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-rw-r--r--gcc/ChangeLog17
-rw-r--r--gcc/config/pa/pa.c80
-rw-r--r--gcc/config/pa/pa.h15
-rw-r--r--gcc/doc/tm.texi10
-rw-r--r--gcc/function.c29
5 files changed, 108 insertions, 43 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c803640..adc47bf 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,20 @@
+2003-03-04 John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
+
+ * function.c (STACK_ALIGNMENT_NEEDED): New macro. Default to 1.
+ (assign_stack_local_1): Perform overall stack alignment only when
+ STACK_ALIGNMENT_NEEDED is non-zero.
+ * doc/tm.texi (STACK_ALIGNMENT_NEEDED): Document.
+
+ * pa.c (compute_frame_size): Rename fsize to size. Account for
+ alignment to a word boundary before general register save block. Only
+ account for double-word alignment before floating point register save
+ block if one or more are saved. Don't allocate space for %r3 when
+ frame pointer is needed.
+ (hppa_expand_prologue): Include alignment to word boundary in local
+ frame size.
+ * pa.h (STARTING_FRAME_OFFSET): Define to 8 on both 32 and 64-bit ports.
+ (STACK_ALIGNMENT_NEEDED): Define.
+
2003-03-04 Kevin Buettner <kevinb@redhat.com>
* dwarf2out.c (rtl_for_decl_location): Don't return NULL_RTX for
diff --git a/gcc/config/pa/pa.c b/gcc/config/pa/pa.c
index 27b218c..0f1b894 100644
--- a/gcc/config/pa/pa.c
+++ b/gcc/config/pa/pa.c
@@ -3195,15 +3195,24 @@ compute_frame_size (size, fregs_live)
int size;
int *fregs_live;
{
- int i, fsize;
-
- /* Space for frame pointer + filler. If any frame is allocated
- we need to add this in because of STARTING_FRAME_OFFSET.
-
- Similar code also appears in hppa_expand_prologue. Change both
- of them at the same time. */
- fsize = size + (size || frame_pointer_needed ? STARTING_FRAME_OFFSET : 0);
-
+ int freg_saved = 0;
+ int i, j;
+
+ /* The code in hppa_expand_prologue and hppa_expand_epilogue must
+ be consistent with the rounding and size calculation done here.
+ Change them at the same time. */
+
+ /* We do our own stack alignment. First, round the size of the
+ stack locals up to a word boundary. */
+ size = (size + UNITS_PER_WORD - 1) & ~(UNITS_PER_WORD - 1);
+
+ /* Space for previous frame pointer + filler. If any frame is
+ allocated, we need to add in the STARTING_FRAME_OFFSET. We
+ waste some space here for the sake of HP compatibility. The
+ first slot is only used when the frame pointer is needed. */
+ if (size || frame_pointer_needed)
+ size += STARTING_FRAME_OFFSET;
+
/* If the current function calls __builtin_eh_return, then we need
to allocate stack space for registers that will hold data for
the exception handler. */
@@ -3213,41 +3222,49 @@ compute_frame_size (size, fregs_live)
for (i = 0; EH_RETURN_DATA_REGNO (i) != INVALID_REGNUM; ++i)
continue;
- fsize += i * UNITS_PER_WORD;
+ size += i * UNITS_PER_WORD;
}
/* Account for space used by the callee general register saves. */
- for (i = 18; i >= 3; i--)
+ for (i = 18, j = frame_pointer_needed ? 4 : 3; i >= j; i--)
if (regs_ever_live[i])
- fsize += UNITS_PER_WORD;
-
- /* Round the stack. */
- fsize = (fsize + 7) & ~7;
+ size += UNITS_PER_WORD;
/* Account for space used by the callee floating point register saves. */
for (i = FP_SAVED_REG_LAST; i >= FP_SAVED_REG_FIRST; i -= FP_REG_STEP)
if (regs_ever_live[i]
- || (! TARGET_64BIT && regs_ever_live[i + 1]))
+ || (!TARGET_64BIT && regs_ever_live[i + 1]))
{
- if (fregs_live)
- *fregs_live = 1;
+ freg_saved = 1;
/* We always save both halves of the FP register, so always
increment the frame size by 8 bytes. */
- fsize += 8;
+ size += 8;
}
+ /* If any of the floating registers are saved, account for the
+ alignment needed for the floating point register save block. */
+ if (freg_saved)
+ {
+ size = (size + 7) & ~7;
+ if (fregs_live)
+ *fregs_live = 1;
+ }
+
/* The various ABIs include space for the outgoing parameters in the
- size of the current function's stack frame. */
- fsize += current_function_outgoing_args_size;
+ size of the current function's stack frame. We don't need to align
+ for the outgoing arguments as their alignment is set by the final
+ rounding for the frame as a whole. */
+ size += current_function_outgoing_args_size;
/* Allocate space for the fixed frame marker. This space must be
allocated for any function that makes calls or otherwise allocates
stack space. */
- if (!current_function_is_leaf || fsize)
- fsize += TARGET_64BIT ? 16 : 32;
+ if (!current_function_is_leaf || size)
+ size += TARGET_64BIT ? 16 : 32;
- return ((fsize + PREFERRED_STACK_BOUNDARY / 8 - 1)
+ /* Finally, round to the preferred stack boundary. */
+ return ((size + PREFERRED_STACK_BOUNDARY / 8 - 1)
& ~(PREFERRED_STACK_BOUNDARY / 8 - 1));
}
@@ -3313,8 +3330,8 @@ pa_output_function_prologue (file, size)
void
hppa_expand_prologue ()
{
- int size = get_frame_size ();
int merge_sp_adjust_with_store = 0;
+ int size = get_frame_size ();
int i, offset;
rtx insn, tmpreg;
@@ -3322,13 +3339,12 @@ hppa_expand_prologue ()
fr_saved = 0;
save_fregs = 0;
- /* Allocate space for frame pointer + filler. If any frame is allocated
- we need to add this in because of STARTING_FRAME_OFFSET.
-
- Similar code also appears in compute_frame_size. Change both
- of them at the same time. */
- local_fsize = size + (size || frame_pointer_needed
- ? STARTING_FRAME_OFFSET : 0);
+ /* Compute total size for frame pointer, filler, locals and rounding to
+ the next word boundary. Similar code appears in compute_frame_size
+ and must be changed in tandem with this code. */
+ local_fsize = (size + UNITS_PER_WORD - 1) & ~(UNITS_PER_WORD - 1);
+ if (local_fsize || frame_pointer_needed)
+ local_fsize += STARTING_FRAME_OFFSET;
actual_fsize = compute_frame_size (size, &save_fregs);
diff --git a/gcc/config/pa/pa.h b/gcc/config/pa/pa.h
index 0b055e9..ba533ff 100644
--- a/gcc/config/pa/pa.h
+++ b/gcc/config/pa/pa.h
@@ -676,10 +676,17 @@ extern struct rtx_def *hppa_pic_save_rtx PARAMS ((void));
/* Offset within stack frame to start allocating local variables at.
If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
first local allocated. Otherwise, it is the offset to the BEGINNING
- of the first local allocated. The start of the locals must lie on
- a STACK_BOUNDARY or else the frame size of leaf functions will not
- be zero. */
-#define STARTING_FRAME_OFFSET (TARGET_64BIT ? 16 : 8)
+ of the first local allocated.
+
+ On the 32-bit ports, we reserve one slot for the previous frame
+ pointer and one fill slot. The fill slot is for compatibility
+ with HP compiled programs. On the 64-bit ports, we reserve one
+ slot for the previous frame pointer. */
+#define STARTING_FRAME_OFFSET 8
+
+/* Define STACK_ALIGNMENT_NEEDED to zero to disable final alignment
+ of the stack. The default is to align it to STACK_BOUNDARY. */
+#define STACK_ALIGNMENT_NEEDED 0
/* If we generate an insn to push BYTES bytes,
this says how many the stack pointer really advances by.
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index a3c68a2..2d20c4f 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -2816,6 +2816,16 @@ value @code{STARTING_FRAME_OFFSET}.
@c i'm not sure if the above is still correct.. had to change it to get
@c rid of an overfull. --mew 2feb93
+@findex STACK_ALIGNMENT_NEEDED
+@item STACK_ALIGNMENT_NEEDED
+Define to zero to disable final alignment of the stack during reload.
+The non-zero default for this macro is suitable for most ports.
+
+On ports where @code{STARTING_FRAME_OFFSET} is non-zero or where there
+is a register save block following the local block that doesn't require
+alignment to @code{STACK_BOUNDARY}, it may be beneficial to disable
+stack alignment and do it in the backend.
+
@findex STACK_POINTER_OFFSET
@item STACK_POINTER_OFFSET
Offset from the stack pointer register to the first location at which
diff --git a/gcc/function.c b/gcc/function.c
index 851dd24..73527bc 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -70,6 +70,10 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
#define LOCAL_ALIGNMENT(TYPE, ALIGNMENT) ALIGNMENT
#endif
+#ifndef STACK_ALIGNMENT_NEEDED
+#define STACK_ALIGNMENT_NEEDED 1
+#endif
+
/* Some systems use __main in a way incompatible with its use in gcc, in these
cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to
give the same symbol without quotes for an alternative entry point. You
@@ -566,16 +570,27 @@ assign_stack_local_1 (mode, size, align, function)
frame_off = STARTING_FRAME_OFFSET % frame_alignment;
frame_phase = frame_off ? frame_alignment - frame_off : 0;
- /* Round frame offset to that alignment.
- We must be careful here, since FRAME_OFFSET might be negative and
- division with a negative dividend isn't as well defined as we might
- like. So we instead assume that ALIGNMENT is a power of two and
- use logical operations which are unambiguous. */
+ /* Round the frame offset to the specified alignment. The default is
+ to always honor requests to align the stack but a port may choose to
+ do its own stack alignment by defining STACK_ALIGNMENT_NEEDED. */
+ if (STACK_ALIGNMENT_NEEDED
+ || mode != BLKmode
+ || size != 0)
+ {
+ /* We must be careful here, since FRAME_OFFSET might be negative and
+ division with a negative dividend isn't as well defined as we might
+ like. So we instead assume that ALIGNMENT is a power of two and
+ use logical operations which are unambiguous. */
#ifdef FRAME_GROWS_DOWNWARD
- function->x_frame_offset = FLOOR_ROUND (function->x_frame_offset - frame_phase, alignment) + frame_phase;
+ function->x_frame_offset
+ = (FLOOR_ROUND (function->x_frame_offset - frame_phase, alignment)
+ + frame_phase);
#else
- function->x_frame_offset = CEIL_ROUND (function->x_frame_offset - frame_phase, alignment) + frame_phase;
+ function->x_frame_offset
+ = (CEIL_ROUND (function->x_frame_offset - frame_phase, alignment)
+ + frame_phase);
#endif
+ }
/* On a big-endian machine, if we are allocating more space than we will use,
use the least significant bytes of those that are allocated. */
generated by cgit v1.1 at 2025-05-28 16:37:12 +0000