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re PR target/79430 (action of statement incorrectly optimised away) 

PR target/79430
	* reg-stack.c (emit_swap_insn): If i1src mentions the stack pointer,
	punt if tmp contains autoinc of stack pointer.

From-SVN: r247308
This commit is contained in:
Jakub Jelinek 2017-04-27 11:58:43 +02:00 committed by Jakub Jelinek
parent a22d92795b
commit e469603e97
2 changed files with 30 additions and 0 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
2017-04-27 Jakub Jelinek <jakub@redhat.com>
PR target/79430
* reg-stack.c (emit_swap_insn): If i1src mentions the stack pointer,
punt if tmp contains autoinc of stack pointer.
PR target/77728
* config/aarch64/aarch64.c (struct aarch64_fn_arg_alignment): Remove.
(aarch64_function_arg_alignment): Return unsigned int again, but still

26
gcc/reg-stack.c
View File

@ -915,6 +915,7 @@ emit_swap_insn (rtx_insn *insn, stack_ptr regstack, rtx reg)
rtx i2set;
rtx_insn *tmp = PREV_INSN (i1);
rtx_insn *limit = PREV_INSN (BB_HEAD (current_block));
bool sp_used = reg_overlap_mentioned_p (stack_pointer_rtx, i1src);
/* Find the previous insn involving stack regs, but don't pass a
block boundary. */
while (tmp != limit)
@ -928,6 +929,31 @@ emit_swap_insn (rtx_insn *insn, stack_ptr regstack, rtx reg)
i2 = tmp;
break;
}
/* FIXME: modified_between_p does not consider autoinc
modifications of stack pointer if i1src refers to
stack pointer, check it here manually. */
if (sp_used && NONDEBUG_INSN_P (tmp))
{
subrtx_var_iterator::array_type array;
FOR_EACH_SUBRTX_VAR (iter, array, PATTERN (tmp), NONCONST)
{
rtx mem = *iter;
if (mem
&& MEM_P (mem)
&& (GET_RTX_CLASS (GET_CODE (XEXP (mem, 0)))
== RTX_AUTOINC))
{
if (XEXP (XEXP (mem, 0), 0) == stack_pointer_rtx)
{
i2 = tmp;
break;
}
iter.skip_subrtxes ();
}
}
if (i2)
break;
}
tmp = PREV_INSN (tmp);
}
if (i2 != NULL_RTX