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| author | Richard Henderson <rth@cygnus.com> | 1998-04-01 17:56:17 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 1998-04-01 17:56:17 -0800 |
| commit | ce4d78eb2f91ec1b5278a4a23467055089ccc22f (patch) | |
| tree | 922ce3c162ba7fe51d2e1c2fb79adbdb13372e37 | |
| parent | 4901a643933d7005c4745beec0fee58552412b2b (diff) | |
| download | gcc-ce4d78eb2f91ec1b5278a4a23467055089ccc22f.zip gcc-ce4d78eb2f91ec1b5278a4a23467055089ccc22f.tar.gz gcc-ce4d78eb2f91ec1b5278a4a23467055089ccc22f.tar.bz2 | |
final.c (alter_subreg): Allow the target to hook by-mode subreg hard register number changes.
* final.c (alter_subreg): Allow the target to hook by-mode subreg
hard register number changes.
From-SVN: r18946
| -rw-r--r-- | gcc/ChangeLog | 2 | ||||
| -rw-r--r-- | gcc/final.c | 13 | ||||
| -rw-r--r-- | gcc/tm.texi | 11 |
3 files changed, 25 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 9eea255..578b9b7 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -5,6 +5,8 @@ Thu Apr 2 01:01:34 1998 Richard Henderson <rth@cygnus.com> * emit-rtl.c (gen_lowpart_common): Skip count by HARD_REGNO_NREGS. (gen_highpart): Likewise. + * final.c (alter_subreg): Allow the target to hook by-mode subreg + hard register number changes. Wed Apr 1 22:26:22 1998 Jeffrey A Law (law@cygnus.com) diff --git a/gcc/final.c b/gcc/final.c index 74a6d15..6b851f2 100644 --- a/gcc/final.c +++ b/gcc/final.c @@ -2891,9 +2891,20 @@ alter_subreg (x) if (GET_CODE (y) == REG) { - /* If the containing reg really gets a hard reg, so do we. */ + /* If the word size is larger than the size of this register, + adjust the register number to compensate. */ + /* ??? Note that this just catches stragglers created by/for + integrate. It would be better if we either caught these + earlier, or kept _all_ subregs until now and eliminate + gen_lowpart and friends. */ + PUT_CODE (x, REG); +#ifdef ALTER_HARD_SUBREG + REGNO (x) = ALTER_HARD_SUBREG(GET_MODE (x), SUBREG_WORD (x), + GET_MODE (y), REGNO (y)); +#else REGNO (x) = REGNO (y) + SUBREG_WORD (x); +#endif } else if (GET_CODE (y) == MEM) { diff --git a/gcc/tm.texi b/gcc/tm.texi index d8fb724..ad57838 100644 --- a/gcc/tm.texi +++ b/gcc/tm.texi @@ -1403,6 +1403,17 @@ definition of this macro is / UNITS_PER_WORD)) @end smallexample +@findex ALTER_HARD_SUBREG +@item ALTER_HARD_SUBREG (@var{tgt_mode}, @var{word}, @var{src_mode}, @var{regno}) +A C expression that returns an adjusted hard register number for + +@smallexample +(subreg:@var{tgt_mode} (reg:@var{src_mode} @var{regno}) @var{word}) +@end smallexample + +This may be needed if the target machine has mixed sized big-endian +registers, like Sparc v9. + @findex HARD_REGNO_MODE_OK @item HARD_REGNO_MODE_OK (@var{regno}, @var{mode}) A C expression that is nonzero if it is permissible to store a value |