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rs6000: Small varargs for BE SVR4 (PR61729, PR77850)

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The varargs code for SVR4 puts all (integer) arguments in 4-byte slots.
When it then reads an item from there as something not a multiple of 4
bytes, it needs to adjust the address if big endian.  We didn't yet do
that.

This fixes the g++.dg/abi/scoped1.C, gcc.dg/compat/scalar-by-value-4,
and gcc.dg/compat/scalar-return-4 testcases.


	PR target/61729
	PR target/77850
	* config/rs6000/rs6000.c (rs6000_gimplify_va_arg): Adjust address to
	read from, for big endian.

From-SVN: r244740
This commit is contained in:
Segher Boessenkool 2017-01-21 04:11:49 +01:00 committed by Segher Boessenkool
parent 5e00757022
commit 80b40b8784
2 changed files with 17 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2017-01-20 Segher Boessenkool <segher@kernel.crashing.org>
PR target/61729
PR target/77850
* config/rs6000/rs6000.c (rs6000_gimplify_va_arg): Adjust address to
read from, for big endian.
2017-01-20 Jiong Wang <jiong.wang@arm.com>
* config/aarch64/aarch64-builtins.c (aarch64_init_builtins): Register

10
gcc/config/rs6000/rs6000.c
View File

@ -13684,6 +13684,7 @@ rs6000_gimplify_va_arg (tree valist, tree type, gimple_seq *pre_p,
size = int_size_in_bytes (type);
rsize = (size + 3) / 4;
int pad = 4 * rsize - size;
align = 1;
machine_mode mode = TYPE_MODE (type);
@ -13765,6 +13766,10 @@ rs6000_gimplify_va_arg (tree valist, tree type, gimple_seq *pre_p,
&& mode == SDmode)
t = fold_build_pointer_plus_hwi (t, size);
/* Args are passed right-aligned. */
if (BYTES_BIG_ENDIAN)
t = fold_build_pointer_plus_hwi (t, pad);
gimplify_assign (addr, t, pre_p);
gimple_seq_add_stmt (pre_p, gimple_build_goto (lab_over));
@ -13790,6 +13795,11 @@ rs6000_gimplify_va_arg (tree valist, tree type, gimple_seq *pre_p,
t = build2 (BIT_AND_EXPR, TREE_TYPE (t), t,
build_int_cst (TREE_TYPE (t), -align));
}
/* Args are passed right-aligned. */
if (BYTES_BIG_ENDIAN)
t = fold_build_pointer_plus_hwi (t, pad);
gimplify_expr (&t, pre_p, NULL, is_gimple_val, fb_rvalue);
gimplify_assign (unshare_expr (addr), t, pre_p);