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| author | Jeffrey A Law <law@cygnus.com> | 1997-10-27 23:07:37 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1997-10-27 16:07:37 -0700 |
| commit | 0cecc1904d81554d7e955ed43709f9c6aff91b20 (patch) | |
| tree | b616fe416f6fe8aa95e5d9d1ea195bf437efad28 /gcc | |
| parent | c9670e62b999b5175c774224e0db88655103ff6c (diff) | |
| download | gcc-0cecc1904d81554d7e955ed43709f9c6aff91b20.zip gcc-0cecc1904d81554d7e955ed43709f9c6aff91b20.tar.gz gcc-0cecc1904d81554d7e955ed43709f9c6aff91b20.tar.bz2 | |
* mn10300.h (GO_IF_LEGITIMATE_ADDRESS): Disable reg+reg.
From-SVN: r16209
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/config/mn10300/mn10300.h | 17 |
2 files changed, 16 insertions, 5 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 063f3d8..fd6a576 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +Mon Oct 27 16:11:10 1997 Jeffrey A Law (law@cygnus.com) + + * mn10300.h (GO_IF_LEGITIMATE_ADDRESS): Disable reg+reg. + Sun Oct 26 13:50:44 1997 Richard Henderson <rth@cygnus.com> * alpha.c (alpha_sa_mask [VMS]): Don't include $26 in the mask. diff --git a/gcc/config/mn10300/mn10300.h b/gcc/config/mn10300/mn10300.h index 4c32b8d..252a70f 100644 --- a/gcc/config/mn10300/mn10300.h +++ b/gcc/config/mn10300/mn10300.h @@ -639,7 +639,18 @@ extern struct rtx_def *mn10300_builtin_saveregs (); The other macros defined here are used only in GO_IF_LEGITIMATE_ADDRESS, except for CONSTANT_ADDRESS_P which is actually - machine-independent. */ + machine-independent. + + On the mn10300, the value in the address register must be + in the same memory space/segment as the effective address. + + This is problematical for reload since it does not understand + that base+index != index+base in a memory reference. + + Note it is still possible to use reg+reg addressing modes, + it's just much more difficult. For a discussion of a possible + workaround and solution, see the comments in pa.c before the + function record_unscaled_index_insn_codes. */ /* Accept either REG or SUBREG where a register is valid. */ @@ -667,10 +678,6 @@ extern struct rtx_def *mn10300_builtin_saveregs (); { \ if (GET_CODE (index) == CONST_INT) \ goto ADDR; \ - if (REG_P (index) \ - && REG_OK_FOR_INDEX_P (index) \ - && GET_MODE_SIZE (mode) <= GET_MODE_SIZE (word_mode)) \ - goto ADDR; \ } \ } \ } |