[PATCH, AArch64] Fix the pointer-typed function argument expansion in aarch64_simd_expand_args

[Yufeng Zhang]

This patch fixes a number of test failures in gcc.target/aarch64/v*.c in 
ILP32.

The corresponding RTL patterns for some load/store builtins have Pmode 
(i.e. DImode) specified for their address operands.  However, coming 
from a pointer-typed function argument, op[argc] will have SImode in 
ILP32.  Instead of duplicating these RTL patterns to cope with SImode 
operand (which e.g. would complicate arm_neon.h), we explicitly convert 
the operand to Pmode here; an address operand in a RTL shall have Pmode 
anyway.  Note that if op[argc] already has DImode, 
convert_memory_address will simply return it.

OK for the trunk?

Thanks,
Yufeng

gcc/

        * gimple-ssa-strength-reduction.c (backtrace_base_for_ref): Call
        get_unwidened and check 'base_in' again.diff --git a/gcc/gimple-ssa-strength-reduction.c 
b/gcc/gimple-ssa-strength-reduction.c
index fea5741..7585164 100644
--- a/gcc/gimple-ssa-strength-reduction.c
+++ b/gcc/gimple-ssa-strength-reduction.c
@@ -769,7 +769,14 @@ backtrace_base_for_ref (tree *pbase)
 
   STRIP_NOPS (base_in);
   if (TREE_CODE (base_in) != SSA_NAME)
-    return tree_to_double_int (integer_zero_node);
+    {
+      /* Strip of widening conversion(s) to handle cases where
+        e.g. 'B' is widened from an 'int' in order to calculate
+        a 64-bit address.  */
+      base_in = get_unwidened (base_in, NULL_TREE);
+      if (TREE_CODE (base_in) != SSA_NAME)
+       return tree_to_double_int (integer_zero_node);
+    }
 
   base_cand = base_cand_from_table (base_in);