[Sparc] Correctly handle call to functions with ReturnsTwice attribute.

In sparc, setjmp stores only the registers %fp, %sp, %i7 and %o7. longjmp restores
the stack, and the callee-saved registers (all local/in registers: %i0-%i7, %l0-%l7)
using the stored %fp and register windows. However, this does not guarantee that the longjmp
will restore the registers, as they were when the setjmp was called. This is because these
registers may be clobbered after returning from setjmp, but before calling longjmp.

This patch prevents the registers %i0-%i5, %l0-l7 to live across the setjmp call using the register mask.  

llvm-svn: 190033

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/Sparc/SparcCallingConv.td b/llvm/lib/Target/Sparc/SparcCallingConv.td
index 181165d6ddd..acd4ec21de4 100644
--- a/llvm/lib/Target/Sparc/SparcCallingConv.td
+++ b/llvm/lib/Target/Sparc/SparcCallingConv.td
@@ -123,3 +123,8 @@ def CSR : CalleeSavedRegs<(add)> {
   let OtherPreserved = (add (sequence "I%u", 0, 7),
                             (sequence "L%u", 0, 7));
 }
+
+// Callee-saved registers for calls with ReturnsTwice attribute.
+def RTCSR : CalleeSavedRegs<(add)> {
+  let OtherPreserved = (add I6, I7);
+}