[PowerPC][NFC] Add a TOC save test case prior to posting a related patch

An upcoming patch will modify the behaviour with respect to saving the TOC
in functions with indirect calls.
Adding a test case so the patch will show the difference in codegen.

llvm-svn: 364375

llvm/test/CodeGen/PowerPC/tocSaveInPrologue.ll

@@ -0,0 +1,68 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mcpu=pwr8 -ppc-asm-full-reg-names \
+; RUN:   -mtriple=powerpc64le-unknown-unknown < %s | FileCheck %s
+define dso_local void @test(void (i32)* nocapture %fp, i32 signext %Arg, i32 signext %Len) local_unnamed_addr #0 {
+; CHECK-LABEL: test:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    mflr r0
+; CHECK-NEXT:    .cfi_def_cfa_offset 64
+; CHECK-NEXT:    .cfi_offset lr, 16
+; CHECK-NEXT:    .cfi_offset r28, -32
+; CHECK-NEXT:    .cfi_offset r29, -24
+; CHECK-NEXT:    .cfi_offset r30, -16
+; CHECK-NEXT:    std r28, -32(r1) # 8-byte Folded Spill
+; CHECK-NEXT:    std r29, -24(r1) # 8-byte Folded Spill
+; CHECK-NEXT:    std r30, -16(r1) # 8-byte Folded Spill
+; CHECK-NEXT:    std r0, 16(r1)
+; CHECK-NEXT:    stdu r1, -64(r1)
+; CHECK-NEXT:    mr r29, r5
+; CHECK-NEXT:    cmpwi cr1, r4, 11
+; CHECK-NEXT:    mr r30, r3
+; CHECK-NEXT:    extsw r28, r4
+; CHECK-NEXT:    cmpwi r29, 1
+; CHECK-NEXT:    cror 4*cr5+lt, lt, 4*cr1+lt
+; CHECK-NEXT:    bc 12, 4*cr5+lt, .LBB0_3
+; CHECK-NEXT:  # %bb.1: # %for.body.us.preheader
+; CHECK-NEXT:    std r2, 24(r1)
+; CHECK-NEXT:    .p2align 5
+; CHECK-NEXT:  .LBB0_2: # %for.body.us
+; CHECK-NEXT:  
+; CHECK-NEXT:    mtctr r30
+; CHECK-NEXT:    mr r3, r28
+; CHECK-NEXT:    mr r12, r30
+; CHECK-NEXT:    bctrl
+; CHECK-NEXT:    ld 2, 24(r1)
+; CHECK-NEXT:    addi r29, r29, -1
+; CHECK-NEXT:    cmplwi r29, 0
+; CHECK-NEXT:    bne cr0, .LBB0_2
+; CHECK-NEXT:  .LBB0_3: # %for.cond.cleanup
+; CHECK-NEXT:    mtctr r30
+; CHECK-NEXT:    mr r3, r28
+; CHECK-NEXT:    mr r12, r30
+; CHECK-NEXT:    std r2, 24(r1)
+; CHECK-NEXT:    bctrl
+; CHECK-NEXT:    ld 2, 24(r1)
+; CHECK-NEXT:    addi r1, r1, 64
+; CHECK-NEXT:    ld r0, 16(r1)
+; CHECK-NEXT:    mtlr r0
+; CHECK-NEXT:    ld r30, -16(r1) # 8-byte Folded Reload
+; CHECK-NEXT:    ld r29, -24(r1) # 8-byte Folded Reload
+; CHECK-NEXT:    ld r28, -32(r1) # 8-byte Folded Reload
+; CHECK-NEXT:    blr
+entry:
+  %cmp7 = icmp sgt i32 %Len, 0
+  %cmp1 = icmp sgt i32 %Arg, 10
+  %or.cond = and i1 %cmp7, %cmp1
+  br i1 %or.cond, label %for.body.us, label %for.cond.cleanup
+
+for.body.us:                                      ; preds = %entry, %for.body.us
+  %i.08.us = phi i32 [ %inc.us, %for.body.us ], [ 0, %entry ]
+  tail call void %fp(i32 signext %Arg) #1
+  %inc.us = add nuw nsw i32 %i.08.us, 1
+  %exitcond = icmp eq i32 %inc.us, %Len
+  br i1 %exitcond, label %for.cond.cleanup, label %for.body.us
+
+for.cond.cleanup:                                 ; preds = %for.body.us, %entry
+  tail call void %fp(i32 signext %Arg) #1
+  ret void
+}