Avoid scheduling builtin setjmp receivers

From-SVN: r39515

Avoid scheduling builtin setjmp receivers
From-SVN: r39515
bcd7edfe · Bernd Schmidt · Bernd Schmidt · b3eda2ff · bcd7edfe · bcd7edfe
Commit bcd7edfe authored 24 years ago by Bernd Schmidt Committed by Bernd Schmidt 24 years ago
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gcc/ChangeLog
+5 -0

gcc/builtins.c
+7 -0

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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
+2001-02-07  Bernd Schmidt  <bernds@redhat.com>
+
+	* builtins.c (expand_builtin_setjmp_receiver): Emit an ASM_INPUT as
+	a scheduling barrier at the end.
+
 2001-02-07  Alexandre Oliva  <aoliva@redhat.com>

 	* config/sh/sh.md (reload_outsf): Removed.

--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -581,6 +581,13 @@ expand_builtin_setjmp_receiver (receiver_label)
    else
 #endif
      { /* Nothing */ }
+
+  /* @@@ This is a kludge.  Not all machine descriptions define a blockage
+     insn, but we must not allow the code we just generated to be reordered
+     by scheduling.  Specifically, the update of the frame pointer must
+     happen immediately, not later.  So emit an ASM_INPUT to act as blockage
+     insn.  */
+  emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
 }

 /* __builtin_setjmp is passed a pointer to an array of five words (not