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| author | Jim Wilson <wilson@gcc.gnu.org> | 1996-09-05 11:59:21 -0700 |
|---|---|---|
| committer | Jim Wilson <wilson@gcc.gnu.org> | 1996-09-05 11:59:21 -0700 |
| commit | a73a51149a13be2d62e21ee6e84fec32f7b7c61a (patch) | |
| tree | 183dfb179026daa975d8c2ad150561e20b5b6324 /gcc/config/sh | |
| parent | 7a8940aaa951bd56c0bbd490ba4d152b34de6e65 (diff) | |
| download | gcc-a73a51149a13be2d62e21ee6e84fec32f7b7c61a.zip gcc-a73a51149a13be2d62e21ee6e84fec32f7b7c61a.tar.gz gcc-a73a51149a13be2d62e21ee6e84fec32f7b7c61a.tar.bz2 | |
(LEGITIMIZE_ADDRESS): Define nonempty.
From-SVN: r12691
Diffstat (limited to 'gcc/config/sh')
| -rw-r--r-- | gcc/config/sh/sh.h | 47 |
1 files changed, 45 insertions, 2 deletions
diff --git a/gcc/config/sh/sh.h b/gcc/config/sh/sh.h index 4735308..8d22454 100644 --- a/gcc/config/sh/sh.h +++ b/gcc/config/sh/sh.h @@ -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. */ |