loop optimization; this broke doloop detection.
From-SVN: r57260
+2002-09-17 Dale Johannesen <dalej@apple.com>
+ * cfgcleanup.c (try_forward_edges): Do not forward a
+ branch to just after a loop exit before loop optimization;
+ this interfered with doloop detection.
+
2002-09-17 Nick Clifton <nickc@redhat.com>
* config/arm/arm.c (output_return_instruction): Do not
* real.h (real_nan): Return bool.
* doc/extend.texi: Document new builtins.
+>>>>>>> 1.15460
2002-09-16 Jason Merrill <jason@redhat.com>
Danny Smith <dannysmith@users.sourceforge.net>
if (GET_CODE (insn) == NOTE)
break;
+
+ /* Do not clean up branches to just past the end of a loop
+ at this time; it can mess up the loop optimizer's
+ recognition of some patterns. */
+
+ insn = PREV_INSN (target->head);
+ if (insn && GET_CODE (insn) == NOTE
+ && NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_END)
+ break;
}
counter++;
--- /dev/null
+/* Make sure both loops are recognized as doloops.
+ If so, "bdnz" will be generated on ppc; if not,
+ you will get "ble". */
+
+/* { dg-do compile { target powerpc-*-* } } */
+/* { dg-options "-O2" } */
+void foo (int count, char* pca, char* pcb) {
+ int i;
+ if (count > 10)
+ for (i = 0; i < count; ++i)
+ pcb += i;
+ else
+ for (i = 0; i < count; ++i)
+ pca += i;
+ *pca = *pcb;
+}
+/* { dg-final { scan-assembler "bdnz" } } */
+/* { dg-final { scan-assembler-not "blt" } } */