===================================================================
@@ -5576,6 +5576,95 @@ mips_va_start (tree valist, rtx nextarg)
}
}
+/* Like std_gimplify_va_arg_expr, but apply alignment to zero-sized
+ types as well. */
+
+static tree
+mips_std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
+ gimple_seq *post_p)
+{
+ tree addr, t, type_size, rounded_size, valist_tmp;
+ unsigned HOST_WIDE_INT align, boundary;
+ bool indirect;
+
+ indirect = pass_by_reference (NULL, TYPE_MODE (type), type, false);
+ if (indirect)
+ type = build_pointer_type (type);
+
+ align = PARM_BOUNDARY / BITS_PER_UNIT;
+ boundary = targetm.calls.function_arg_boundary (TYPE_MODE (type), type);
+
+ /* When we align parameter on stack for caller, if the parameter
+ alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
+ aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
+ here with caller. */
+ if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT)
+ boundary = MAX_SUPPORTED_STACK_ALIGNMENT;
+
+ boundary /= BITS_PER_UNIT;
+
+ /* Hoist the valist value into a temporary for the moment. */
+ valist_tmp = get_initialized_tmp_var (valist, pre_p, NULL);
+
+ /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
+ requires greater alignment, we must perform dynamic alignment. */
+ if (boundary > align)
+ {
+ t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
+ fold_build_pointer_plus_hwi (valist_tmp, boundary - 1));
+ gimplify_and_add (t, pre_p);
+
+ t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
+ fold_build2 (BIT_AND_EXPR, TREE_TYPE (valist),
+ valist_tmp,
+ build_int_cst (TREE_TYPE (valist), -boundary)));
+ gimplify_and_add (t, pre_p);
+ }
+ else
+ boundary = align;
+
+ /* If the actual alignment is less than the alignment of the type,
+ adjust the type accordingly so that we don't assume strict alignment
+ when dereferencing the pointer. */
+ boundary *= BITS_PER_UNIT;
+ if (boundary < TYPE_ALIGN (type))
+ {
+ type = build_variant_type_copy (type);
+ TYPE_ALIGN (type) = boundary;
+ }
+
+ /* Compute the rounded size of the type. */
+ type_size = size_in_bytes (type);
+ rounded_size = round_up (type_size, align);
+
+ /* Reduce rounded_size so it's sharable with the postqueue. */
+ gimplify_expr (&rounded_size, pre_p, post_p, is_gimple_val, fb_rvalue);
+
+ /* Get AP. */
+ addr = valist_tmp;
+ if (PAD_VARARGS_DOWN && !integer_zerop (rounded_size))
+ {
+ /* Small args are padded downward. */
+ t = fold_build2_loc (input_location, GT_EXPR, sizetype,
+ rounded_size, size_int (align));
+ t = fold_build3 (COND_EXPR, sizetype, t, size_zero_node,
+ size_binop (MINUS_EXPR, rounded_size, type_size));
+ addr = fold_build_pointer_plus (addr, t);
+ }
+
+ /* Compute new value for AP. */
+ t = fold_build_pointer_plus (valist_tmp, rounded_size);
+ t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist, t);
+ gimplify_and_add (t, pre_p);
+
+ addr = fold_convert (build_pointer_type (type), addr);
+
+ if (indirect)
+ addr = build_va_arg_indirect_ref (addr);
+
+ return build_va_arg_indirect_ref (addr);
+}
+
/* Implement TARGET_GIMPLIFY_VA_ARG_EXPR. */
static tree
@@ -5590,7 +5679,7 @@ mips_gimplify_va_arg_expr (tree valist,
type = build_pointer_type (type);
if (!EABI_FLOAT_VARARGS_P)
- addr = std_gimplify_va_arg_expr (valist, type, pre_p, post_p);
+ addr = mips_std_gimplify_va_arg_expr (valist, type, pre_p, post_p);
else
{
tree f_ovfl, f_gtop, f_ftop, f_goff, f_foff;
===================================================================
@@ -924,6 +924,19 @@ proc check_effective_target_mips_rel { }
}]
}
+# Return true if the target is a MIPS target that uses the EABI.
+
+proc check_effective_target_mips_eabi { } {
+ if { ![istarget mips*-*-*] } {
+ return 0
+ }
+ return [check_no_compiler_messages mips_eabi object {
+ #ifndef __mips_eabi
+ #error FOO
+ #endif
+ }]
+}
+
# Return 1 if the current multilib does not generate PIC by default.
proc check_effective_target_nonpic { } {
===================================================================
@@ -0,0 +1,48 @@
+/* See PR 52154 for the xfail. */
+/* { dg-do run { xfail { mips_eabi && { hard_float && ilp32 } } } } */
+
+#include <stdarg.h>
+
+extern void abort (void);
+
+struct __attribute__((aligned(16))) empty {};
+
+static void __attribute__((noinline))
+check_args (int count, ...)
+{
+ va_list va;
+ int i;
+
+ va_start (va, count);
+ for (i = 0; i < count; i++)
+ if (va_arg (va, int) != 1000 + i)
+ abort ();
+
+ va_arg (va, struct empty);
+ if (va_arg (va, int) != 2000 + count)
+ abort ();
+
+ va_end (va);
+}
+
+int
+main (void)
+{
+ struct empty e;
+
+ check_args (1, 1000, e, 2001);
+ check_args (2, 1000, 1001, e, 2002);
+ check_args (3, 1000, 1001, 1002, e, 2003);
+ check_args (4, 1000, 1001, 1002, 1003, e, 2004);
+ check_args (5, 1000, 1001, 1002, 1003, 1004, e, 2005);
+ check_args (6, 1000, 1001, 1002, 1003, 1004, 1005, e, 2006);
+ check_args (7, 1000, 1001, 1002, 1003, 1004, 1005, 1006, e, 2007);
+ check_args (8, 1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, e, 2008);
+ check_args (9, 1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007,
+ 1008, e, 2009);
+ check_args (10, 1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007,
+ 1008, 1009, e, 2010);
+ check_args (11, 1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007,
+ 1008, 1009, 1010, e, 2011);
+ return 0;
+}
Given the unacceptability of the original builtins patch: http://gcc.gnu.org/ml/gcc-patches/2012-01/msg01564.html I've decided to go for this MIPS-specific version. I've also made the test specific to MIPS and XFAILed it for EABI32 (the failures there don't seem to be a regression). We could potentially make both mips_std_gimplify_va_arg_expr and the testcase available to all targets later. This shows that mips_gimplify_va_arg_expr ought to be testing EABI_FLOAT_VARARGS_P at the very beginning. Stuff like: indirect_p = pass_by_reference (NULL, TYPE_MODE (type), type, 0); if (indirect_p) type = build_pointer_type (type); is at best redundant for !EABI_FLOAT_VARARGS_P, since the generic functions do the same thing. That's 4.8 material though. Tested on mips64-linux-gnu and various ELF targets. Applied. Richard gcc/ PR middle-end/24306 * config/mips/mips.c (mips_std_gimplify_va_arg_expr): New function. (mips_gimplify_va_arg_expr): Call it instead of std_gimplify_va_arg_expr. gcc/testsuite/ PR middle-end/24306 PR target/52154 * lib/target-supports.exp (check_effective_target_mips_eabi): New. * gcc.target/mips/va-arg-1.c: New test.