aarch64: PR target/108140 Handle NULL target in data intrinsic expansion

In this PR we ICE when expanding the __rbit builtin with a NULL target rtx.
I *think* that only happens when the result is unused and hence maybe we shouldn't be expanding
any RTL at all, but the ICE here is easily fixed by deriving the mode from the type of the expression
rather than the target.

This patch does that.
Bootstrapped and tested on aarch64-none-linux-gnu.

gcc/ChangeLog:

	PR target/108140
	* config/aarch64/aarch64-builtins.cc
	(aarch64_expand_builtin_data_intrinsic): Handle NULL target.

gcc/testsuite/ChangeLog:

	PR target/108140
	* gcc.target/aarch64/acle/pr108140.c: New test.

diff --git a/gcc/config/aarch64/aarch64-builtins.cc b/gcc/config/aarch64/aarch64-builtins.cc
index b533082..5c9f727 100644 (file)
--- a/gcc/config/aarch64/aarch64-builtins.cc
+++ b/gcc/config/aarch64/aarch64-builtins.cc
@@ -2648,7 +2648,7 @@ static rtx
 aarch64_expand_builtin_data_intrinsic (unsigned int fcode, tree exp, rtx target)
 {
   expand_operand ops[2];
-  machine_mode mode = GET_MODE (target);
+  machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
   create_output_operand (&ops[0], target, mode);
   create_input_operand (&ops[1], expand_normal (CALL_EXPR_ARG (exp, 0)), mode);
   enum insn_code icode;

diff --git a/gcc/testsuite/gcc.target/aarch64/acle/pr108140.c b/gcc/testsuite/gcc.target/aarch64/acle/pr108140.c
new file mode 100644 (file)
index 0000000..967928a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/acle/pr108140.c
@@ -0,0 +1,15 @@
+/* PR target/108140  */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+#include<arm_acle.h>
+
+int
+main(int argc, char *argv[])
+{
+       unsigned long long input = argc-1;
+       unsigned long long v = __clz(__rbit(input));
+       __builtin_printf("%d %d\n", argc, v >= 64 ? 123 : 456);
+       return 0;
+}
+