[llvm] r275358 - Add missing test for r275347 "[IPRA] Set callee saved registers to none for local function when IPRA is enabled."

[Mehdi Amini via llvm-commits]

Author: mehdi_amini
Date: Wed Jul 13 20:31:20 2016
New Revision: 275358

URL: http://llvm.org/viewvc/llvm-project?rev=275358&view=rev
Log:
Add missing test for r275347 "[IPRA] Set callee saved registers to none for local function when IPRA is enabled."

Added:
    llvm/trunk/test/CodeGen/X86/ipra-local-linkage.ll

Added: llvm/trunk/test/CodeGen/X86/ipra-local-linkage.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/ipra-local-linkage.ll?rev=275358&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/X86/ipra-local-linkage.ll (added)
+++ llvm/trunk/test/CodeGen/X86/ipra-local-linkage.ll Wed Jul 13 20:31:20 2016
@@ -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
+}