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Patch: mips.h GO_IF_LEGITIMATE_ADDRESS large constant handling
- To: egcs-patches at egcs dot cygnus dot com
- Subject: Patch: mips.h GO_IF_LEGITIMATE_ADDRESS large constant handling
- From: Stan Cox <scox at cygnus dot com>
- Date: 22 Sep 1999 16:18:15 +0000
Load too large constants into a register instead of allowing them as
an offset to a base register which is later rejected by the add
pattern.
e.g.
struct sss {char xxx[4][0x1000*2];int yyy[10];};
mmm(p, chan)
register struct sss *p;
int chan;
{return p->yyy[chan];}
This has been approved and bootstrapped on irix.
* mips.h (GO_IF_LEGITIMATE_ADDRESS): Don't accept large
register offsets; let LEGITIMIZE_ADDRESS load it into a register.
(LEGITIMIZE_ADDRESS): Use plus_constant to avoid
(plus (reg) (const_int 0))
Index: config/mips/mips.h
===================================================================
RCS file: /egcs/carton/cvsfiles/egcs/gcc/config/mips/mips.h,v
retrieving revision 1.65
diff -c -2 -p -r1.65 mips.h
*** mips.h 1999/09/14 23:29:31 1.65
--- mips.h 1999/09/22 15:58:06
*************** extern struct rtx_def *mips_va_arg ();
*** 2967,2970 ****
--- 2967,2971 ----
|| code1 != CONST \
|| GET_CODE (XEXP (xplus1, 0)) != MINUS) \
+ && ! (code1 == CONST_INT && ! SMALL_INT (xplus1)) \
&& !TARGET_MIPS16) \
goto ADDR; \
*************** extern struct rtx_def *mips_va_arg ();
*** 3126,3131 ****
gen_rtx_PLUS (Pmode, xplus0, int_reg))); \
\
! X = gen_rtx_PLUS (Pmode, ptr_reg, \
! GEN_INT (INTVAL (xplus1) & 0x7fff)); \
goto WIN; \
} \
--- 3127,3131 ----
gen_rtx_PLUS (Pmode, xplus0, int_reg))); \
\
! X = plus_constant (ptr_reg, INTVAL (xplus1) & 0x7fff); \
goto WIN; \
} \