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gcc/
* config/arm/arm.c (arm_override_options): Override alignments if
tuning for Cortex-A8.
(create_fix_barrier, arm_reorg): If aligning to jumps or loops,
make labels have a size.
* config/arm/arm.md (VUNSPEC_ALIGN16, VUNSPEC_ALIGN32): New constants.
(align_16, align_32): New patterns.
2010-07-26 Julian Brown <julian@codesourcery.com>
Merge from Sourcery G++ 4.4:
Mark Shinwell <shinwell@codesourcery.com>
=== modified file 'gcc/config/arm/arm.c'
--- old/gcc/config/arm/arm.c 2010-08-10 14:03:02 +0000
+++ new/gcc/config/arm/arm.c 2010-08-12 11:33:54 +0000
@@ -1449,6 +1449,16 @@
chosen. */
gcc_assert (arm_tune != arm_none);
+ if (arm_tune == cortexa8 && optimize >= 3)
+ {
+ /* These alignments were experimentally determined to improve SPECint
+ performance on SPECCPU 2000. */
+ if (align_functions <= 0)
+ align_functions = 16;
+ if (align_jumps <= 0)
+ align_jumps = 16;
+ }
+
tune_flags = all_cores[(int)arm_tune].flags;
if (target_fp16_format_name)
@@ -11263,7 +11273,10 @@
gcc_assert (GET_CODE (from) != BARRIER);
/* Count the length of this insn. */
- count += get_attr_length (from);
+ if (LABEL_P (from) && (align_jumps > 0 || align_loops > 0))
+ count += MAX (align_jumps, align_loops);
+ else
+ count += get_attr_length (from);
/* If there is a jump table, add its length. */
tmp = is_jump_table (from);
@@ -11603,6 +11616,8 @@
insn = table;
}
}
+ else if (LABEL_P (insn) && (align_jumps > 0 || align_loops > 0))
+ address += MAX (align_jumps, align_loops);
}
fix = minipool_fix_head;
=== modified file 'gcc/config/arm/arm.md'
--- old/gcc/config/arm/arm.md 2010-08-12 11:29:02 +0000
+++ new/gcc/config/arm/arm.md 2010-08-12 11:33:54 +0000
@@ -135,6 +135,8 @@
(VUNSPEC_WCMP_EQ 12) ; Used by the iWMMXt WCMPEQ instructions
(VUNSPEC_WCMP_GTU 13) ; Used by the iWMMXt WCMPGTU instructions
(VUNSPEC_WCMP_GT 14) ; Used by the iwMMXT WCMPGT instructions
+ (VUNSPEC_ALIGN16 15) ; Used to force 16-byte alignment.
+ (VUNSPEC_ALIGN32 16) ; Used to force 32-byte alignment.
(VUNSPEC_EH_RETURN 20); Use to override the return address for exception
; handling.
]
@@ -11042,6 +11044,24 @@
"
)
+(define_insn "align_16"
+ [(unspec_volatile [(const_int 0)] VUNSPEC_ALIGN16)]
+ "TARGET_EITHER"
+ "*
+ assemble_align (128);
+ return \"\";
+ "
+)
+
+(define_insn "align_32"
+ [(unspec_volatile [(const_int 0)] VUNSPEC_ALIGN32)]
+ "TARGET_EITHER"
+ "*
+ assemble_align (256);
+ return \"\";
+ "
+)
+
(define_insn "consttable_end"
[(unspec_volatile [(const_int 0)] VUNSPEC_POOL_END)]
"TARGET_EITHER"
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