Hello!
> Updated patches with the suggestions below, except that the initial value is 0
> (which is not meaningful). I also added a setting in rdos target file to use
> r15
> for PIC instead of rbx.
*** gcc-4.8-20121230/gcc/config/i386/i386.c Thu Dec 27 02:58:06 2012
--- gcc-work/gcc/config/i386/i386.c Sun Jan 6 14:10:34 2013
+ if (ix86_section_threshold == 0)
+ ix86_section_threshold = DEFAULT_SECTION_THRESHOLD;
Please see attached patch on how to initialize an option.
*** gcc-4.8-20121230/gcc/config/i386/i386.h Wed Dec 19 17:04:12 2012
--- gcc-work/gcc/config/i386/i386.h Sun Jan 6 13:24:26 2013
+ #define TARGET_MEDIUM_PIC 0
You should just use TARGET_RDOS here (also, please see attached patch).
+ /* Default threshold for putting data in large sections with x86-64
+ medium memory model */
+ #define DEFAULT_SECTION_THRESHOLD 65536
Do not put this define in the middle of i386.h section that deals with
alignment...
*** gcc-4.8-20121230/gcc/config/i386/rdos.h Thu Jan 1 01:00:00 1970
--- gcc-work/gcc/config/i386/rdos.h Sun Jan 6 13:20:12 2013
+ #undef REAL_PIC_OFFSET_TABLE_REGNUM
+ #define REAL_PIC_OFFSET_TABLE_REGNUM R15_REG
Is this header also used for 32bit target? You should not use REX
registers for 32bit targets.
+ #undef TARGET_MEDIUM_PIC
+ #define TARGET_MEDIUM_PIC 1
TARGET_RDOS
+ #define DEFAULT_SECTION_THRESHOLD 0x10
No hex numbers here. Also, you will need to #undef this first to
override the default in i386.h.
*** gcc-4.8-20121230/gcc/config.gcc Thu Nov 22 00:33:40 2012
--- gcc-work/gcc/config.gcc Fri Jan 4 21:08:46 2013
+ i[34567]86-*-rdos*)
+ tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h
newlib-stdint.h"
+ ;;
You forgot to include i386/rdos.h here (other headers too?). It is
needed at least for TARGET_EXECUTABLE_SUFFIX define.
Uros.
Index: i386.c
===================================================================
--- i386.c (revision 194945)
+++ i386.c (working copy)
@@ -3239,6 +3239,8 @@
DLL, and is essentially just as efficient as direct addressing. */
if (TARGET_64BIT && DEFAULT_ABI == MS_ABI)
ix86_cmodel = CM_SMALL_PIC, flag_pic = 1;
+ else if (TARGET_64BIT && TARGET_RDOS)
+ ix86_cmodel = CM_MEDIUM_PIC, flag_pic = 1;
else if (TARGET_64BIT)
ix86_cmodel = flag_pic ? CM_SMALL_PIC : CM_SMALL;
else
Index: i386.h
===================================================================
--- i386.h (revision 194945)
+++ i386.h (working copy)
@@ -519,6 +519,9 @@
#define MACHOPIC_INDIRECT 0
#define MACHOPIC_PURE 0
+/* For the RDOS */
+#define TARGET_RDOS 0
+
/* For the Windows 64-bit ABI. */
#define TARGET_64BIT_MS_ABI (TARGET_64BIT && ix86_cfun_abi () == MS_ABI)
@@ -2081,6 +2084,10 @@
asm (SECTION_OP "\n\t" \
"call " CRT_MKSTR(__USER_LABEL_PREFIX__) #FUNC "\n" \
TEXT_SECTION_ASM_OP);
+
+/* Default threshold for putting data in large sections
+ with x86-64 medium memory model */
+#define DEFAULT_LARGE_SECTION_THRESHOLD 65536
/* Which processor to tune code generation for. */
Index: i386.opt
===================================================================
--- i386.opt (revision 194945)
+++ i386.opt (working copy)
@@ -141,7 +141,7 @@
Branches are this expensive (1-5, arbitrary units)
mlarge-data-threshold=
-Target RejectNegative Joined UInteger Var(ix86_section_threshold) Init(65536)
+Target RejectNegative Joined UInteger Var(ix86_section_threshold)
Init(DEFAULT_LARGE_SECTION_THRESHOLD)
Data greater than given threshold will go into .ldata section in x86-64 medium
model
mcmodel=
