int num_clobbers_to_add = 0;
int i;
rtx notes = 0;
- rtx old_notes;
+ rtx dummy_insn;
/* If PAT is a PARALLEL, check to see if it contains the CLOBBER
we use to indicate that something didn't match. If we find such a
&& XEXP (XVECEXP (pat, 0, i), 0) == const0_rtx)
return -1;
- /* Remove the old notes prior to trying to recognize the new pattern. */
- old_notes = REG_NOTES (insn);
- REG_NOTES (insn) = 0;
+ /* *pnewpat does not have to be actual PATTERN (insn), so make a dummy
+ instruction for pattern recognition. */
+ dummy_insn = shallow_copy_rtx (insn);
+ PATTERN (dummy_insn) = pat;
+ REG_NOTES (dummy_insn) = 0;
- insn_code_number = recog (pat, insn, &num_clobbers_to_add);
+ insn_code_number = recog (pat, dummy_insn, &num_clobbers_to_add);
/* If it isn't, there is the possibility that we previously had an insn
that clobbered some register as a side effect, but the combined
if (pos == 1)
pat = XVECEXP (pat, 0, 0);
- insn_code_number = recog (pat, insn, &num_clobbers_to_add);
+ PATTERN (dummy_insn) = pat;
+ insn_code_number = recog (pat, dummy_insn, &num_clobbers_to_add);
}
/* Recognize all noop sets, these will be killed by followup pass. */
if (insn_code_number < 0 && GET_CODE (pat) == SET && set_noop_p (pat))
insn_code_number = NOOP_MOVE_INSN_CODE, num_clobbers_to_add = 0;
- REG_NOTES (insn) = old_notes;
-
/* If we had any clobbers to add, make a new pattern than contains
them. Then check to make sure that all of them are dead. */
if (num_clobbers_to_add)
--- /dev/null
+/* This testcase failed because recog_for_combine used to pass a different
+ pattern than contained in insn to recog. */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fssa -fssa-ccp" } */
+/* { dg-options "-O2 -march=i686 -fssa -fssa-ccp" { target i?86-*-* } } */
+
+extern int bar (char *);
+
+int
+foo (void)
+{
+ char b[512];
+
+ bar (b);
+ return __builtin_strlen (b);
+}