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Commit f964bd29 by Uros Bizjak Committed by Uros Bizjak
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reg-stack.c (swap_to_top): New function. 

2004-04-23  Uros Bizjak  <uros@kss-loka.si>

        * reg-stack.c (swap_to_top): New function.
        (subst_stack_regs_pat): UNSPEC_FPATAN, UNSPEC_FYL2X: Use\
        swap_to_top().
        (subst_stack_regs_pat): UNSPEC_FSCALE: Remove.
        (subst_stack_regs_pat): Handle UNSPEC_FSCALE_FRACT and
        UNSPEC_FSCALE_EXP.

        * config/i386/i386.md (UNSPEC_FSCALE): Remove.
        (*fscale_sfxf3, *fscale_dfxf3, *fscale_xf3): Remove insn pattern.
        (UNSPEC_FSCALE_FRACT, UNSPEC_FSCALE_EXP): New unspecs to represent
        x87's fscale insn.
        (*fscalexf4: Define new insn pattern to implement x87 fscale insn.
        (exp?f2, exp10?f2, exp2?f2): Use *fscalexf4 and float_truncate
        patterns.

From-SVN: r81278
parent fe666335
Showing with 125 additions and 37 deletions
gcc/ChangeLog
2004-04-29 Uros Bizjak <uros@kss-loka.si>
* reg-stack.c (swap_to_top): New function.
(subst_stack_regs_pat): UNSPEC_FPATAN, UNSPEC_FYL2X: Use
swap_to_top().
(subst_stack_regs_pat): UNSPEC_FSCALE: Remove.
(subst_stack_regs_pat): Handle UNSPEC_FSCALE_FRACT and
UNSPEC_FSCALE_EXP.
* config/i386/i386.md (UNSPEC_FSCALE): Remove.
(*fscale_sfxf3, *fscale_dfxf3, *fscale_xf3): Remove insn pattern.
(UNSPEC_FSCALE_FRACT, UNSPEC_FSCALE_EXP): New unspecs to represent
x87's fscale insn.
(*fscalexf4: Define new insn pattern to implement x87 fscale insn.
(exp?f2, exp10?f2, exp2?f2): Use *fscalexf4 and float_truncate
patterns.
2004-04-28 Serge Belyshev <1319@bot.ru>
PR 14944
......
gcc/reg-stack.c
......@@ -249,6 +249,7 @@ static void remove_regno_note (rtx, enum reg_note, unsigned int);
static int get_hard_regnum (stack, rtx);
static rtx emit_pop_insn (rtx, stack, rtx, enum emit_where);
static void emit_swap_insn (rtx, stack, rtx);
static void swap_to_top(rtx, stack, rtx, rtx);
static bool move_for_stack_reg (rtx, stack, rtx);
static int swap_rtx_condition_1 (rtx);
static int swap_rtx_condition (rtx);
......@@ -1034,6 +1035,54 @@ emit_swap_insn (rtx insn, stack regstack, rtx reg)
emit_insn_before (swap_rtx, insn);
}
/* Emit an insns before INSN to swap virtual register SRC1 with
the top of stack and virtual register SRC2 with second stack
slot. REGSTACK is the stack state before the swaps, and
is updated to reflect the swaps. A swap insn is represented as a
PARALLEL of two patterns: each pattern moves one reg to the other.
If SRC1 and/or SRC2 are already at the right place, no swap insn
is emitted. */
static void
swap_to_top (rtx insn, stack regstack, rtx src1, rtx 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);
}
/* Handle a move to or from a stack register in PAT, which is in INSN.
REGSTACK is the current stack. Return whether a control flow insn
was deleted in the process. */
......@@ -1701,7 +1750,6 @@ subst_stack_regs_pat (rtx insn, stack regstack, rtx pat)
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));
......@@ -1710,42 +1758,7 @@ subst_stack_regs_pat (rtx insn, stack regstack, rtx pat)
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);
}
swap_to_top (insn, regstack, *src1, *src2);
replace_reg (src1, FIRST_STACK_REG);
replace_reg (src2, FIRST_STACK_REG + 1);
......@@ -1768,6 +1781,64 @@ subst_stack_regs_pat (rtx insn, stack regstack, rtx pat)
replace_reg (dest, FIRST_STACK_REG);
break;
case UNSPEC_FSCALE_FRACT:
/* These insns operate on the top two stack slots.
first part of double input, double output insn. */
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));
/* Inputs should never die, they are
replaced with outputs. */
if ((src1_note) || (src2_note))
abort();
swap_to_top (insn, regstack, *src1, *src2);
/* Push the result back onto stack. Empty stack slot
will be filled in second part of insn. */
if (STACK_REG_P (*dest)) {
regstack->reg[regstack->top] = REGNO (*dest);
SET_HARD_REG_BIT (regstack->reg_set, REGNO (*dest));
replace_reg (dest, FIRST_STACK_REG);
}
replace_reg (src1, FIRST_STACK_REG);
replace_reg (src2, FIRST_STACK_REG + 1);
break;
case UNSPEC_FSCALE_EXP:
/* These insns operate on the top two stack slots./
second part of double input, double output insn. */
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));
/* Inputs should never die, they are
replaced with outputs. */
if ((src1_note) || (src2_note))
abort();
swap_to_top (insn, regstack, *src1, *src2);
/* Push the result back onto stack. Fill empty slot from
first part of insn and fix top of stack pointer. */
if (STACK_REG_P (*dest)) {
regstack->reg[regstack->top - 1] = REGNO (*dest);
SET_HARD_REG_BIT (regstack->reg_set, REGNO (*dest));
replace_reg (dest, FIRST_STACK_REG + 1);
}
replace_reg (src1, FIRST_STACK_REG);
replace_reg (src2, FIRST_STACK_REG + 1);
break;
case UNSPEC_SINCOS_COS:
case UNSPEC_TAN_ONE:
case UNSPEC_XTRACT_FRACT:
......
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