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re PR rtl-optimization/38879 (scheduler does not look for conflicting alias sets)

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PR rtl-optimization/38879
	* alias.c (base_alias_check): Unaligned access via AND address can
	alias all surrounding object types except those with sizes equal
	or wider than the size of unaligned access.

From-SVN: r143549
This commit is contained in:
Uros Bizjak 2009-01-21 19:47:19 +01:00
parent d597b3ce68
commit 435da62879
2 changed files with 52 additions and 51 deletions
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64
gcc/ChangeLog
View file

@ -1,9 +1,16 @@
2009-01-21 Uros Bizjak <ubizjak@gmail.com>
PR rtl-optimization/38879
* alias.c (base_alias_check): Unaligned access via AND address can
alias all surrounding object types except those with sizes equal
or wider than the size of unaligned access.
2009-01-21 Dodji Seketeli <dodji@redhat.com>
PR c++/26693
* c-decl.c: (clone_underlying_type): Move this ...
* c-decl.c: (clone_underlying_type): Move this ...
* c-common.c (set_underlying_type): ... here.
Also, make sure the function properly sets TYPE_STUB_DECL() on
Also, make sure the function properly sets TYPE_STUB_DECL() on
the newly created typedef variant type.
(is_typedef_decl ): New entry point.
* tree.h: Added a new member member_types_needing_access_check to
@ -35,7 +42,7 @@
(version_id): Modify.
2009-01-20 Andrew Pinski <andrew_pinski@playstation.sony.com>
Richard Guenther <rguenther@suse.de>
Richard Guenther <rguenther@suse.de>
PR tree-optimization/38747
PR tree-optimization/38748
@ -62,14 +69,13 @@
2009-01-20 Ben Elliston <bje@au.ibm.com>
* libgcov.c (__gcov_execl, __gcov_execlp, __gcov_execle): Remove
const qualifier from arg parameter. Remove unnecessary cast to
char *.
const qualifier from arg parameter. Remove unnecessary cast to char *.
* gcov-io.h (__gcov_execl, __gcov_execlp, __gcov_execle): Remove
const qualifier from arg 2.
2009-01-19 Iain Sandoe <iain.sandoe@sandoe-acoustics.co.uk>
* config/darwin.h: Add static-libgfortran to LINK_SPEC.
* config/darwin.h: Add static-libgfortran to LINK_SPEC.
2009-01-19 Vladimir Makarov <vmakarov@redhat.com>
@ -228,8 +234,7 @@
2009-01-15 Kenneth Zadeck <zadeck@naturalbridge.com>
* dce.c (find_call_stack_args, delete_unmarked_insns): Fixed
comments.
* dce.c (find_call_stack_args, delete_unmarked_insns): Fixed comments.
2009-01-14 Jakub Jelinek <jakub@redhat.com>
@ -255,9 +260,9 @@
2009-01-14 Michael Meissner <gnu@the-meissners.org>
PR target/22599
* i386.c (print_operand): Add tests for 'D', 'C', 'F', 'f' to make
sure the insn is a conditional test (bug 22599). Reformat a few long
lines.
* config/i386/i386.c (print_operand): Add tests for 'D', 'C', 'F', 'f'
to make sure the insn is a conditional test (bug 22599). Reformat a
few long lines.
2009-01-14 Sebastian Pop <sebastian.pop@amd.com>
@ -268,10 +273,6 @@
(graphite_transform_loops): Call cleanup_tree_cfg after all
scops have been code generated.
2009-01-14 Vladimir Makarov <vmakarov@redhat.com>
* testsuite/g++.dg/torture/pr38811.C: New file.
2009-01-14 Basile Starynkevitch <basile@starynkevitch.net>
* doc/gty.texi (Invoking the garbage collector): Added new node
and section documenting ggc_collect.
@ -291,10 +292,8 @@
* ira-conflicts.c: Include addresses.h for the definition of
base_reg_class.
(ira_build_conflicts): Use base_reg_class instead of
BASE_REG_CLASS.
* Makefile.in: Add a dependency of ira-conflicts.o on
addresses.h.
(ira_build_conflicts): Use base_reg_class instead of BASE_REG_CLASS.
* Makefile.in: Add a dependency of ira-conflicts.o on addresses.h.
2009-01-13 Vladimir Makarov <vmakarov@redhat.com>
@ -337,13 +336,13 @@
2009-01-13 Richard Earnshaw <rearnsha@arm.com>
* arm.c (output_move_double): Don't synthesize thumb-2 ldrd/strd with
two 32-bit instructions.
* config/arm/arm.c (output_move_double): Don't synthesize thumb-2
ldrd/strd with two 32-bit instructions.
2009-01-13 Richard Earnshaw <rearnsha@arm.com>
* arm.c (struct processors): Pass for speed down into cost helper
functions.
* config/arm/arm.c (struct processors): Pass for speed down into
cost helper functions.
(const_ok_for_op): Handle COMPARE and inequality nodes.
(arm_rtx_costs_1): Rewrite.
(arm_size_rtx_costs): Update prototype.
@ -355,7 +354,7 @@
2009-01-13 Uros Bizjak <ubizjak@gmail.com>
* config/alpha/alpha.c (alpha_legitimate_address_p): Explicit
relocations of local symbols wider than UNITS_PER_WORD are not valid.
relocations of local symbols wider than UNITS_PER_WORD are not valid.
(alpha_legitimize_address): Do not split local symbols wider than
UNITS_PER_WORD into HIGH/LO_SUM parts.
@ -652,7 +651,7 @@
2009-01-06 Jan Hubicka <jh@suse.cz>
PR target/38744
* i386.c (ix86_expand_call): Use ARRAY_SIZE.
* config/i386/i386.c (ix86_expand_call): Use ARRAY_SIZE.
2009-01-06 Gerald Pfeifer <gerald@pfeifer.com>
@ -662,14 +661,15 @@
2009-01-06 Jan Hubicka <jh@suse.cz>
Kai Tietz <kai.tietz@onevision.com>
* i386.md (*msabi_syvabi): Add SSE regs clobbers.
* i386.c (ix86_expand_call): Add clobbers.
* config/i386/i386.md (*msabi_syvabi): Add SSE regs clobbers.
* config/i386/i386.c (ix86_expand_call): Add clobbers.
2009-01-06 Jan Hubicka <jh@suse.cz>
Kai Tietz <kai.tietz@onevision.com>
* i386.h (CONDITIONAL_CALL_USAGE): SSE regs are not used for w64 ABI.
* i386.c (struct ix86_frame): Add padding0 and nsseregs.
* config/i386/i386.h (CONDITIONAL_CALL_USAGE): SSE regs are not used
for w64 ABI.
* config/i386/i386.c (struct ix86_frame): Add padding0 and nsseregs.
(ix86_nsaved_regs): Count only general purpose regs.
(ix86_nsaved_sseregs): New.
(ix86_compute_frame_layout): Update nsseregs; set preferred alignment
@ -685,9 +685,9 @@
2009-01-06 Jan Hubicka <jh@suse.cz>
Kai Tietz <kai.tietz@onevision.com>
* i386.h (ACCUMULATE_OUTGOING_ARGS): Enable for MSABI
* i386.c (init_cumulative_args): Disallow calls of MSABI functions
when accumulate outgoing args is off.
* config/i386/i386.h (ACCUMULATE_OUTGOING_ARGS): Enable for MSABI
* config/i386/i386.c (init_cumulative_args): Disallow calls of MSABI
functions when accumulate outgoing args is off.
2009-01-06 H.J. Lu <hongjiu.lu@intel.com>

39
gcc/alias.c
View file

@ -1559,26 +1559,27 @@ base_alias_check (rtx x, rtx y, enum machine_mode x_mode,
if (rtx_equal_p (x_base, y_base))
return 1;
/* The base addresses of the read and write are different expressions.
If they are both symbols and they are not accessed via AND, there is
no conflict. We can bring knowledge of object alignment into play
here. For example, on alpha, "char a, b;" can alias one another,
though "char a; long b;" cannot. */
/* The base addresses are different expressions. If they are not accessed
via AND, there is no conflict. We can bring knowledge of object
alignment into play here. For example, on alpha, "char a, b;" can
alias one another, though "char a; long b;" cannot. AND addesses may
implicitly alias surrounding objects; i.e. unaligned access in DImode
via AND address can alias all surrounding object types except those
with aligment 8 or higher. */
if (GET_CODE (x) == AND && GET_CODE (y) == AND)
return 1;
if (GET_CODE (x) == AND
&& (GET_CODE (XEXP (x, 1)) != CONST_INT
|| (int) GET_MODE_UNIT_SIZE (y_mode) < -INTVAL (XEXP (x, 1))))
return 1;
if (GET_CODE (y) == AND
&& (GET_CODE (XEXP (y, 1)) != CONST_INT
|| (int) GET_MODE_UNIT_SIZE (x_mode) < -INTVAL (XEXP (y, 1))))
return 1;
/* Differing symbols not accessed via AND never alias. */
if (GET_CODE (x_base) != ADDRESS && GET_CODE (y_base) != ADDRESS)
{
if (GET_CODE (x) == AND && GET_CODE (y) == AND)
return 1;
if (GET_CODE (x) == AND
&& (GET_CODE (XEXP (x, 1)) != CONST_INT
|| (int) GET_MODE_UNIT_SIZE (y_mode) < -INTVAL (XEXP (x, 1))))
return 1;
if (GET_CODE (y) == AND
&& (GET_CODE (XEXP (y, 1)) != CONST_INT
|| (int) GET_MODE_UNIT_SIZE (x_mode) < -INTVAL (XEXP (y, 1))))
return 1;
/* Differing symbols never alias. */
return 0;
}
return 0;
/* If one address is a stack reference there can be no alias:
stack references using different base registers do not alias,