[PATCH] AIX code CSECT alignment

[PATCH] AIX code CSECT alignment

[David Edelsohn]

    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 \