The following patch fixes
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57960
The patch was successfully bootstrapped and tested on s390 and x86/x86-64.
Committed as rev. 201243.
2013-07-25 Vladimir Makarov <vmaka...@redhat.com>
PR rtl-optimization/57960
* lra-constraints.c (process_alt_operands): Use the right mode
when checking strict_low.
2013-07-25 Vladimir Makarov <vmaka...@redhat.com>
PR rtl-optimization/57960
* gcc.target/s390/pr57960.c: New.
Index: lra-constraints.c
===================================================================
--- lra-constraints.c (revision 201215)
+++ lra-constraints.c (working copy)
@@ -1940,7 +1940,8 @@ process_alt_operands (int only_alternati
&& ira_class_hard_regs_num[this_alternative] > 0
&& ! HARD_REGNO_MODE_OK (ira_class_hard_regs
[this_alternative][0],
- GET_MODE (op)))
+ GET_MODE
+ (*curr_id->operand_loc[nop])))
goto fail;
losers++;
}
Index: testsuite/gcc.target/s390/pr57960.c
===================================================================
--- testsuite/gcc.target/s390/pr57960.c (revision 0)
+++ testsuite/gcc.target/s390/pr57960.c (working copy)
@@ -0,0 +1,30 @@
+/* PR rtl-optimization/57960 */
+
+/* { dg-do compile } */
+/* { dg-options "-march=z10 -m64 -mzarch -O1" } */
+
+typedef union
+{
+ long double value;
+ struct
+ {
+ unsigned int w0, w1, w2, w3;
+ }
+ parts32;
+}
+ ieee854_long_double_shape_type;
+static const long double one = 1.0L;
+long double
+__ieee754_acosl (long double x)
+{
+ long double z, w;
+ int ix;
+ ieee854_long_double_shape_type u;
+
+ z = (one - u.value) * 0.5;
+ u.parts32.w2 = 0;
+ u.parts32.w3 = 0;
+ w = z - u.value * u.value;
+ return 2.0 * w;
+
+}
