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[i386] Fold __builtin_ia32_shufpd to VEC_PERM_EXPR

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2019-05-20  Marc Glisse  <marc.glisse@inria.fr>

	PR rtl-optimization/43147
	* config/i386/i386.c (ix86_gimple_fold_builtin): Handle
	IX86_BUILTIN_SHUFPD.

From-SVN: r271422
This commit is contained in:
Marc Glisse 2019-05-20 16:53:29 +02:00 • committed by Marc Glisse
parent 7f67becc98
commit 4d508751f4
2 changed files with 33 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2019-05-20 Marc Glisse <marc.glisse@inria.fr>
PR rtl-optimization/43147
* config/i386/i386.c (ix86_gimple_fold_builtin): Handle
IX86_BUILTIN_SHUFPD.
2019-05-20 Jan Hubicka <hubicka@ucw.cz>
* tree-ssa-alias.c (refs_may_alias_p_2): Break out from ...

28
gcc/config/i386/i386.c
View file

@ -17297,7 +17297,7 @@ ix86_gimple_fold_builtin (gimple_stmt_iterator *gsi)
int n_args = gimple_call_num_args (stmt);
enum ix86_builtins fn_code = (enum ix86_builtins) DECL_FUNCTION_CODE (fndecl);
tree decl = NULL_TREE;
tree arg0, arg1;
tree arg0, arg1, arg2;
enum rtx_code rcode;
unsigned HOST_WIDE_INT count;
bool is_vshift;
@ -17601,6 +17601,32 @@ ix86_gimple_fold_builtin (gimple_stmt_iterator *gsi)
}
break;
case IX86_BUILTIN_SHUFPD:
arg2 = gimple_call_arg (stmt, 2);
if (TREE_CODE (arg2) == INTEGER_CST)
{
location_t loc = gimple_location (stmt);
unsigned HOST_WIDE_INT imask = TREE_INT_CST_LOW (arg2);
arg0 = gimple_call_arg (stmt, 0);
arg1 = gimple_call_arg (stmt, 1);
tree itype = long_long_integer_type_node;
tree vtype = build_vector_type (itype, 2); /* V2DI */
tree_vector_builder elts (vtype, 2, 1);
/* Ignore bits other than the lowest 2. */
elts.quick_push (build_int_cst (itype, imask & 1));
imask >>= 1;
elts.quick_push (build_int_cst (itype, 2 + (imask & 1)));
tree omask = elts.build ();
gimple *g = gimple_build_assign (gimple_call_lhs (stmt),
VEC_PERM_EXPR,
arg0, arg1, omask);
gimple_set_location (g, loc);
gsi_replace (gsi, g, false);
return true;
}
// Do not error yet, the constant could be propagated later?
break;
default:
break;
}