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(operand_subword): Reject cases when BITS_PER_WORD is greater than 

HOST_BITS_PER_INT unless OP is const0_rtx.

From-SVN: r4502
This commit is contained in:
Richard Kenner 1993-05-19 13:13:32 -04:00
parent 7b4d5f42d8
commit 2d4f57f838
1 changed files with 9 additions and 8 deletions
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17
gcc/emit-rtl.c
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@ -1,5 +1,5 @@
/* Emit RTL for the GNU C-Compiler expander.
Copyright (C) 1987, 1988, 1992 Free Software Foundation, Inc.
Copyright (C) 1987, 1988, 1992, 1993 Free Software Foundation, Inc.
This file is part of GNU CC.
@ -995,15 +995,16 @@ operand_subword (op, i, validate_address, mode)
Convert to proper endianness now since these cases need it.
At this point, i == 0 means the low-order word.
Note that it must be that BITS_PER_WORD <= HOST_BITS_PER_INT.
This is because if it were greater, it could only have been two
times greater since we do not support making wider constants. In
that case, it MODE would have already been the proper size and
it would have been handled above. This means we do not have to
worry about the case where we would be returning a CONST_DOUBLE. */
We do not want to handle the case when BITS_PER_WORD <= HOST_BITS_PER_INT
in general. However, if OP is (const_int 0), we can just return
it for any word. */
if (op == const0_rtx)
return op;
if (GET_MODE_CLASS (mode) != MODE_INT
|| (GET_CODE (op) != CONST_INT && GET_CODE (op) != CONST_DOUBLE))
|| (GET_CODE (op) != CONST_INT && GET_CODE (op) != CONST_DOUBLE)
|| BITS_PER_WORD > HOST_BITS_PER_INT)
return 0;
if (WORDS_BIG_ENDIAN)