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i386.c (output_move_double): Abort if a non-offsettable memory operand is encountered.

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* i386.c (output_move_double): Abort if a non-offsettable
	memory operand is encountered.  Delete unused code.
	(find_addr_reg): Remove.

From-SVN: r26561
This commit is contained in:
John Wehle 1999-04-20 10:18:33 +00:00 • committed by John Wehle
parent 01f78a025e
commit 296967fe64
2 changed files with 18 additions and 87 deletions
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6
gcc/ChangeLog
View file

@ -1,3 +1,9 @@
Tue Apr 20 13:14:58 EDT 1999 John Wehle (john@feith.com)
* i386.c (output_move_double): Abort if a non-offsettable
memory operand is encountered. Delete unused code.
(find_addr_reg): Remove.
Mon Apr 19 21:13:02 1999 Craig Burley <craig@jcb-sc.com>
* tree.def (BLOCK): Fix typo in comment.

99
gcc/config/i386/i386.c
View file

@ -992,32 +992,6 @@ singlemove_string (operands)
}
}
/* Return a REG that occurs in ADDR with coefficient 1.
ADDR can be effectively incremented by incrementing REG. */
static rtx
find_addr_reg (addr)
rtx addr;
{
while (GET_CODE (addr) == PLUS)
{
if (GET_CODE (XEXP (addr, 0)) == REG)
addr = XEXP (addr, 0);
else if (GET_CODE (XEXP (addr, 1)) == REG)
addr = XEXP (addr, 1);
else if (CONSTANT_P (XEXP (addr, 0)))
addr = XEXP (addr, 1);
else if (CONSTANT_P (XEXP (addr, 1)))
addr = XEXP (addr, 0);
else
abort ();
}
if (GET_CODE (addr) == REG)
return addr;
abort ();
}
/* Output an insn to add the constant N to the register X. */
static void
@ -1055,7 +1029,6 @@ output_move_double (operands)
rtx latehalf[2];
rtx middlehalf[2];
rtx xops[2];
rtx addreg0 = 0, addreg1 = 0;
int dest_overlapped_low = 0;
int size = GET_MODE_SIZE (GET_MODE (operands[0]));
@ -1092,11 +1065,14 @@ output_move_double (operands)
else
optype1 = RNDOP;
/* Check for the cases that the operand constraints are not
supposed to allow to happen. Abort if we get one,
because generating code for these cases is painful. */
/* Check for the cases that are not supposed to happen
either due to the operand constraints or the fact
that all memory operands on the x86 are offsettable.
Abort if we get one, because generating code for these
cases is painful. */
if (optype0 == RNDOP || optype1 == RNDOP)
if (optype0 == RNDOP || optype1 == RNDOP
|| optype0 == MEMOP || optype1 == MEMOP)
abort ();
/* If one operand is decrementing and one is incrementing
@ -1131,15 +1107,6 @@ output_move_double (operands)
optype1 = OFFSOP;
}
/* If an operand is an unoffsettable memory ref, find a register
we can increment temporarily to make it refer to the second word. */
if (optype0 == MEMOP)
addreg0 = find_addr_reg (XEXP (operands[0], 0));
if (optype1 == MEMOP)
addreg1 = find_addr_reg (XEXP (operands[1], 0));
/* Ok, we can do one word at a time.
Normally we do the low-numbered word first,
but if either operand is autodecrementing then we
@ -1236,8 +1203,7 @@ output_move_double (operands)
emit the move late-half first. Otherwise, compute the MEM address
into the upper part of N and use that as a pointer to the memory
operand. */
if (optype0 == REGOP
&& (optype1 == OFFSOP || optype1 == MEMOP))
if (optype0 == REGOP && optype1 == OFFSOP)
{
if (reg_mentioned_p (operands[0], XEXP (operands[1], 0))
&& reg_mentioned_p (latehalf[0], XEXP (operands[1], 0)))
@ -1269,10 +1235,6 @@ output_move_double (operands)
|| reg_mentioned_p (latehalf[0], XEXP (operands[1], 0)))
goto compadr;
/* JRV says this can't happen: */
if (addreg0 || addreg1)
abort ();
/* Only the middle reg conflicts; simply put it last. */
output_asm_insn (singlemove_string (operands), operands);
output_asm_insn (singlemove_string (latehalf), latehalf);
@ -1307,29 +1269,11 @@ output_move_double (operands)
|| REGNO (operands[0]) == REGNO (latehalf[1])))
|| dest_overlapped_low)
{
/* Make any unoffsettable addresses point at high-numbered word. */
if (addreg0)
asm_add (size-4, addreg0);
if (addreg1)
asm_add (size-4, addreg1);
/* Do that word. */
/* Do the high-numbered word. */
output_asm_insn (singlemove_string (latehalf), latehalf);
/* Undo the adds we just did. */
if (addreg0)
asm_add (-4, addreg0);
if (addreg1)
asm_add (-4, addreg1);
if (size == 12)
{
output_asm_insn (singlemove_string (middlehalf), middlehalf);
if (addreg0)
asm_add (-4, addreg0);
if (addreg1)
asm_add (-4, addreg1);
}
output_asm_insn (singlemove_string (middlehalf), middlehalf);
/* Do low-numbered word. */
return singlemove_string (operands);
@ -1341,30 +1285,11 @@ output_move_double (operands)
/* Do the middle one of the three words for long double */
if (size == 12)
{
if (addreg0)
asm_add (4, addreg0);
if (addreg1)
asm_add (4, addreg1);
output_asm_insn (singlemove_string (middlehalf), middlehalf);
output_asm_insn (singlemove_string (middlehalf), middlehalf);
}
/* Make any unoffsettable addresses point at high-numbered word. */
if (addreg0)
asm_add (4, addreg0);
if (addreg1)
asm_add (4, addreg1);
/* Do that word. */
/* Do the high-numbered word. */
output_asm_insn (singlemove_string (latehalf), latehalf);
/* Undo the adds we just did. */
if (addreg0)
asm_add (4-size, addreg0);
if (addreg1)
asm_add (4-size, addreg1);
return "";
}