Hi,
This patch is a backport of the section anchors support introduced
to aarch64-branch here:
http://gcc.gnu.org/ml/gcc-patches/2012-09/msg00384.html
The patch has been tested for aarch64-none-elf with only a known
regression, fixed by backporting this patch by Andrew Pinski:
http://gcc.gnu.org/ml/gcc-patches/2012-11/msg00580.html
Is this OK to commit to aarch64-4.7-branch?
Thanks,
James Greenhalgh
---
gcc/
2013-02-13 James Greenhalgh <[email protected]>
Backport from aarch64-branch.
2012-09-06 James Greenhalgh <[email protected]>
Richard Earnshaw <[email protected]>
* common/config/aarch64/aarch64-common.c
(aarch_option_optimization_table): New.
(TARGET_OPTION_OPTIMIZATION_TABLE): Define.
* gcc/config/aarch64/aarch64-elf.h (ASM_OUTPUT_DEF): New definition.
* gcc/config/aarch64/aarch64.c (TARGET_MIN_ANCHOR_OFFSET): Define.
(TARGET_MAX_ANCHOR_OFFSET): Likewise.
diff --git a/gcc/common/config/aarch64/aarch64-common.c b/gcc/common/config/aarch64/aarch64-common.c
index df72406..bd249e1 100644
--- a/gcc/common/config/aarch64/aarch64-common.c
+++ b/gcc/common/config/aarch64/aarch64-common.c
@@ -36,6 +36,17 @@
#undef TARGET_HANDLE_OPTION
#define TARGET_HANDLE_OPTION aarch64_handle_option
+#undef TARGET_OPTION_OPTIMIZATION_TABLE
+#define TARGET_OPTION_OPTIMIZATION_TABLE aarch_option_optimization_table
+
+/* Set default optimization options. */
+static const struct default_options aarch_option_optimization_table[] =
+ {
+ /* Enable section anchors by default at -O1 or higher. */
+ { OPT_LEVELS_1_PLUS, OPT_fsection_anchors, NULL, 1 },
+ { OPT_LEVELS_NONE, 0, NULL, 0 }
+ };
+
/* Implement TARGET_HANDLE_OPTION.
This function handles the target specific options for CPU/target selection.
diff --git a/gcc/config/aarch64/aarch64-elf.h b/gcc/config/aarch64/aarch64-elf.h
index 6d8b933..1c021d0 100644
--- a/gcc/config/aarch64/aarch64-elf.h
+++ b/gcc/config/aarch64/aarch64-elf.h
@@ -25,6 +25,15 @@
#define ASM_OUTPUT_LABELREF(FILE, NAME) \
aarch64_asm_output_labelref (FILE, NAME)
+#define ASM_OUTPUT_DEF(FILE, NAME1, NAME2) \
+ do \
+ { \
+ assemble_name (FILE, NAME1); \
+ fputs (" = ", FILE); \
+ assemble_name (FILE, NAME2); \
+ fputc ('\n', FILE); \
+ } while (0)
+
#define TEXT_SECTION_ASM_OP "\t.text"
#define DATA_SECTION_ASM_OP "\t.data"
#define BSS_SECTION_ASM_OP "\t.bss"
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 1e546cc..ed5b6bb 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -7950,6 +7950,17 @@ aarch64_vectorize_vec_perm_const_ok (enum machine_mode vmode,
#define TARGET_VECTORIZE_VEC_PERM_CONST_OK \
aarch64_vectorize_vec_perm_const_ok
+/* Section anchor support. */
+
+#undef TARGET_MIN_ANCHOR_OFFSET
+#define TARGET_MIN_ANCHOR_OFFSET -256
+
+/* Limit the maximum anchor offset to 4k-1, since that's the limit for a
+ byte offset; we can do much more for larger data types, but have no way
+ to determine the size of the access. We assume accesses are aligned. */
+#undef TARGET_MAX_ANCHOR_OFFSET
+#define TARGET_MAX_ANCHOR_OFFSET 4095
+
struct gcc_target targetm = TARGET_INITIALIZER;
#include "gt-aarch64.h"
