target/100784 - avoid ICE with folding __builtin_ia32_shufpd

This avoids ICEing when there is no LHS on the call by following
what foldings of other builtins do in , namely not folding.

2022-01-20  Richard Biener  <rguenther@suse.de>

	PR target/100784
	* config/i386/i386.cc (ix86_gimple_fold_builtin): Check for
	LHS before folding __builtin_ia32_shufpd and friends.

diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index af82886..ad5a5ca 100644 (file)
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -18710,7 +18710,7 @@ ix86_gimple_fold_builtin (gimple_stmt_iterator *gsi)
                                    gimple_call_arg (stmt, n_args - 1)))
        break;
       arg2 = gimple_call_arg (stmt, 2);
-      if (TREE_CODE (arg2) == INTEGER_CST)
+      if (TREE_CODE (arg2) == INTEGER_CST && gimple_call_lhs (stmt))
        {
          unsigned HOST_WIDE_INT shuffle_mask = TREE_INT_CST_LOW (arg2);
          /* Check valid imm, refer to gcc.target/i386/testimm-10.c.  */