+2001-10-08 Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
+
+ * unroll.c (loop_iterations): Extend check for multiple back edges.
+
2001-10-08 Alexandre Oliva <aoliva@redhat.com>
* langhooks.h: New file.
return 0;
}
+ /* If there are multiple conditionalized loop exit tests, they may jump
+ back to differing CODE_LABELs. */
+ if (loop->top && loop->cont)
+ {
+ rtx temp = PREV_INSN (last_loop_insn);
+
+ do
+ {
+ if (GET_CODE (temp) == JUMP_INSN
+ && INSN_LUID (JUMP_LABEL (temp)) > INSN_LUID (loop->top)
+ && INSN_LUID (JUMP_LABEL (temp)) < INSN_LUID (loop->cont))
+ {
+ if (loop_dump_stream)
+ fprintf (loop_dump_stream,
+ "Loop iterations: Loop has multiple back edges.\n");
+ return 0;
+ }
+ }
+ while ((temp = PREV_INSN (temp)) != loop->cont);
+ }
+
/* Find the iteration variable. If the last insn is a conditional
branch, and the insn before tests a register value, make that the
iteration variable. */