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(output_addsi3): New function. From addsi3 pattern.

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From-SVN: r13952
This commit is contained in:
Jim Wilson 1997-04-21 10:57:09 -07:00
parent 079e639f76
commit 9ee3c68737
1 changed files with 91 additions and 0 deletions
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91
gcc/config/m68k/m68k.c
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@ -1951,6 +1951,97 @@ find_addr_reg (addr)
return addr;
abort ();
}
/* Output assembler code to perform a 32 bit 3 operand add. */
char *
output_addsi3 (operands)
rtx *operands;
{
if (! operands_match_p (operands[0], operands[1]))
{
if (!ADDRESS_REG_P (operands[1]))
{
rtx tmp = operands[1];
operands[1] = operands[2];
operands[2] = tmp;
}
/* These insns can result from reloads to access
stack slots over 64k from the frame pointer. */
if (GET_CODE (operands[2]) == CONST_INT
&& INTVAL (operands[2]) + 0x8000 >= (unsigned) 0x10000)
return "move%.l %2,%0\\;add%.l %1,%0";
#ifdef SGS
if (GET_CODE (operands[2]) == REG)
return "lea 0(%1,%2.l),%0";
else
return "lea %c2(%1),%0";
#else /* not SGS */
#ifdef MOTOROLA
if (GET_CODE (operands[2]) == REG)
return "lea (%1,%2.l),%0";
else
return "lea (%c2,%1),%0";
#else /* not MOTOROLA (MIT syntax) */
if (GET_CODE (operands[2]) == REG)
return "lea %1@(0,%2:l),%0";
else
return "lea %1@(%c2),%0";
#endif /* not MOTOROLA */
#endif /* not SGS */
}
if (GET_CODE (operands[2]) == CONST_INT)
{
#ifndef NO_ADDSUB_Q
if (INTVAL (operands[2]) > 0
&& INTVAL (operands[2]) <= 8)
return "addq%.l %2,%0";
if (INTVAL (operands[2]) < 0
&& INTVAL (operands[2]) >= -8)
{
operands[2] = gen_rtx (CONST_INT, VOIDmode,
- INTVAL (operands[2]));
return "subq%.l %2,%0";
}
/* On the CPU32 it is faster to use two addql instructions to
add a small integer (8 < N <= 16) to a register.
Likewise for subql. */
if (TARGET_CPU32 && REG_P (operands[0]))
{
if (INTVAL (operands[2]) > 8
&& INTVAL (operands[2]) <= 16)
{
operands[2] = gen_rtx (CONST_INT, VOIDmode,
INTVAL (operands[2]) - 8);
return "addq%.l %#8,%0\\;addq%.l %2,%0";
}
if (INTVAL (operands[2]) < -8
&& INTVAL (operands[2]) >= -16)
{
operands[2] = gen_rtx (CONST_INT, VOIDmode,
- INTVAL (operands[2]) - 8);
return "subq%.l %#8,%0\\;subq%.l %2,%0";
}
}
#endif
if (ADDRESS_REG_P (operands[0])
&& INTVAL (operands[2]) >= -0x8000
&& INTVAL (operands[2]) < 0x8000)
{
if (TARGET_68040)
return "add%.w %2,%0";
else
#ifdef MOTOROLA
return "lea (%c2,%0),%0";
#else
return "lea %0@(%c2),%0";
#endif
}
}
return "add%.l %2,%0";
}
/* Store in cc_status the expressions that the condition codes will
describe after execution of an instruction whose pattern is EXP.