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expr.c (expand_assignment): Rework address calculation for structure field members to expose more invariant...

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* expr.c (expand_assignment): Rework address calculation for structure
        field members to expose more invariant computations to the loop
        optimizer.
        (expand_expr): Likewise.

From-SVN: r20705
This commit is contained in:
Herman A.J. ten Brugge 1998-06-25 00:40:29 +02:00 committed by Jeff Law
parent c358412fe8
commit 8975220280
2 changed files with 48 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
1998-06-22 Herman A.J. ten Brugge <Haj.Ten.Brugge@net.HCC.nl>
* expr.c (expand_assignment): Rework address calculation for structure
field members to expose more invariant computations to the loop
optimizer.
(expand_expr): Likewise.
Wed Jun 24 22:44:22 1998 Jeffrey A Law (law@cygnus.com)
* local-alloc.c (block_alloc): Do not try to avoid false dependencies

41
gcc/expr.c
View File

@ -2920,6 +2920,26 @@ expand_assignment (to, from, want_value, suggest_reg)
#endif
}
if (GET_CODE (to_rtx) == MEM
&& GET_MODE (to_rtx) == BLKmode
&& bitsize
&& (bitpos % bitsize) == 0
&& (bitsize % GET_MODE_ALIGNMENT (mode1)) == 0
&& (alignment * BITS_PER_UNIT) == GET_MODE_ALIGNMENT (mode1))
{
rtx temp = change_address (to_rtx, mode1,
plus_constant (XEXP (to_rtx, 0),
(bitpos /
BITS_PER_UNIT)));
if (GET_CODE (XEXP (temp, 0)) == REG)
to_rtx = temp;
else
to_rtx = change_address (to_rtx, mode1,
force_reg (GET_MODE (XEXP (temp, 0)),
XEXP (temp, 0)));
bitpos = 0;
}
to_rtx = change_address (to_rtx, VOIDmode,
gen_rtx_PLUS (ptr_mode, XEXP (to_rtx, 0),
force_reg (ptr_mode, offset_rtx)));
@ -5918,6 +5938,27 @@ expand_expr (exp, target, tmode, modifier)
#endif
}
if (GET_CODE (op0) == MEM
&& GET_MODE (op0) == BLKmode
&& bitsize
&& (bitpos % bitsize) == 0
&& (bitsize % GET_MODE_ALIGNMENT (mode1)) == 0
&& (alignment * BITS_PER_UNIT) == GET_MODE_ALIGNMENT (mode1))
{
rtx temp = change_address (op0, mode1,
plus_constant (XEXP (op0, 0),
(bitpos /
BITS_PER_UNIT)));
if (GET_CODE (XEXP (temp, 0)) == REG)
op0 = temp;
else
op0 = change_address (op0, mode1,
force_reg (GET_MODE (XEXP (temp, 0)),
XEXP (temp, 0)));
bitpos = 0;
}
op0 = change_address (op0, VOIDmode,
gen_rtx_PLUS (ptr_mode, XEXP (op0, 0),
force_reg (ptr_mode, offset_rtx)));