[PATCH] rs6000: Fix ICE of vect cost related to V1TI [PR102767]

["Kewen.Lin" <linkw@linux.ibm.com>]

Hi,

As PR102767 shows, the commit r12-3482 exposed one ICE in function
rs6000_builtin_vectorization_cost.  We claims V1TI supports movmisalign
on rs6000 (See define_expand "movmisalign<mode>"), so it return true in
rs6000_builtin_support_vector_misalignment for misalign 8.  Later in
the cost querying rs6000_builtin_vectorization_cost, we don't have
the arms to handle the V1TI input under (TARGET_VSX &&
TARGET_ALLOW_MOVMISALIGN).

The proposed fix is to add the consideration for V1TI, simply make it
as the cost for doubleword which is apparently bigger than the cost of
scalar, won't have the vectorization to happen, just to keep consistency
and avoid ICE.  Another thought is to not support movmisalign for V1TI,
but it sounds like a bad idea since it doesn't match the reality.

Bootstrapped and regtested on powerpc64le-linux-gnu P9 and
powerpc64-linux-gnu P8.

Is it ok for trunk?

BR,
Kewen
-----
gcc/ChangeLog:

	PR target/102767
	* config/rs6000/rs6000.c (rs6000_builtin_vectorization_cost): Consider
	V1T1 mode for unaligned load and store.

gcc/testsuite/ChangeLog:

	PR target/102767
	* gcc.target/powerpc/ppc-fortran/pr102767.f90: New file.

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index b7ea1483da5..73d3e06c3fc 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -5145,7 +5145,8 @@ rs6000_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
 	if (TARGET_VSX && TARGET_ALLOW_MOVMISALIGN)
 	  {
 	    elements = TYPE_VECTOR_SUBPARTS (vectype);
-	    if (elements == 2)
+	    /* See PR102767, consider V1TI to keep consistency.  */
+	    if (elements == 2 || elements == 1)
 	      /* Double word aligned.  */
 	      return 4;

@@ -5184,10 +5185,11 @@ rs6000_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,

         if (TARGET_VSX && TARGET_ALLOW_MOVMISALIGN)
           {
-            elements = TYPE_VECTOR_SUBPARTS (vectype);
-            if (elements == 2)
-              /* Double word aligned.  */
-              return 2;
+	    elements = TYPE_VECTOR_SUBPARTS (vectype);
+	    /* See PR102767, consider V1TI to keep consistency.  */
+	    if (elements == 2 || elements == 1)
+	      /* Double word aligned.  */
+	      return 2;

             if (elements == 4)
               {
diff --git a/gcc/testsuite/gcc.target/powerpc/ppc-fortran/pr102767.f90 b/gcc/testsuite/gcc.target/powerpc/ppc-fortran/pr102767.f90
new file mode 100644
index 00000000000..a4122482989
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/ppc-fortran/pr102767.f90
@@ -0,0 +1,21 @@
+! { dg-require-effective-target powerpc_vsx_ok }
+! { dg-options "-mvsx -O2 -ftree-vectorize -mno-efficient-unaligned-vsx" }
+
+INTERFACE
+  FUNCTION elemental_mult (a, b, c)
+    type(*), DIMENSION(..) :: a, b, c
+  END
+END INTERFACE
+
+allocatable  z
+integer, dimension(2,2) :: a, b
+call test_CFI_address
+contains
+  subroutine test_CFI_address
+    if (elemental_mult (z, x, y) .ne. 0) stop
+    a = reshape ([4,3,2,1], [2,2])
+    b = reshape ([2,3,4,5], [2,2])
+    if (elemental_mult (i, a, b) .ne. 0) stop
+  end
+end
+