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sh.c (sh_expand_prologue, [...]): If TARGET_DOUBLE_ALIGN, preserve 64 bit stack alignment.

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* sh.c (sh_expand_prologue, sh_expand_epilogue):
        If TARGET_DOUBLE_ALIGN, preserve 64 bit stack alignment.
        * sh.h (STACK_BOUNDARY): Likewise.

From-SVN: r19430
This commit is contained in:
J"orn Rennecke 1998-04-27 10:26:39 +00:00 committed by Joern Rennecke
parent 515d3c1783
commit 3d5a082089
4 changed files with 28 additions and 6 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Mon Apr 27 18:23:51 1998 J"orn Rennecke <amylaar@cygnus.co.uk>
* sh.c (sh_expand_prologue, sh_expand_epilogue):
If TARGET_DOUBLE_ALIGN, preserve 64 bit stack alignment.
* sh.h (STACK_BOUNDARY): Likewise.
Mon Apr 27 17:22:48 1998 J"orn Rennecke <amylaar@cygnus.co.uk>
* sh.h (LEGITIMIZE_RELOAD_ADDRESS): Define.

19
gcc/config/sh/sh.c
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@ -3467,6 +3467,7 @@ sh_expand_prologue ()
int live_regs_mask;
int d, i;
int live_regs_mask2;
int double_align = 0;
/* We have pretend args if we had an object sent partially in registers
and partially on the stack, e.g. a large structure. */
@ -3505,7 +3506,11 @@ sh_expand_prologue ()
live_regs_mask = calc_live_regs (&d, &live_regs_mask2);
push_regs (live_regs_mask, live_regs_mask2);
output_stack_adjust (-get_frame_size (), stack_pointer_rtx, 3);
if (TARGET_ALIGN_DOUBLE && d & 1)
double_align = 4;
output_stack_adjust (-get_frame_size () - double_align,
stack_pointer_rtx, 3);
if (frame_pointer_needed)
emit_insn (gen_movsi (frame_pointer_rtx, stack_pointer_rtx));
@ -3518,10 +3523,16 @@ sh_expand_epilogue ()
int d, i;
int live_regs_mask2;
int frame_size = get_frame_size ();
live_regs_mask = calc_live_regs (&d, &live_regs_mask2);
if (TARGET_ALIGN_DOUBLE && d & 1)
frame_size += 4;
if (frame_pointer_needed)
{
output_stack_adjust (get_frame_size (), frame_pointer_rtx, 7);
output_stack_adjust (frame_size, frame_pointer_rtx, 7);
/* We must avoid moving the stack pointer adjustment past code
which reads from the local frame, else an interrupt could
@ -3530,14 +3541,14 @@ sh_expand_epilogue ()
emit_insn (gen_blockage ());
emit_insn (gen_movsi (stack_pointer_rtx, frame_pointer_rtx));
}
else if (get_frame_size ())
else if (frame_size)
{
/* We must avoid moving the stack pointer adjustment past code
which reads from the local frame, else an interrupt could
occur after the SP adjustment and clobber data in the local
frame. */
emit_insn (gen_blockage ());
output_stack_adjust (get_frame_size (), stack_pointer_rtx, 7);
output_stack_adjust (frame_size, stack_pointer_rtx, 7);
}
/* Pop all the registers. */

2
gcc/config/sh/sh.h
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@ -231,7 +231,7 @@ do { \
#define PARM_BOUNDARY 32
/* Boundary (in *bits*) on which stack pointer should be aligned. */
#define STACK_BOUNDARY 32
#define STACK_BOUNDARY BIGGEST_ALIGNMENT
/* The log (base 2) of the cache line size, in bytes. Processors prior to
SH3 have no actual cache, but they fetch code in chunks of 4 bytes. */

7
gcc/invoke.texi
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@ -371,7 +371,7 @@ in the following sections.
-mrelax -mh -ms -mint32 -malign-300
@emph{SH Options}
-m1 -m2 -m3 -m3e -mb -ml -mrelax
-m1 -m2 -m3 -m3e -mb -ml -mdalign -mrelax
@emph{System V Options}
-Qy -Qn -YP,@var{paths} -Ym,@var{dir}
@ -5373,6 +5373,11 @@ Compile code for the processor in big endian mode.
@item -ml
Compile code for the processor in little endian mode.
@item -mdalign
Align doubles at 64 bit boundaries. Note that this changes the calling
conventions, and thus some functions from the standard C library will
not work unless you recompile it first with -mdalign.
@item -mrelax
Shorten some address references at link time, when possible; uses the
linker option @samp{-relax}.