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(output_function_{pro,epi}logue): Use addq/subq when adjusting stack

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pointer by small displacements.

From-SVN: r13366
This commit is contained in:
Richard Kenner 1997-01-04 08:12:13 -05:00
parent fe1590618e
commit 7bc88d4933
1 changed files with 84 additions and 12 deletions
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96
gcc/config/m68k/m68k.c
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@ -1,5 +1,5 @@
/* Subroutines for insn-output.c for Motorola 68000 family.
Copyright (C) 1987, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
Copyright (C) 1987, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
This file is part of GNU CC.
@ -211,24 +211,61 @@ output_function_prologue (stream, size)
}
else if (fsize)
{
/* Adding negative number is faster on the 68040. */
if (fsize + 4 < 0x8000)
{
if (!TARGET_68040)
#ifdef NO_ADDSUB_Q
if (fsize + 4 <= 8)
{
if (!TARGET_5200)
{
/* asm_fprintf() cannot handle %. */
#ifdef MOTOROLA
asm_fprintf (stream, "\tlea (%d,%Rsp),%Rsp\n", - (fsize + 4));
asm_fprintf (stream, "\tsubq.w %OI%d,%Rsp\n", fsize + 4);
#else
asm_fprintf (stream, "\tlea %Rsp@(%d),%Rsp\n", - (fsize + 4));
asm_fprintf (stream, "\tsubqw %OI%d,%Rsp\n", fsize + 4);
#endif
}
else
{
#ifdef MOTOROLA
asm_fprintf (stream, "\tsubq.l %OI%d,%Rsp\n", fsize + 4);
#else
asm_fprintf (stream, "\tsubql %OI%d,%Rsp\n", fsize + 4);
#endif
}
}
else if (fsize + 4 <= 16 && TARGET_CPU32)
{
/* On the CPU32 it is faster to use two subqw instructions to
subtract a small integer (8 < N <= 16) to a register. */
/* asm_fprintf() cannot handle %. */
#ifdef MOTOROLA
asm_fprintf (stream, "\tsubq.w %OI8,%Rsp\n\tsubq.w %OI%d,%Rsp\n",
fsize + 4);
#else
asm_fprintf (stream, "\tsubqw %OI8,%Rsp\n\tsubqw %OI%d,%Rsp\n",
fsize + 4);
#endif
}
else
#endif /* NO_ADDSUB_Q */
if (TARGET_68040)
{
/* Adding negative number is faster on the 68040. */
/* asm_fprintf() cannot handle %. */
#ifdef MOTOROLA
asm_fprintf (stream, "\tadd.w %0I%d,%Rsp\n", - (fsize + 4));
#else
asm_fprintf (stream, "\taddw %0I%d,%Rsp\n", - (fsize + 4));
#endif
}
else
{
/* asm_fprintf() cannot handle %. */
#ifdef MOTOROLA
asm_fprintf (stream, "\tadd.w %0I%d,%Rsp\n", - (fsize + 4));
asm_fprintf (stream, "\tlea (%d,%Rsp),%Rsp\n", - (fsize + 4));
#else
asm_fprintf (stream, "\taddw %0I%d,%Rsp\n", - (fsize + 4));
asm_fprintf (stream, "\tlea %Rsp@(%d),%Rsp\n", - (fsize + 4));
#endif
}
}
@ -640,23 +677,58 @@ output_function_epilogue (stream, size)
reg_names[FRAME_POINTER_REGNUM]);
else if (fsize)
{
#ifdef NO_ADDSUB_Q
if (fsize + 4 <= 8)
{
if (!TARGET_5200)
{
#ifdef MOTOROLA
asm_fprintf (stream, "\taddq.w %OI%d,%Rsp\n", fsize + 4);
#else
asm_fprintf (stream, "\taddqw %OI%d,%Rsp\n", fsize + 4);
#endif
}
else
{
#ifdef MOTOROLA
asm_fprintf (stream, "\taddq.l %OI%d,%Rsp\n", fsize + 4);
#else
asm_fprintf (stream, "\taddql %OI%d,%Rsp\n", fsize + 4);
#endif
}
}
else if (fsize + 4 <= 16 && TARGET_CPU32)
{
/* On the CPU32 it is faster to use two addqw instructions to
add a small integer (8 < N <= 16) to a register. */
#ifdef MOTOROLA
asm_fprintf (stream, "\taddq.w %OI8,%Rsp\n\taddq.w %OI%d,%Rsp\n",
fsize + 4);
#else
asm_fprintf (stream, "\taddqw %OI8,%Rsp\n\taddqw %OI%d,%Rsp\n",
fsize + 4);
#endif
}
else
#endif /* NO_ADDSUB_Q */
if (fsize + 4 < 0x8000)
{
if (!TARGET_68040)
if (TARGET_68040)
{
/* asm_fprintf() cannot handle %. */
#ifdef MOTOROLA
asm_fprintf (stream, "\tlea (%d,%Rsp),%Rsp\n", fsize + 4);
asm_fprintf (stream, "\tadd.w %0I%d,%Rsp\n", fsize + 4);
#else
asm_fprintf (stream, "\tlea %Rsp@(%d),%Rsp\n", fsize + 4);
asm_fprintf (stream, "\taddw %0I%d,%Rsp\n", fsize + 4);
#endif
}
else
{
/* asm_fprintf() cannot handle %. */
#ifdef MOTOROLA
asm_fprintf (stream, "\tadd.w %0I%d,%Rsp\n", fsize + 4);
asm_fprintf (stream, "\tlea (%d,%Rsp),%Rsp\n", fsize + 4);
#else
asm_fprintf (stream, "\taddw %0I%d,%Rsp\n", fsize + 4);
asm_fprintf (stream, "\tlea %Rsp@(%d),%Rsp\n", fsize + 4);
#endif
}
}