add a default cpu test case

llvm/test/CodeGen/PowerPC/llc_default_cpu.ll

@@ -0,0 +1,67 @@
+; Test that the default CPU for the triple powerpc64-unknown-linux-gnu is ppc64.
+; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -frame-pointer=all -mcpu=ppc | FileCheck %s -check-prefixes=LNX-PPC,LNX-COM
+; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -frame-pointer=all | FileCheck %s -check-prefixes=LNX-PPC64,LNX-COM
+; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -frame-pointer=all -mcpu=ppc64 | FileCheck %s -check-prefixes=LNX-PPC64,LNX-COM
+
+; Test that the default CPU for the AIX OS is pwr7.
+; RUN: llc < %s -mtriple=powerpc-ibm-aix-xcoff -mcpu=ppc | FileCheck %s -check-prefixes=AIX-PPC,AIX-COM
+; RUN: llc < %s -mtriple=powerpc-ibm-aix-xcoff -mcpu=pwr7 | FileCheck %s -check-prefixes=AIX-PWR7,AIX-COM
+; RUN: llc < %s -mtriple=powerpc-ibm-aix-xcoff | FileCheck %s -check-prefixes=AIX-PWR7,AIX-COM
+
+; RUN: llc < %s -mtriple=powerpc64-ibm-aix-xcoff -mcpu=ppc | FileCheck %s -check-prefixes=AIX64-PPC,AIX64-COM-NEXT
+; RUN: llc < %s -mtriple=powerpc64-ibm-aix-xcoff -mcpu=pwr7 | FileCheck %s -check-prefixes=AIX64-PWR7,AIX64-COM-NEXT
+; RUN: llc < %s -mtriple=powerpc64-ibm-aix-xcoff | FileCheck %s -check-prefixes=AIX64-PWR7,AIX64-COM-NEXT
+
+define i32 @main() {
+entry:
+  %retval = alloca i32, i32 8191, align 4
+  store i32 0, ptr %retval, align 4
+  ret i32 0
+}
+
+;        LNX-COM: .Lfunc_begin0:
+;   LNX-COM-NEXT:      .cfi_startproc
+;   LNX-COM-NEXT: # %bb.0:                                # %entry
+;   LNX-COM-NEXT:      lis 0, -1
+;   LNX-PPC-NEXT:      ori 0, 0, 32704
+;   LNX-PPC-NEXT:      std 31, -8(1)
+; LNX-PPC64-NEXT:      std 31, -8(1)
+; LNX-PPC64-NEXT:      ori 0, 0, 32704
+;   LNX-COM-NEXT:      stdux 1, 1, 0
+;   LNX-COM-NEXT:      .cfi_def_cfa_offset 32832
+;   LNX-COM-NEXT:      .cfi_offset r31, -8
+;   LNX-COM-NEXT:      mr      31, 1
+;   LNX-COM-NEXT:      .cfi_def_cfa_register r31
+;   LNX-COM-NEXT:      li 4, 0
+;   LNX-COM-NEXT:      li 3, 0
+;   LNX-COM-NEXT:      stw 4, 60(31)
+;   LNX-COM-NEXT:      ld 1, 0(1)
+;   LNX-COM-NEXT:      ld 31, -8(1)
+;   LNX-COM-NEXT:      blr
+;   LNX-COM-NEXT:      .long   0
+;   LNX-COM-NEXT:      .quad   0
+;   LNX-COM-NEXT: .Lfunc_end0:
+
+;       AIX-COM: .main:
+;  AIX-COM-NEXT: # %bb.0:                                # %entry
+;  AIX-COM-NEXT:      lis 0, -1
+;  AIX-COM-NEXT:      ori 0, 0, 32736
+;  AIX-COM-NEXT:      stwux 1, 1, 0
+;  AIX-PPC-NEXT:      li 4, 0
+;  AIX-COM-NEXT:      li 3, 0
+;  AIX-PPC-NEXT:      stw 4, 36(1)
+; AIX-PWR7-NEXT:      stw 3, 36(1)
+;  AIX-COM-NEXT:      lwz 1, 0(1)
+;  AIX-COM-NEXT:      blr
+
+;       AIX64-COM: .main:
+;  AIX64-COM-NEXT: # %bb.0:                                # %entry
+;  AIX64-COM-NEXT:    lis 0, -1
+;  AIX64-COM-NEXT:    ori 0, 0, 32720
+;  AIX64-COM-NEXT:    stdux 1, 1, 0
+;  AIX64-PPC-NEXT:    li 4, 0
+;  AIX64-COM-NEXT:    li 3, 0
+;  AIX64-PPC-NEXT:    stw 4, 52(1)
+; AIX64-PWR7-NEXT:    stw 3, 52(1)
+;  AIX64-COM-NEXT:    ld 1, 0(1)
+;  AIX64-COM-NEXT:    blr