[Sparc] Disable tail call optimization for sparc64.

This patch fixes PR17506.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192294 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Sparc/SparcISelLowering.cpp b/lib/Target/Sparc/SparcISelLowering.cpp
index ef215390020444e4d49d1bfbe42de0fa752bd6f8..c2e16fc21996615daf5c97167ea10e7d3a8ec861 100644 (file)
--- a/lib/Target/Sparc/SparcISelLowering.cpp
+++ b/lib/Target/Sparc/SparcISelLowering.cpp
@@ -1035,6 +1035,9 @@ SparcTargetLowering::LowerCall_64(TargetLowering::CallLoweringInfo &CLI,
   SDLoc DL = CLI.DL;
   SDValue Chain = CLI.Chain;
 
+  // Sparc target does not yet support tail call optimization.
+  CLI.IsTailCall = false;
+
   // Analyze operands of the call, assigning locations to each operand.
   SmallVector<CCValAssign, 16> ArgLocs;
   CCState CCInfo(CLI.CallConv, CLI.IsVarArg, DAG.getMachineFunction(),

diff --git a/test/CodeGen/SPARC/2011-01-11-Call.ll b/test/CodeGen/SPARC/2011-01-11-Call.ll
index 7350e9232428946e6c696fa98ebf2e6566b630c8..a0f478e119a3efa50c7bbd1ec5b1922c850d6906 100644 (file)
--- a/test/CodeGen/SPARC/2011-01-11-Call.ll
+++ b/test/CodeGen/SPARC/2011-01-11-Call.ll
@@ -1,4 +1,24 @@
 ; RUN: llc -march=sparc -O0 <%s
+; RUN: llc -march=sparc   <%s | FileCheck %s --check-prefix=V8
+; RUN: llc -march=sparcv9 <%s | FileCheck %s --check-prefix=V9
+
+; V8-LABEL: test
+; V8:       save %sp
+; V8:       call foo
+; V8-NEXT:  nop
+; V8:       call bar
+; V8-NEXT:  nop
+; V8:       jmp %i7+8
+; V8-NEXT:  restore
+
+; V9-LABEL: test
+; V9:       save %sp
+; V9:       call foo
+; V9-NEXT:  nop
+; V9:       call bar
+; V9-NEXT:  nop
+; V9:       jmp %i7+8
+; V9-NEXT:  restore
 
 define void @test() nounwind {
 entry:
@@ -11,3 +31,23 @@ declare i32 @foo(...)
 
 declare void @bar(...)
 
+
+; V8-LABEL: test_tail_call_with_return
+; V8:       save %sp
+; V8:       call foo
+; V8-NEXT:  nop
+; V8:       jmp %i7+8
+; V8-NEXT:  restore %g0, %o0, %o0
+
+; V9-LABEL: test_tail_call_with_return
+; V9:       save %sp
+; V9:       call foo
+; V9-NEXT:  nop
+; V9:       jmp %i7+8
+; V9-NEXT:  restore %g0, %o0, %o0
+
+define i32 @test_tail_call_with_return() nounwind {
+entry:
+ %0 = tail call i32 (...)* @foo() nounwind
+ ret i32 %0
+}