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Get the right COST for a SUBREG when truncating 

From-SVN: r13549
This commit is contained in:
Ian Lance Taylor 1997-01-23 20:05:52 +00:00
parent 26bbb20697
commit 38734e55b3
1 changed files with 19 additions and 7 deletions
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26
gcc/cse.c
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@ -1,5 +1,5 @@
/* Common subexpression elimination for GNU compiler.
Copyright (C) 1987, 88, 89, 92-5, 1996 Free Software Foundation, Inc.
Copyright (C) 1987, 88, 89, 92-6, 1997 Free Software Foundation, Inc.
This file is part of GNU CC.
@ -478,12 +478,24 @@ struct table_elt
((REG_USERVAR_P (N) && REGNO (N) < FIRST_PSEUDO_REGISTER) \
|| CHEAP_REGNO (REGNO (N)))
#define COST(X) \
(GET_CODE (X) == REG \
? (CHEAP_REG (X) ? 0 \
: REGNO (X) >= FIRST_PSEUDO_REGISTER ? 1 \
: 2) \
: rtx_cost (X, SET) * 2)
#define COST(X) \
(GET_CODE (X) == REG \
? (CHEAP_REG (X) ? 0 \
: REGNO (X) >= FIRST_PSEUDO_REGISTER ? 1 \
: 2) \
: ((GET_CODE (X) == SUBREG \
&& GET_CODE (SUBREG_REG (X)) == REG \
&& GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \
&& GET_MODE_CLASS (GET_MODE (SUBREG_REG (X))) == MODE_INT \
&& (GET_MODE_SIZE (GET_MODE (X)) \
< GET_MODE_SIZE (GET_MODE (SUBREG_REG (X)))) \
&& subreg_lowpart_p (X) \
&& TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (GET_MODE (X)), \
GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (X))))) \
? (CHEAP_REG (SUBREG_REG (X)) ? 0 \
: REGNO (SUBREG_REG (X)) >= FIRST_PSEUDO_REGISTER ? 1 \
: 2) \
: rtx_cost (X, SET) * 2))
/* Determine if the quantity number for register X represents a valid index
into the `qty_...' variables. */