/* Register to Stack convert for GNU compiler.
- Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+ 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of GCC.
\f
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "tree.h"
#include "rtl.h"
#include "tm_p.h"
#include "basic-block.h"
#include "varray.h"
#include "reload.h"
+#include "ggc.h"
+
+/* We use this array to cache info about insns, because otherwise we
+ spend too much time in stack_regs_mentioned_p.
+
+ Indexed by insn UIDs. A value of zero is uninitialized, one indicates
+ the insn uses stack registers, two indicates the insn does not use
+ stack registers. */
+static GTY(()) varray_type stack_regs_mentioned_data;
#ifdef STACK_REGS
EMIT_BEFORE
};
-/* We use this array to cache info about insns, because otherwise we
- spend too much time in stack_regs_mentioned_p.
-
- Indexed by insn UIDs. A value of zero is uninitialized, one indicates
- the insn uses stack registers, two indicates the insn does not use
- stack registers. */
-static varray_type stack_regs_mentioned_data;
-
/* The block we're currently working on. */
static basic_block current_block;
-/* This is the register file for all register after conversion */
+/* This is the register file for all register after conversion. */
static rtx
FP_mode_reg[LAST_STACK_REG+1-FIRST_STACK_REG][(int) MAX_MACHINE_MODE];
static void record_label_references PARAMS ((rtx, rtx));
static bool compensate_edge PARAMS ((edge, FILE *));
\f
-/* Return non-zero if any stack register is mentioned somewhere within PAT. */
+/* Return nonzero if any stack register is mentioned somewhere within PAT. */
static int
stack_regs_mentioned_p (pat)
return NULL_RTX;
}
\f
-/* Reorganise the stack into ascending numbers,
+/* Reorganize the stack into ascending numbers,
after this insn. */
static void
change_stack (insn, regstack, &temp_stack, EMIT_AFTER);
}
-/* Pop a register from the stack */
+/* Pop a register from the stack. */
static void
pop_stack (regstack, regno)
CLEAR_HARD_REG_BIT (regstack->reg_set, regno);
regstack->top--;
- /* If regno was not at the top of stack then adjust stack */
+ /* If regno was not at the top of stack then adjust stack. */
if (regstack->reg [top] != regno)
{
int i;
code duplication created when the converter inserts pop insns on
the edges. */
-void
+bool
reg_to_stack (first, file)
rtx first;
FILE *file;
{
+ basic_block bb;
int i;
int max_uid;
/* Clean up previous run. */
- if (stack_regs_mentioned_data)
- {
- VARRAY_FREE (stack_regs_mentioned_data);
- stack_regs_mentioned_data = 0;
- }
-
- if (!optimize)
- split_all_insns (0);
+ stack_regs_mentioned_data = 0;
/* See if there is something to do. Flow analysis is quite
expensive so we might save some compilation time. */
if (regs_ever_live[i])
break;
if (i > LAST_STACK_REG)
- return;
+ return false;
/* Ok, floating point instructions exist. If not optimizing,
- build the CFG and run life analysis. */
- if (!optimize)
+ build the CFG and run life analysis.
+ Also need to rebuild life when superblock scheduling is done
+ as it don't update liveness yet. */
+ if (!optimize
+ || (flag_sched2_use_superblocks
+ && flag_schedule_insns_after_reload))
{
- find_basic_blocks (first, max_reg_num (), file);
count_or_remove_death_notes (NULL, 1);
life_analysis (first, file, PROP_DEATH_NOTES);
}
/* Set up block info for each basic block. */
alloc_aux_for_blocks (sizeof (struct block_info_def));
- for (i = n_basic_blocks - 1; i >= 0; --i)
+ FOR_EACH_BB_REVERSE (bb)
{
edge e;
- basic_block bb = BASIC_BLOCK (i);
- for (e = bb->pred; e; e=e->pred_next)
+ for (e = bb->pred; e; e = e->pred_next)
if (!(e->flags & EDGE_DFS_BACK)
&& e->src != ENTRY_BLOCK_PTR)
BLOCK_INFO (bb)->predecessors++;
/* A QNaN for initializing uninitialized variables.
??? We can't load from constant memory in PIC mode, because
- we're insertting these instructions before the prologue and
+ we're inserting these instructions before the prologue and
the PIC register hasn't been set up. In that case, fall back
on zero, which we can get from `ldz'. */
convert_regs (file);
free_aux_for_blocks ();
+ return true;
}
\f
/* Check PAT, which is in INSN, for LABEL_REFs. Add INSN to the
switch (GET_CODE (*pat))
{
case SUBREG:
- /* Eliminate FP subregister accesses in favour of the
+ /* Eliminate FP subregister accesses in favor of the
actual FP register in use. */
{
rtx subreg;
}
}
\f
+/* Set if we find any malformed asms in a block. */
+static bool any_malformed_asm;
+
/* There are many rules that an asm statement for stack-like regs must
follow. Those rules are explained at the top of this file: the rule
numbers below refer to that explanation. */
malformed_asm = 1;
}
- /* Enfore rule #3: If any input operand uses the "f" constraint, all
+ /* Enforce rule #3: If any input operand uses the "f" constraint, all
output constraints must use the "&" earlyclobber.
??? Detect this more deterministically by having constrain_asm_operands
{
/* Avoid further trouble with this insn. */
PATTERN (insn) = gen_rtx_USE (VOIDmode, const0_rtx);
+ any_malformed_asm = true;
return 0;
}
return;
}
- /* The destination ought to be dead */
+ /* The destination ought to be dead. */
if (get_hard_regnum (regstack, dest) >= FIRST_STACK_REG)
abort ();
stack. The stack mapping is changed to reflect that DEST is
now at top of stack. */
- /* The destination ought to be dead */
+ /* The destination ought to be dead. */
if (get_hard_regnum (regstack, dest) >= FIRST_STACK_REG)
abort ();
if (GET_CODE (pat) == SET
&& GET_CODE (SET_SRC (pat)) == UNSPEC
- && XINT (SET_SRC (pat), 1) == 9)
+ && XINT (SET_SRC (pat), 1) == UNSPEC_FNSTSW)
{
rtx dest = SET_DEST (pat);
pat = PATTERN (insn);
if (GET_CODE (pat) != SET
|| GET_CODE (SET_SRC (pat)) != UNSPEC
- || XINT (SET_SRC (pat), 1) != 10
+ || XINT (SET_SRC (pat), 1) != UNSPEC_SAHF
|| ! dead_or_set_p (insn, dest))
return 0;
replace_reg (dest, get_hard_regnum (regstack, *dest));
}
- /* Keep operand 1 maching with destination. */
+ /* Keep operand 1 matching with destination. */
if (GET_RTX_CLASS (GET_CODE (pat_src)) == 'c'
&& REG_P (*src1) && REG_P (*src2)
&& REGNO (*src1) != REGNO (*dest))
case UNSPEC:
switch (XINT (pat_src, 1))
{
- case 1: /* sin */
- case 2: /* cos */
+ case UNSPEC_SIN:
+ case UNSPEC_COS:
+ case UNSPEC_FRNDINT:
+ case UNSPEC_F2XM1:
/* These insns only operate on the top of the stack. */
src1 = get_true_reg (&XVECEXP (pat_src, 0, 0));
replace_reg (src1, FIRST_STACK_REG);
break;
- case 10:
- /* (unspec [(unspec [(compare ..)] 9)] 10)
- Unspec 9 is fnstsw; unspec 10 is sahf. The combination
- matches the PPRO fcomi instruction. */
+ case UNSPEC_FPATAN:
+ case UNSPEC_FYL2X:
+ case UNSPEC_FSCALE:
+ /* These insns operate on the top two stack slots. */
+
+ src1 = get_true_reg (&XVECEXP (pat_src, 0, 0));
+ src2 = get_true_reg (&XVECEXP (pat_src, 0, 1));
+
+ src1_note = find_regno_note (insn, REG_DEAD, REGNO (*src1));
+ src2_note = find_regno_note (insn, REG_DEAD, REGNO (*src2));
+
+ {
+ struct stack_def temp_stack;
+ int regno, j, k, temp;
+
+ temp_stack = *regstack;
+
+ /* Place operand 1 at the top of stack. */
+ regno = get_hard_regnum (&temp_stack, *src1);
+ if (regno < 0)
+ abort ();
+ if (regno != FIRST_STACK_REG)
+ {
+ k = temp_stack.top - (regno - FIRST_STACK_REG);
+ j = temp_stack.top;
+
+ temp = temp_stack.reg[k];
+ temp_stack.reg[k] = temp_stack.reg[j];
+ temp_stack.reg[j] = temp;
+ }
+
+ /* Place operand 2 next on the stack. */
+ regno = get_hard_regnum (&temp_stack, *src2);
+ if (regno < 0)
+ abort ();
+ if (regno != FIRST_STACK_REG + 1)
+ {
+ k = temp_stack.top - (regno - FIRST_STACK_REG);
+ j = temp_stack.top - 1;
+
+ temp = temp_stack.reg[k];
+ temp_stack.reg[k] = temp_stack.reg[j];
+ temp_stack.reg[j] = temp;
+ }
+
+ change_stack (insn, regstack, &temp_stack, EMIT_BEFORE);
+ }
+
+ replace_reg (src1, FIRST_STACK_REG);
+ replace_reg (src2, FIRST_STACK_REG + 1);
+
+ if (src1_note)
+ replace_reg (&XEXP (src1_note, 0), FIRST_STACK_REG);
+ if (src2_note)
+ replace_reg (&XEXP (src2_note, 0), FIRST_STACK_REG + 1);
+
+ /* Pop both input operands from the stack. */
+ CLEAR_HARD_REG_BIT (regstack->reg_set,
+ regstack->reg[regstack->top]);
+ CLEAR_HARD_REG_BIT (regstack->reg_set,
+ regstack->reg[regstack->top - 1]);
+ regstack->top -= 2;
+
+ /* Push the result back onto the stack. */
+ regstack->reg[++regstack->top] = REGNO (*dest);
+ SET_HARD_REG_BIT (regstack->reg_set, REGNO (*dest));
+ replace_reg (dest, FIRST_STACK_REG);
+ break;
+
+ case UNSPEC_SAHF:
+ /* (unspec [(unspec [(compare)] UNSPEC_FNSTSW)] UNSPEC_SAHF)
+ The combination matches the PPRO fcomi instruction. */
pat_src = XVECEXP (pat_src, 0, 0);
if (GET_CODE (pat_src) != UNSPEC
- || XINT (pat_src, 1) != 9)
+ || XINT (pat_src, 1) != UNSPEC_FNSTSW)
abort ();
/* FALLTHRU */
- case 9:
- /* (unspec [(compare ..)] 9) */
+ case UNSPEC_FNSTSW:
/* Combined fcomp+fnstsw generated for doing well with
CSE. When optimizing this would have been broken
up before now. */
&& REGNO (*dest) != regstack->reg[regstack->top])
{
/* In case one of operands is the top of stack and the operands
- dies, it is safe to make it the destination operand by reversing
- the direction of cmove and avoid fxch. */
+ dies, it is safe to make it the destination operand by
+ reversing the direction of cmove and avoid fxch. */
if ((REGNO (*src1) == regstack->reg[regstack->top]
&& src1_note)
|| (REGNO (*src2) == regstack->reg[regstack->top]
static int
convert_regs_entry ()
{
- int inserted = 0, i;
+ int inserted = 0;
edge e;
+ basic_block block;
- for (i = n_basic_blocks - 1; i >= 0; --i)
+ FOR_EACH_BB_REVERSE (block)
{
- basic_block block = BASIC_BLOCK (i);
block_info bi = BLOCK_INFO (block);
int reg;
the push/pop code happy, and to not scrog the register stack, we
must put something in these registers. Use a QNaN.
- Note that we are insertting converted code here. This code is
+ Note that we are inserting converted code here. This code is
never seen by the convert_regs pass. */
for (e = ENTRY_BLOCK_PTR->succ; e ; e = e->succ_next)
output_stack->top = value_reg_high - value_reg_low;
for (reg = value_reg_low; reg <= value_reg_high; ++reg)
{
- output_stack->reg[reg - value_reg_low] = reg;
+ output_stack->reg[value_reg_high - reg] = reg;
SET_HARD_REG_BIT (output_stack->reg_set, reg);
}
}
abort ();
eh1:
+ /* We are sure that there is st(0) live, otherwise we won't compensate.
+ For complex return values, we may have st(1) live as well. */
SET_HARD_REG_BIT (tmp, FIRST_STACK_REG);
+ if (TEST_HARD_REG_BIT (regstack.reg_set, FIRST_STACK_REG + 1))
+ SET_HARD_REG_BIT (tmp, FIRST_STACK_REG + 1);
GO_IF_HARD_REG_EQUAL (regstack.reg_set, tmp, eh2);
abort ();
eh2:
current_block = NULL;
start_sequence ();
- /* ??? change_stack needs some point to emit insns after.
- Also needed to keep gen_sequence from returning a
- pattern as opposed to a sequence, which would lose
- REG_DEAD notes. */
- after = emit_note (NULL, NOTE_INSN_DELETED);
+ /* ??? change_stack needs some point to emit insns after. */
+ after = emit_note (NOTE_INSN_DELETED);
tmpstack = regstack;
change_stack (after, &tmpstack, target_stack, EMIT_BEFORE);
- seq = gen_sequence ();
+ seq = get_insns ();
end_sequence ();
insert_insn_on_edge (seq, e);
edge e, beste = NULL;
inserted = 0;
+ any_malformed_asm = false;
/* Find the edge we will copy stack from. It should be the most frequent
one as it will get cheapest after compensation code is generated,
}
}
- /* Something failed if the stack lives don't match. */
+ /* Something failed if the stack lives don't match. If we had malformed
+ asms, we zapped the instruction itself, but that didn't produce the
+ same pattern of register kills as before. */
GO_IF_HARD_REG_EQUAL (regstack.reg_set, bi->out_reg_set, win);
- abort ();
+ if (!any_malformed_asm)
+ abort ();
win:
bi->stack_out = regstack;
convert_regs (file)
FILE *file;
{
- int inserted, i;
+ int inserted;
+ basic_block b;
edge e;
/* Initialize uninitialized registers on function entry. */
/* ??? Process all unreachable blocks. Though there's no excuse
for keeping these even when not optimizing. */
- for (i = 0; i < n_basic_blocks; ++i)
+ FOR_EACH_BB (b)
{
- basic_block b = BASIC_BLOCK (i);
block_info bi = BLOCK_INFO (b);
if (! bi->done)
inserted |= convert_regs_2 (file, b);
}
}
+ clear_aux_for_blocks ();
fixup_abnormal_edges ();
if (inserted)
return inserted;
}
#endif /* STACK_REGS */
+
+#include "gt-reg-stack.h"
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