ifcvt.c (cond_exec_process_insns): Disallow converting a block that contains the prologue.

	* ifcvt.c (cond_exec_process_insns): Disallow converting a block
	that contains the prologue.

	* gcc.c-torture/compile/20110401-1.c: New test.

From-SVN: r171840

gcc/ChangeLog

@@ -7,6 +7,9 @@
 	* final.c (final_start_function): Call the new function rather
 	than using a NULL argument for dwarf2out_frame_debug.
 
+	* ifcvt.c (cond_exec_process_insns): Disallow converting a block
+	that contains the prologue.
+
 2011-04-01  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
 
 	* config/spu/t-spu-elf (dp-bit.c): Use > instead of >>.

gcc/ifcvt.c

 /* If-conversion support.
-   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010
+   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010,
+   2011
    Free Software Foundation, Inc.
 
    This file is part of GCC.
@@ -304,6 +305,10 @@ cond_exec_process_insns (ce_if_block_t *ce_info ATTRIBUTE_UNUSED,
 
   for (insn = start; ; insn = NEXT_INSN (insn))
     {
+      /* dwarf2out can't cope with conditional prologues.  */
+      if (NOTE_P (insn) && NOTE_KIND (insn) == NOTE_INSN_PROLOGUE_END)
+	return FALSE;
+
       if (NOTE_P (insn) || DEBUG_INSN_P (insn))
 	goto insn_done;
 

gcc/testsuite/ChangeLog

+2011-04-01  Bernd Schmidt  <bernds@codesourcery.com>
+
+	* gcc.c-torture/compile/20110401-1.c: New test.
+
 2011-03-31  Ian Lance Taylor  <iant@google.com>
 
 	* go.test/go-test.exp (go-set-goarch): Recognize MIPS ABIs.

gcc/testsuite/gcc.c-torture/compile/20110401-1.c

+void asn1_length_der (unsigned long int len, unsigned char *ans, int *ans_len)
+{
+    int k;
+    unsigned char temp[4];
+    if (len < 128) {
+	if (ans != ((void *) 0))
+	    ans[0] = (unsigned char) len;
+	*ans_len = 1;
+    } else {
+	k = 0;
+	while (len) {
+	    temp[k++] = len & 0xFF;
+	    len = len >> 8;
+	}
+	*ans_len = k + 1;
+	if (ans != ((void *) 0)) {
+	    ans[0] = ((unsigned char) k & 0x7F) + 128;
+	    while (k--)
+		ans[*ans_len - 1 - k] = temp[k];
+	}
+    }
+}