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| author | Torbjorn Granlund <tege@gnu.org> | 1995-02-06 02:42:29 +0000 |
|---|---|---|
| committer | Torbjorn Granlund <tege@gnu.org> | 1995-02-06 02:42:29 +0000 |
| commit | 3296aff4d653227566c2757edad27018940d6ea9 (patch) | |
| tree | 9471be8710da9d7359a9854f2e9d664ddbc3addb | |
| parent | 71af73bb7f9d65a10c37ab6368e880b3b1774889 (diff) | |
| download | gcc-3296aff4d653227566c2757edad27018940d6ea9.zip gcc-3296aff4d653227566c2757edad27018940d6ea9.tar.gz gcc-3296aff4d653227566c2757edad27018940d6ea9.tar.bz2 | |
(RTX_COSTS): Add special cases for a plain 68000.
From-SVN: r8869
| -rw-r--r-- | gcc/config/m68k/m68k.h | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/gcc/config/m68k/m68k.h b/gcc/config/m68k/m68k.h index b68aa60..d7d45d1 100644 --- a/gcc/config/m68k/m68k.h +++ b/gcc/config/m68k/m68k.h @@ -1371,8 +1371,10 @@ __transfer_from_trampoline () \ work properly in synth_mult on the 68020, relative to an average of the time for add and the time for shift, taking away a little more because sometimes move insns are needed. */ +/* div?.w is relatively cheaper on 68000 counted in COSTS_N_INSNS terms. */ #define MULL_COST (TARGET_68040 ? 5 : 13) -#define MULW_COST (TARGET_68040 ? 3 : 8) +#define MULW_COST (TARGET_68040 ? 3 : TARGET_68020 ? 8 : 5) +#define DIVW_COST (TARGET_68020 ? 27 : 12) #define RTX_COSTS(X,CODE,OUTER_CODE) \ case PLUS: \ @@ -1389,7 +1391,19 @@ __transfer_from_trampoline () \ break; \ case ASHIFT: \ case ASHIFTRT: \ - case LSHIFTRT: \ + case LSHIFTRT: \ + if (! TARGET_68020) \ + { \ + if (GET_CODE (XEXP (X, 1)) == CONST_INT) \ + { \ + if (INTVAL (XEXP (X, 1)) < 16) \ + return COSTS_N_INSNS (2) + INTVAL (XEXP (X, 1)) / 2; \ + else \ + /* We're using clrw + swap for these cases. */ \ + return COSTS_N_INSNS (4) + (INTVAL (XEXP (X, 1)) - 16) / 2; \ + } \ + return COSTS_N_INSNS (10); /* worst case */ \ + } \ /* A shift by a big integer takes an extra instruction. */ \ if (GET_CODE (XEXP (X, 1)) == CONST_INT \ && (INTVAL (XEXP (X, 1)) == 16)) \ @@ -1400,6 +1414,10 @@ __transfer_from_trampoline () \ return COSTS_N_INSNS (3); /* lsr #i,dn */ \ break; \ case MULT: \ + if ((GET_CODE (XEXP (X, 0)) == ZERO_EXTEND \ + || GET_CODE (XEXP (X, 0)) == SIGN_EXTEND) \ + && GET_MODE (X) == SImode) \ + return COSTS_N_INSNS (MULW_COST); \ if (GET_MODE (X) == QImode || GET_MODE (X) == HImode) \ return COSTS_N_INSNS (MULW_COST); \ else \ @@ -1409,7 +1427,7 @@ __transfer_from_trampoline () \ case MOD: \ case UMOD: \ if (GET_MODE (X) == QImode || GET_MODE (X) == HImode) \ - return COSTS_N_INSNS (27); /* div.w */ \ + return COSTS_N_INSNS (DIVW_COST); /* div.w */ \ return COSTS_N_INSNS (43); /* div.l */ /* Tell final.c how to eliminate redundant test instructions. */ |