===================================================================
@@ -3975,18 +3975,6 @@ lra_constraints (bool first_p)
dest_reg = SUBREG_REG (dest_reg);
if ((REG_P (dest_reg)
&& (x = get_equiv_substitution (dest_reg)) != dest_reg
- /* Check that this is actually an insn setting up
- the equivalence. */
- && (in_list_p (curr_insn,
- ira_reg_equiv
- [REGNO (dest_reg)].init_insns)
- /* Init insns may contain not all insns setting
- up equivalence as we have live range
- splitting. So here we use another condition
- to check insn setting up the equivalence
- which should be removed, e.g. in case when
- the equivalence is a constant. */
- || ! MEM_P (x))
/* Remove insns which set up a pseudo whose value
can not be changed. Such insns might be not in
init_insns because we don't update equiv data
@@ -3999,8 +3987,10 @@ lra_constraints (bool first_p)
secondary memory movement. Then the pseudo is
spilled and we use the equiv constant. In this
case we should remove the additional insn and
- this insn is not init_insns list. */
+ this insn is not init_insns list. */
&& (! MEM_P (x) || MEM_READONLY_P (x)
+ /* Check that this is actually an insn setting
+ up the equivalence. */
|| in_list_p (curr_insn,
ira_reg_equiv
[REGNO (dest_reg)].init_insns)))
===================================================================
@@ -0,0 +1,38 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+
+int a, b, c, d, e, f, h, l, m, n, k, o;
+long long g;
+
+struct S
+{
+ int f1;
+ int f2;
+ int f3;
+ int f4;
+};
+
+static struct S i = {0,0,0,0}, j;
+
+void
+foo ()
+{
+ m = 1 & d;
+ n = b + c;
+ o = k >> 1;
+ f = 0 == e;
+}
+
+int
+main ()
+{
+ for (; h < 1; h++)
+ {
+ g = 1 | (0 > 1 - a ? 0 : a);
+ foo ();
+ for (l = 0; l < 3; l++)
+ j = i;
+ }
+ return 0;
+}
The following patch fixes http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58759 The patch was successfully bootstrapped and tested on x86/x86-64. Committed as rev. 204080. 2013-10-25 Vladimir Makarov <vmakarov@redhat.com> PR rtl-optimization/58759 * lra-constraints.c (lra_constraints): Remove wrong condition to remove insn setting up an equivalent pseudo. 2013-10-25 Vladimir Makarov <vmakarov@redhat.com> PR rtl-optimization/58759 * gcc.target/i386/pr58759.c: New.