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alpha.c (alpha_pad_noreturn): Rename to ... 

* config/alpha/alpha.c (alpha_pad_noreturn): Rename to ...
	(alpha_pad_function_end): ... this.  Also insert NOP between
	sibling call and GP load.
	(alpha_reorg): Update call to alpha_pad_function_end.  Expand comment.

From-SVN: r190262
This commit is contained in:
Uros Bizjak 2012-08-09 20:44:40 +02:00 committed by Uros Bizjak
parent 75e5f9516f
commit 7b1b36b373
2 changed files with 38 additions and 7 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,13 @@
2012-08-09 Uros Bizjak <ubizjak@gmail.com>
Backport from mainline
2012-08-09 Uros Bizjak <ubizjak@gmail.com>
* config/alpha/alpha.c (alpha_pad_noreturn): Rename to ...
(alpha_pad_function_end): ... this. Also insert NOP between
sibling call and GP load.
(alpha_reorg): Update call to alpha_pad_function_end. Expand comment.
2012-08-09 H.J. Lu <hongjiu.lu@intel.com>
Backport from mainline

35
gcc/config/alpha/alpha.c
View File

@ -9310,17 +9310,18 @@ alpha_align_insns (unsigned int max_align,
}
}
/* Insert an unop between a noreturn function call and GP load. */
/* Insert an unop between sibcall or noreturn function call and GP load. */
static void
alpha_pad_noreturn (void)
alpha_pad_function_end (void)
{
rtx insn, next;
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
{
if (! (CALL_P (insn)
&& find_reg_note (insn, REG_NORETURN, NULL_RTX)))
&& (SIBLING_CALL_P (insn)
|| find_reg_note (insn, REG_NORETURN, NULL_RTX))))
continue;
/* Make sure we do not split a call and its corresponding
@ -9352,8 +9353,28 @@ alpha_pad_noreturn (void)
static void
alpha_reorg (void)
{
/* Workaround for a linker error that triggers when an
exception handler immediatelly follows a noreturn function.
/* Workaround for a linker error that triggers when an exception
handler immediatelly follows a sibcall or a noreturn function.
In the sibcall case:
The instruction stream from an object file:
1d8: 00 00 fb 6b jmp (t12)
1dc: 00 00 ba 27 ldah gp,0(ra)
1e0: 00 00 bd 23 lda gp,0(gp)
1e4: 00 00 7d a7 ldq t12,0(gp)
1e8: 00 40 5b 6b jsr ra,(t12),1ec <__funcZ+0x1ec>
was converted in the final link pass to:
12003aa88: 67 fa ff c3 br 120039428 <...>
12003aa8c: 00 00 fe 2f unop
12003aa90: 00 00 fe 2f unop
12003aa94: 48 83 7d a7 ldq t12,-31928(gp)
12003aa98: 00 40 5b 6b jsr ra,(t12),12003aa9c <__func+0x1ec>
And in the noreturn case:
The instruction stream from an object file:
@ -9373,11 +9394,11 @@ alpha_reorg (void)
GP load instructions were wrongly cleared by the linker relaxation
pass. This workaround prevents removal of GP loads by inserting
an unop instruction between a noreturn function call and
an unop instruction between a sibcall or noreturn function call and
exception handler prologue. */
if (current_function_has_exception_handlers ())
alpha_pad_noreturn ();
alpha_pad_function_end ();
if (alpha_tp != ALPHA_TP_PROG || flag_exceptions)
alpha_handle_trap_shadows ();