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(LEGITIMIZE_ADDRESS): Define nonempty. 

From-SVN: r12691
This commit is contained in:
Jim Wilson 1996-09-05 11:59:21 -07:00
parent 7a8940aaa9
commit a73a51149a
1 changed files with 45 additions and 2 deletions
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47
gcc/config/sh/sh.h
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@ -1059,9 +1059,52 @@ extern struct rtx_def *sh_builtin_saveregs ();
GO_IF_LEGITIMATE_ADDRESS.
It is always safe for this macro to do nothing. It exists to recognize
opportunities to optimize the output. */
opportunities to optimize the output.
#define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN) ;
For the SH, if X is almost suitable for indexing, but the offset is
out of range, convert it into a normal form so that cse has a chance
of reducing the number of address registers used. */
#define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN) \
{ \
if (GET_CODE (x) == PLUS \
&& (GET_MODE_SIZE (MODE) == 4 \
|| GET_MODE_SIZE (MODE) == 8) \
&& GET_CODE (XEXP (X, 1)) == CONST_INT \
&& BASE_REGISTER_RTX_P (XEXP (X, 0)) \
&& ! (TARGET_SH3E && MODE == SFmode)) \
{ \
rtx index_rtx = XEXP (X, 1); \
HOST_WIDE_INT offset = INTVAL (index_rtx), offset_base; \
rtx sum; \
\
GO_IF_LEGITIMATE_INDEX (MODE, index_rtx, WIN); \
/* On rare occaisons, we might get an unaligned pointer \
that is indexed in a way to give an aligned address. \
Therefore, keep the lower two bits in offset_base. */ \
/* Instead of offset_base 128..131 use 124..127, so that \
simple add suffices. */ \
if (offset > 127) \
{ \
offset_base = ((offset + 4) & ~60) - 4; \
} \
else \
offset_base = offset & ~60; \
/* Sometimes the normal form does not suit DImode. We \
could avoid that by using smaller ranges, but that \
would give less optimized code when SImode is
prevalent. */ \
if (GET_MODE_SIZE (MODE) + offset - offset_base <= 64) \
{ \
sum = expand_binop (Pmode, add_optab, XEXP (x, 0), \
GEN_INT (offset_base), NULL_RTX, 0, \
OPTAB_LIB_WIDEN); \
\
(X) = gen_rtx (PLUS, Pmode, sum, GEN_INT (offset - offset_base)); \
goto WIN; \
} \
} \
}
/* Go to LABEL if ADDR (a legitimate address expression)
has an effect that depends on the machine mode it is used for. */