mirror/gcc
2
0
Fork 0
mirror of git://gcc.gnu.org/git/gcc.git synced 2025-01-30 13:39:46 +08:00
Code Issues Packages Projects Releases Wiki Activity

(TARGET_SCHEDULE_PROLOGUE): New to allow prologue to be emitted as asm or rtl.

Browse Source 
From-SVN: r12275
This commit is contained in:
Stan Cox 1996-06-11 19:28:11 +00:00
parent 68ea97b42a
commit 983f168571
1 changed files with 68 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

82
gcc/config/i386/i386.c
View File

@ -294,6 +294,10 @@ override_options ()
if (TARGET_OMIT_LEAF_FRAME_POINTER) /* keep nonleaf frame pointers */
flag_omit_frame_pointer = 1;
/* pic references don't explicitly mention pic_offset_table_rtx */
if (flag_pic)
target_flags &= ~MASK_SCHEDULE_PROLOGUE;
}
/* A C statement (sans semicolon) to choose the order in which to
@ -1709,6 +1713,67 @@ function_prologue (file, size)
FILE *file;
int size;
{
register int regno;
int limit;
rtx xops[4];
int pic_reg_used = flag_pic && (current_function_uses_pic_offset_table
|| current_function_uses_const_pool);
long tsize = get_frame_size ();
/* pic references don't explicitly mention pic_offset_table_rtx */
if (TARGET_SCHEDULE_PROLOGUE)
return;
xops[0] = stack_pointer_rtx;
xops[1] = frame_pointer_rtx;
xops[2] = GEN_INT (tsize);
if (frame_pointer_needed)
{
output_asm_insn ("push%L1 %1", xops);
output_asm_insn (AS2 (mov%L0,%0,%1), xops);
}
if (tsize)
output_asm_insn (AS2 (sub%L0,%2,%0), xops);
/* Note If use enter it is NOT reversed args.
This one is not reversed from intel!!
I think enter is slower. Also sdb doesn't like it.
But if you want it the code is:
{
xops[3] = const0_rtx;
output_asm_insn ("enter %2,%3", xops);
}
*/
limit = (frame_pointer_needed ? FRAME_POINTER_REGNUM : STACK_POINTER_REGNUM);
for (regno = limit - 1; regno >= 0; regno--)
if ((regs_ever_live[regno] && ! call_used_regs[regno])
|| (regno == PIC_OFFSET_TABLE_REGNUM && pic_reg_used))
{
xops[0] = gen_rtx (REG, SImode, regno);
output_asm_insn ("push%L0 %0", xops);
}
if (pic_reg_used && TARGET_DEEP_BRANCH_PREDICTION)
{
xops[0] = pic_offset_table_rtx;
if (pic_label_rtx == 0)
pic_label_rtx = (rtx) gen_label_rtx ();
xops[1] = pic_label_rtx;
output_asm_insn (AS1 (call,%P1), xops);
output_asm_insn ("addl $_GLOBAL_OFFSET_TABLE_,%0", xops);
}
else if (pic_reg_used)
{
xops[0] = pic_offset_table_rtx;
xops[1] = (rtx) gen_label_rtx ();
output_asm_insn (AS1 (call,%P1), xops);
ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (xops[1]));
output_asm_insn (AS1 (pop%L0,%0), xops);
output_asm_insn ("addl $_GLOBAL_OFFSET_TABLE_+[.-%P1],%0", xops);
}
}
/* This function generates the assembly code for function entry.
@ -1725,6 +1790,9 @@ ix86_expand_prologue ()
|| current_function_uses_const_pool);
long tsize = get_frame_size ();
if (!TARGET_SCHEDULE_PROLOGUE)
return;
xops[0] = stack_pointer_rtx;
xops[1] = frame_pointer_rtx;
xops[2] = GEN_INT (tsize);
@ -1735,8 +1803,6 @@ ix86_expand_prologue ()
gen_rtx (PRE_DEC, SImode, stack_pointer_rtx)),
frame_pointer_rtx));
emit_move_insn (xops[1], xops[0]);
/* output_asm_insn ("push%L1 %1", xops); */
/* output_asm_insn (AS2 (mov%L0,%0,%1), xops); */
}
if (tsize)
@ -1746,8 +1812,6 @@ ix86_expand_prologue ()
xops[0],
xops[2])));
/* output_asm_insn (AS2 (sub%L0,%2,%0), xops);*/
/* Note If use enter it is NOT reversed args.
This one is not reversed from intel!!
I think enter is slower. Also sdb doesn't like it.
@ -1767,7 +1831,6 @@ ix86_expand_prologue ()
gen_rtx (MEM, SImode,
gen_rtx (PRE_DEC, SImode, stack_pointer_rtx)),
xops[0]));
/* output_asm_insn ("push%L0 %0", xops);*/
}
if (pic_reg_used && TARGET_DEEP_BRANCH_PREDICTION)
@ -1778,12 +1841,9 @@ ix86_expand_prologue ()
xops[1] = pic_label_rtx;
emit_insn (gen_prologue_get_pc (xops[0], gen_rtx (CONST_INT, Pmode, CODE_LABEL_NUMBER(xops[1]))));
/* output_asm_insn (AS1 (call,%P1), xops);*/
emit_insn (gen_prologue_set_got (xops[0],
gen_rtx (SYMBOL_REF, Pmode, "$_GLOBAL_OFFSET_TABLE_"),
gen_rtx (CONST_INT, Pmode, CODE_LABEL_NUMBER(xops[1]))));
SCHED_GROUP_P (get_last_insn()) = 1;
/* output_asm_insn ("addl $_GLOBAL_OFFSET_TABLE_,%0", xops);*/
}
else if (pic_reg_used)
{
@ -1791,16 +1851,10 @@ ix86_expand_prologue ()
xops[1] = (rtx) gen_label_rtx ();
emit_insn (gen_prologue_get_pc (xops[0], gen_rtx (CONST_INT, Pmode, CODE_LABEL_NUMBER(xops[1]))));
SCHED_GROUP_P (get_last_insn()) = 1;
/* output_asm_insn (AS1 (call,%P1), xops);*/
/* ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (xops[1]));*/
emit_insn (gen_pop (xops[0]));
/* output_asm_insn (AS1 (pop%L0,%0), xops);*/
emit_insn (gen_prologue_set_got (xops[0],
gen_rtx (SYMBOL_REF, Pmode, "$_GLOBAL_OFFSET_TABLE_"),
gen_rtx (CONST_INT, Pmode, CODE_LABEL_NUMBER (xops[1]))));
SCHED_GROUP_P (get_last_insn()) = 1;
/* output_asm_insn ("addl $_GLOBAL_OFFSET_TABLE_+[.-%P1],%0", xops);*/
}
}