i386: Fix assert in ix86_function_arg [PR105970]

The mode of pointer argument should equal ptr_mode, not Pmode.

2022-06-17  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

	PR target/105970
	* config/i386/i386.cc (ix86_function_arg): Assert that
	the mode of pointer argumet is equal to ptr_mode, not Pmode.

gcc/testsuite/ChangeLog:

	PR target/105970
	* gcc.target/i386/pr105970.c: New test.

(cherry picked from commit 1f8278bfcfc7f7157bf2b405471e67dd5097636b)

2 files changed, 7 insertions, 1 deletions

diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index 86752a6516a..83995a8cc6b 100644
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -3348,7 +3348,7 @@ ix86_function_arg (cumulative_args_t cum_v, const function_arg_info &arg)
       if (POINTER_TYPE_P (arg.type))
         {
           /* This is the pointer argument.  */
-          gcc_assert (TYPE_MODE (arg.type) == Pmode);
+          gcc_assert (TYPE_MODE (arg.type) == ptr_mode);
           /* It is at -WORD(AP) in the current frame in interrupt and
              exception handlers.  */
           reg = plus_constant (Pmode, arg_pointer_rtx, -UNITS_PER_WORD);
diff --git a/gcc/testsuite/gcc.target/i386/pr105970.c b/gcc/testsuite/gcc.target/i386/pr105970.c
new file mode 100644
index 00000000000..326486faebf
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr105970.c
@@ -0,0 +1,6 @@
+/* PR target/105970 */
+/* { dg-do compile { target { ! ia32 } } } */
+/* { dg-require-effective-target maybe_x32 } */
+/* { dg-options "-mx32 -mgeneral-regs-only -maddress-mode=long" } */
+
+#include "../../gcc.dg/torture/pr68037-1.c"