re PR middle-end/47968 (ICE: in gen_lowpart_general, at rtlhooks.c:51 when converting...

2011-03-04  Richard Guenther  <rguenther@suse.de>

	PR middle-end/47968
	* expmed.c (extract_bit_field_1): Prefer vector modes that
	vec_extract patterns can handle.

	* gcc.dg/torture/pr47968.c: New testcase.

From-SVN: r170673

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a968fe7449e1d7b71f742021578f5be070357c77..9c4631aa50caee44a6deeca321a3a0d85840f10f 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2011-03-04  Richard Guenther  <rguenther@suse.de>
+
+       PR middle-end/47968
+       * expmed.c (extract_bit_field_1): Prefer vector modes that
+       vec_extract patterns can handle.
+
 2011-03-04  Richard Guenther  <rguenther@suse.de>
 
        PR middle-end/47975

diff --git a/gcc/expmed.c b/gcc/expmed.c
index f17abb53568657eb89d66f8e830737e0b89686ce..b0c1e235dd7e80391bcfe27a0be6a176fc50f4fe 100644 (file)
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -1205,7 +1205,6 @@ extract_bit_field_1 (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
       && GET_MODE_INNER (GET_MODE (op0)) != tmode)
     {
       enum machine_mode new_mode;
-      int nunits = GET_MODE_NUNITS (GET_MODE (op0));
 
       if (GET_MODE_CLASS (tmode) == MODE_FLOAT)
        new_mode = MIN_MODE_VECTOR_FLOAT;
@@ -1221,8 +1220,7 @@ extract_bit_field_1 (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
        new_mode = MIN_MODE_VECTOR_INT;
 
       for (; new_mode != VOIDmode ; new_mode = GET_MODE_WIDER_MODE (new_mode))
-       if (GET_MODE_NUNITS (new_mode) == nunits
-           && GET_MODE_SIZE (new_mode) == GET_MODE_SIZE (GET_MODE (op0))
+       if (GET_MODE_SIZE (new_mode) == GET_MODE_SIZE (GET_MODE (op0))
            && targetm.vector_mode_supported_p (new_mode))
          break;
       if (new_mode != VOIDmode)

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index c10542285755267b5deacc475aa35ac319e1cb71..e49bd7953deaf6b7c5ce7e7223f075d6c5af782e 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2011-03-04  Richard Guenther  <rguenther@suse.de>
+
+       PR middle-end/47968
+       * gcc.dg/torture/pr47968.c: New testcase.
+
 2011-03-04  Richard Guenther  <rguenther@suse.de>
 
        PR middle-end/47975

diff --git a/gcc/testsuite/gcc.dg/torture/pr47968.c b/gcc/testsuite/gcc.dg/torture/pr47968.c
new file mode 100644 (file)
index 0000000..5d60a0f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr47968.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+
+typedef __attribute__ ((vector_size (16))) float float4;
+typedef __attribute__ ((vector_size (16))) double double2;
+
+float foo (double2 d2)
+{
+  float4 f4 = (float4) d2;
+  return *(float *) &f4;
+}
+