:
+; CHECK:      jmp %o7+8
+; CHECK-NEXT: nop
+define void @func_nobody() {
+entry:
+  ret void
+}
+
+
+; CHECK:      return_int_const:
+; CHECK:      jmp %o7+8
+; CHECK-NEXT: or %g0, 1729, %o0
+define i32 @return_int_const() {
+entry:
+  ret i32 1729
+}
+
+; CHECK:      return_double_const:
+; CHECK:      sethi
+; CHECK:      jmp %o7+8
+; CHECK-NEXT: ldd {{.*}}, %f0
+
+define double @return_double_const() {
+entry:
+  ret double 0.000000e+00
+}
+
+; CHECK:      leaf_proc_with_args:
+; CHECK:      add {{%o[0-1]}}, {{%o[0-1]}}, [[R:%[go][0-7]]]
+; CHECK:      jmp %o7+8
+; CHECK-NEXT: add [[R]], %o2, %o0
+
+define i32 @leaf_proc_with_args(i32 %a, i32 %b, i32 %c) {
+entry:
+  %0 = add nsw i32 %b, %a
+  %1 = add nsw i32 %0, %c
+  ret i32 %1
+}
+
+; CHECK:     leaf_proc_with_args_in_stack:
+; CHECK-DAG: ld [%sp+92], {{%[go][0-7]}}
+; CHECK-DAG: ld [%sp+96], {{%[go][0-7]}}
+; CHECK:     jmp %o7+8
+; CHECK-NEXT: add {{.*}}, %o0
+define i32 @leaf_proc_with_args_in_stack(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i32 %h) {
+entry:
+  %0 = add nsw i32 %b, %a
+  %1 = add nsw i32 %0, %c
+  %2 = add nsw i32 %1, %d
+  %3 = add nsw i32 %2, %e
+  %4 = add nsw i32 %3, %f
+  %5 = add nsw i32 %4, %g
+  %6 = add nsw i32 %5, %h
+  ret i32 %6
+}