Add __builtin_setjmp/_longjmp supprt in X86 backend

- Besides used in SjLj exception handling, __builtin_setjmp/__longjmp is also
  used as a light-weight replacement of setjmp/longjmp which are used to
  implementation continuation, user-level threading, and etc. The support added
  in this patch ONLY addresses this usage and is NOT intended to support SjLj
  exception handling as zero-cost DWARF exception handling is used by default
  in X86.

llvm-svn: 165989

1 files changed, 27 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86InstrCompiler.td b/llvm/lib/Target/X86/X86InstrCompiler.td
index f27b6f7f53a..9e6f27988f7 100644
--- a/llvm/lib/Target/X86/X86InstrCompiler.td
+++ b/llvm/lib/Target/X86/X86InstrCompiler.td
@@ -165,6 +165,33 @@ def EH_RETURN64   : I<0xC3, RawFrm, (outs), (ins GR64:$addr),
 
 }
 
+let hasSideEffects = 1, isBarrier = 1, isCodeGenOnly = 1,
+    usesCustomInserter = 1 in {
+  def EH_SjLj_SetJmp32  : I<0, Pseudo, (outs GR32:$dst), (ins i32mem:$buf),
+                            "#EH_SJLJ_SETJMP32",
+                            [(set GR32:$dst, (X86eh_sjlj_setjmp addr:$buf))]>,
+                          Requires<[In32BitMode]>;
+  def EH_SjLj_SetJmp64  : I<0, Pseudo, (outs GR32:$dst), (ins i64mem:$buf),
+                            "#EH_SJLJ_SETJMP64",
+                            [(set GR32:$dst, (X86eh_sjlj_setjmp addr:$buf))]>,
+                          Requires<[In64BitMode]>;
+  let isTerminator = 1 in {
+  def EH_SjLj_LongJmp32 : I<0, Pseudo, (outs), (ins i32mem:$buf),
+                            "#EH_SJLJ_LONGJMP32",
+                            [(X86eh_sjlj_longjmp addr:$buf)]>,
+                          Requires<[In32BitMode]>;
+  def EH_SjLj_LongJmp64 : I<0, Pseudo, (outs), (ins i64mem:$buf),
+                            "#EH_SJLJ_LONGJMP64",
+                            [(X86eh_sjlj_longjmp addr:$buf)]>,
+                          Requires<[In64BitMode]>;
+  }
+}
+
+let isBranch = 1, isTerminator = 1, isCodeGenOnly = 1 in {
+  def EH_SjLj_Setup : I<0, Pseudo, (outs), (ins brtarget:$dst),
+                        "#EH_SjLj_Setup\t$dst", []>;
+}
+
 //===----------------------------------------------------------------------===//
 // Pseudo instructions used by segmented stacks.
 //