This avoids ICEing when there is no LHS on the call by following
what foldings of other builtins do in , namely not folding.
Bootstrapped on x86_64-unknown-linux-gnu, testing in progress.
Will push as obvious.
Richard.
2022-01-20 Richard Biener <rguent...@suse.de>
PR target/100784
* config/i386/i386.cc (ix86_gimple_fold_builtin): Check for
LHS before folding __builtin_ia32_shufpd and friends.
---
gcc/config/i386/i386.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index af828868205..ad5a5caa413 100644
--- 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. */
--
2.31.1
