re PR middle-end/49029 (ICE in simplify_subreg, at simplify-rtx.c:5266)

	PR middle-end/49029
	* expmed.c (extract_fixed_bit_field): Test whether target can be used
	only after deciding which mode to use.

	* gcc.c-torture/compile/pr49029.c: New test.

From-SVN: r174034

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a022b62d23e7e78e40bd245f140b73818997406d..122e4dff57e045011b99942111faba384a64e043 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2011-05-22  Jakub Jelinek  <jakub@redhat.com>
+
+       PR middle-end/49029
+       * expmed.c (extract_fixed_bit_field): Test whether target can be used
+       only after deciding which mode to use.
+
 2011-05-22  Tom de Vries  <tom@codesourcery.com>
 
        PR target/45098

diff --git a/gcc/expmed.c b/gcc/expmed.c
index 18a65929f78c17e337b82f80b700dc2cd4499104..5527c1e711282fb0aef5c92e8bc8d63311eeae40 100644 (file)
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -1769,8 +1769,6 @@ extract_fixed_bit_field (enum machine_mode tmode, rtx op0,
   /* To extract a signed bit-field, first shift its msb to the msb of the word,
      then arithmetic-shift its lsb to the lsb of the word.  */
   op0 = force_reg (mode, op0);
-  if (mode != tmode)
-    target = 0;
 
   /* Find the narrowest integer mode that contains the field.  */
 
@@ -1782,6 +1780,9 @@ extract_fixed_bit_field (enum machine_mode tmode, rtx op0,
        break;
       }
 
+  if (mode != tmode)
+    target = 0;
+
   if (GET_MODE_BITSIZE (mode) != (bitsize + bitpos))
     {
       int amount = GET_MODE_BITSIZE (mode) - (bitsize + bitpos);

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f083968b1c6baa1cea405e11634df1002cfdc8a5..015b4fae01eff50276384e4469c0721e179e1421 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2011-05-22  Jakub Jelinek  <jakub@redhat.com>
+
+       PR middle-end/49029
+       * gcc.c-torture/compile/pr49029.c: New test.
+
 2011-05-22  Jason Merrill  <jason@redhat.com>
 
        * g++.dg/cpp0x/sfinae23.C: New.

diff --git a/gcc/testsuite/gcc.c-torture/compile/pr49029.c b/gcc/testsuite/gcc.c-torture/compile/pr49029.c
new file mode 100644 (file)
index 0000000..ebe81b3
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr49029.c
@@ -0,0 +1,10 @@
+/* PR middle-end/49029 */
+struct S { volatile unsigned f : 11; signed g : 30; } __attribute__((packed));
+struct T { volatile struct S h; } __attribute__((packed)) a;
+void foo (int);
+
+void
+bar ()
+{
+  foo (a.h.g);
+}