The following patch PR61325. The details can be found on
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61325
The patch was bootstrapped and tested on x86/x86-64.
Committed as rev. 211060 to gcc-4.9 branch and as rev.211061 to trunk.
2014-05-29 Vladimir Makarov <vmaka...@redhat.com>
PR rtl-optimization/61325
* lra-constraints.c (process_address): Rename to
process_address_1.
(process_address): New function.
2014-05-29 Vladimir Makarov <vmaka...@redhat.com>
PR rtl-optimization/61325
* gcc.target/aarch64/pr61325.c: New.
Index: lra-constraints.c
===================================================================
--- lra-constraints.c (revision 210973)
+++ lra-constraints.c (working copy)
@@ -2784,9 +2784,14 @@
Add reloads to the lists *BEFORE and *AFTER. We might need to add
reloads to *AFTER because of inc/dec, {pre, post} modify in the
- address. Return true for any RTL change. */
+ address. Return true for any RTL change.
+
+ The function is a helper function which does not produce all
+ transformations which can be necessary. It does just basic steps.
+ To do all necessary transformations use function
+ process_address. */
static bool
-process_address (int nop, rtx *before, rtx *after)
+process_address_1 (int nop, rtx *before, rtx *after)
{
struct address_info ad;
rtx new_reg;
@@ -2986,6 +2991,18 @@
return true;
}
+/* Do address reloads until it is necessary. Use process_address_1 as
+ a helper function. Return true for any RTL changes. */
+static bool
+process_address (int nop, rtx *before, rtx *after)
+{
+ bool res = false;
+
+ while (process_address_1 (nop, before, after))
+ res = true;
+ return res;
+}
+
/* Emit insns to reload VALUE into a new register. VALUE is an
auto-increment or auto-decrement RTX whose operand is a register or
memory location; so reloading involves incrementing that location.
@@ -3270,7 +3287,7 @@
change_p = true;
lra_update_dup (curr_id, i);
}
-
+
if (change_p)
/* If we've changed the instruction then any alternative that
we chose previously may no longer be valid. */
Index: testsuite/gcc.target/aarch64/pr61325.c
===================================================================
--- testsuite/gcc.target/aarch64/pr61325.c (revision 0)
+++ testsuite/gcc.target/aarch64/pr61325.c (working copy)
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+typedef unsigned int wchar_t;
+typedef long unsigned int size_t;
+
+size_t
+wcstombs(char *s , const wchar_t *pwcs , size_t n)
+{
+ int count = 0;
+
+ if (n != 0) {
+ do {
+ if ((*s++ = (char) *pwcs++) == 0)
+ break;
+ count++;
+ } while (--n != 0);
+ }
+ return count;
+}
