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alpha.c (alpha_pad_noreturn): New static function. 

* config/alpha/alpha.c (alpha_pad_noreturn): New static function.
	(alpha_reorg): Call alpha_pad_noreturn.

From-SVN: r142858
This commit is contained in:
Uros Bizjak 2008-12-21 12:50:59 +01:00
parent 10bcc2b8a1
commit 76a4a1bd8d
2 changed files with 64 additions and 5 deletions
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15
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2008-12-21 Uros Bizjak <ubizjak@gmail.com>
* config/alpha/alpha.c (alpha_pad_noreturn): New static function.
(alpha_reorg): Call alpha_pad_noreturn.
2008-12-21 Denis Chertykov <denisc@overta.ru>
* config/avr/avr.md ("andsi3"): Fix wrong cc attribute.
@ -152,10 +157,10 @@
2008-12-17 Sebastian Pop <sebastian.pop@amd.com>
* doc/install.texi (Prerequisites): Document PPL and CLooG-PPL
dependences and the configure options.
(Configuration): Document --with-cloog, --with-ppl, --with-cloog-lib,
--with-ppl-lib, --with-cloog-incude, --with-ppl-include.
* doc/install.texi (Prerequisites): Document PPL and CLooG-PPL
dependences and the configure options.
(Configuration): Document --with-cloog, --with-ppl, --with-cloog-lib,
--with-ppl-lib, --with-cloog-incude, --with-ppl-include.
2008-12-17 H.J. Lu <hongjiu.lu@intel.com>
@ -243,7 +248,7 @@
for the milli.a library.
2008-12-12 Andrew Pinski <andrew_pinskia@playstation.sony.com>
Peter Bergner <bergner@vnet.ibm.com>
Peter Bergner <bergner@vnet.ibm.com>
PR target/24779
* config/rs6000/rs6000.md (call_indirect_aix32): Move the load of the

54
gcc/config/alpha/alpha.c
View File

@ -9299,12 +9299,66 @@ alpha_align_insns (unsigned int max_align,
i = next;
}
}
/* Insert an unop between a noreturn function call and GP load. */
static void
alpha_pad_noreturn (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))
continue;
next = next_active_insn (insn);
if (next)
{
rtx pat = PATTERN (next);
if (GET_CODE (pat) == SET
&& GET_CODE (SET_SRC (pat)) == UNSPEC_VOLATILE
&& XINT (SET_SRC (pat), 1) == UNSPECV_LDGP1)
emit_insn_after (gen_unop (), insn);
}
}
}
/* Machine dependent reorg pass. */
static void
alpha_reorg (void)
{
/* Workaround for a linker error that triggers when an
exception handler immediatelly follows a noreturn function.
The instruction stream from an object file:
54: 00 40 5b 6b jsr ra,(t12),58 <__func+0x58>
58: 00 00 ba 27 ldah gp,0(ra)
5c: 00 00 bd 23 lda gp,0(gp)
60: 00 00 7d a7 ldq t12,0(gp)
64: 00 40 5b 6b jsr ra,(t12),68 <__func+0x68>
was converted in the final link pass to:
fdb24: a0 03 40 d3 bsr ra,fe9a8 <_called_func+0x8>
fdb28: 00 00 fe 2f unop
fdb2c: 00 00 fe 2f unop
fdb30: 30 82 7d a7 ldq t12,-32208(gp)
fdb34: 00 40 5b 6b jsr ra,(t12),fdb38 <__func+0x68>
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
exception handler prologue. */
if (current_function_has_exception_handlers ())
alpha_pad_noreturn ();
if (alpha_tp != ALPHA_TP_PROG || flag_exceptions)
alpha_handle_trap_shadows ();