* [PATCH] AIX code CSECT alignment
@ 2021-06-30 0:38 David Edelsohn
0 siblings, 0 replies; only message in thread
From: David Edelsohn @ 2021-06-30 0:38 UTC (permalink / raw)
To: GCC Patches
aix: align text CSECTs to at least 32 bytes.
Bootstrapped on powerpc-ibm-aix7.2.3.0.
Thanks, David
gcc/ChangeLog:
* config/rs6000/rs6000.c (rs6000_xcoff_section_type_flags):
Increase code CSECT alignment to at least 32 bytes.
* config/rs6000/xcoff.h (TEXT_SECTION_ASM_OP): Add 32 byte
alignment designation.
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 2c249e186e1..075c156ae13 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
/* Subroutines used for code generation on IBM RS/6000.
Copyright (C) 1991-2021 Free Software Foundation, Inc.
Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
@@ -21361,8 +21362,11 @@ rs6000_xcoff_section_type_flags (tree decl,
const char *name, int reloc)
flags |= SECTION_BSS;
/* Align to at least UNIT size. */
- if ((flags & SECTION_CODE) != 0 || !decl || !DECL_P (decl))
+ if (!decl || !DECL_P (decl))
align = MIN_UNITS_PER_WORD;
+ /* Align code CSECT to at least 32 bytes. */
+ else if ((flags & SECTION_CODE) != 0)
+ align = MAX ((DECL_ALIGN (decl) / BITS_PER_UNIT), 32);
else
/* Increase alignment of large objects if not already stricter. */
align = MAX ((DECL_ALIGN (decl) / BITS_PER_UNIT),
diff --git a/gcc/config/rs6000/xcoff.h b/gcc/config/rs6000/xcoff.h
index 5ba565f63bb..f3546fadf33 100644
--- a/gcc/config/rs6000/xcoff.h
+++ b/gcc/config/rs6000/xcoff.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
/* Definitions of target machine for GNU compiler,
for some generic XCOFF file format
Copyright (C) 2001-2021 Free Software Foundation, Inc.
@@ -249,7 +250,7 @@
#define DOUBLE_INT_ASM_OP "\t.llong\t"
/* Output before instructions. */
-#define TEXT_SECTION_ASM_OP "\t.csect .text[PR]"
+#define TEXT_SECTION_ASM_OP "\t.csect .text[PR],5"
/* Output before writable data. */
#define DATA_SECTION_ASM_OP \
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2021-06-30 0:38 [PATCH] AIX code CSECT alignment David Edelsohn
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