Add missing test for r275347 "[IPRA] Set callee saved registers to none for local function when IPRA is enabled."

llvm-svn: 275358

1 files changed, 30 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/ipra-local-linkage.ll b/llvm/test/CodeGen/X86/ipra-local-linkage.ll
new file mode 100644
index 00000000000..a394ed3e385
--- /dev/null
+++ b/llvm/test/CodeGen/X86/ipra-local-linkage.ll
@@ -0,0 +1,30 @@
+; RUN: llc < %s | FileCheck %s -check-prefix=NOIPRA
+; RUN: llc -enable-ipra < %s | FileCheck %s
+
+target triple = "x86_64--"
+
+define internal void @foo() norecurse {
+; When IPRA is not enabled R15 will be saved by foo as it is callee saved reg.
+; NOIPRA-LABEL: foo:
+; NOIPRA: pushq	%r15
+; When IPRA is enabled none register should be saved as foo() is local function
+; so we optimize it to save no registers.
+; CHECK-LABEL: foo:
+; CHECK-NOT: pushq %r15
+  call void asm sideeffect "movl	%r14d, %r15d", "~{r15}"()
+  ret void
+}
+
+define void @bar(i32 %X) {
+  call void asm sideeffect "movl  %r12d, $0", "{r15}~{r12}"(i32 %X)
+  ; As R15 is clobbered by foo() when IPRA is enabled value of R15 should be
+  ; saved if register containing orignal value is also getting clobbered
+  ; and reloaded after foo(), here original value is loaded back into R15D after
+  ; call to foo.
+  call void @foo()
+  ; CHECK-LABEL: bar:
+  ; CHECK: callq foo
+  ; CHECK-NEXT: movl  %eax, %r15d
+  call void asm sideeffect "movl  $0, %r12d", "{r15}~{r12}"(i32 %X)
+  ret void
+}