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| author | Richard Kenner <kenner@gcc.gnu.org> | 1996-10-23 10:48:36 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1996-10-23 10:48:36 -0400 |
| commit | ecd4080946e1ac6014123a65161c96c48e13ef21 (patch) | |
| tree | 8a1039617bee5ff9e3fa9a985c63e4d59e3a22a7 /gcc | |
| parent | 02214a5c1475a8fd2ed983889eab632f31708704 (diff) | |
| download | gcc-ecd4080946e1ac6014123a65161c96c48e13ef21.zip gcc-ecd4080946e1ac6014123a65161c96c48e13ef21.tar.gz gcc-ecd4080946e1ac6014123a65161c96c48e13ef21.tar.bz2 | |
(can_combine_p): When SMALL_REGISTER_CLASSES is defined, avoid
substituting a return register into I3.
From-SVN: r13006
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/combine.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 5f07a35..745427a 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -960,11 +960,16 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc) /* Don't extend the life of a hard register unless it is user variable (if we have few registers) or it can't fit into the desired register (meaning something special - is going on). */ + is going on). + Also avoid substituting a return register into I3, because + reload can't handle a conflict with constraints of other + inputs. */ || (REGNO (src) < FIRST_PSEUDO_REGISTER && (! HARD_REGNO_MODE_OK (REGNO (src), GET_MODE (src)) #ifdef SMALL_REGISTER_CLASSES || (! all_adjacent && ! REG_USERVAR_P (src)) + || (FUNCTION_VALUE_REGNO_P (REGNO (src)) + && ! REG_USERVAR_P (src)) #endif )))) return 0; |