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* expmed.c (extract_bit_field): Don't create invalid SUBREGs. 

From-SVN: r47196
This commit is contained in:
Geoffrey Keating 2001-11-20 04:12:11 +00:00 committed by Geoffrey Keating
parent 34806eda30
commit e98f90d363
2 changed files with 17 additions and 8 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2001-11-19 Geoffrey Keating <geoffk@redhat.com>
* expmed.c (extract_bit_field): Don't create invalid SUBREGs.
2001-11-19 Zack Weinberg <zack@codesourcery.com>
* mkconfig.sh: Undefine ENABLE_NLS if GENERATOR_FILE is

21
gcc/expmed.c
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@ -998,6 +998,8 @@ extract_bit_field (str_rtx, bitsize, bitnum, unsignedp,
enum machine_mode int_mode;
enum machine_mode extv_mode = mode_for_extraction (EP_extv, 0);
enum machine_mode extzv_mode = mode_for_extraction (EP_extzv, 0);
enum machine_mode mode1;
int byte_offset;
/* Discount the part of the structure before the desired byte.
We need to know how many bytes are safe to reference after it. */
@ -1071,9 +1073,18 @@ extract_bit_field (str_rtx, bitsize, bitnum, unsignedp,
So too extracting a subword value in
the least significant part of the register. */
byte_offset = (bitnum % BITS_PER_WORD) / BITS_PER_UNIT
+ (offset * UNITS_PER_WORD);
mode1 = (VECTOR_MODE_P (tmode)
? mode
: mode_for_size (bitsize, GET_MODE_CLASS (tmode), 0));
if (((GET_CODE (op0) != MEM
&& TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
GET_MODE_BITSIZE (GET_MODE (op0))))
GET_MODE_BITSIZE (GET_MODE (op0)))
&& GET_MODE_SIZE (mode1) != 0
&& byte_offset % GET_MODE_SIZE (mode1) == 0)
|| (GET_CODE (op0) == MEM
&& (! SLOW_UNALIGNED_ACCESS (mode, MEM_ALIGN (op0))
|| (offset * BITS_PER_UNIT % bitsize == 0
@ -1089,10 +1100,6 @@ extract_bit_field (str_rtx, bitsize, bitnum, unsignedp,
? bitpos + bitsize == BITS_PER_WORD
: bitpos == 0))))
{
enum machine_mode mode1
= (VECTOR_MODE_P (tmode) ? mode
: mode_for_size (bitsize, GET_MODE_CLASS (tmode), 0));
if (mode1 != GET_MODE (op0))
{
if (GET_CODE (op0) == SUBREG)
@ -1108,9 +1115,7 @@ extract_bit_field (str_rtx, bitsize, bitnum, unsignedp,
abort ();
}
if (GET_CODE (op0) == REG)
op0 = gen_rtx_SUBREG (mode1, op0,
(bitnum % BITS_PER_WORD) / BITS_PER_UNIT
+ (offset * UNITS_PER_WORD));
op0 = gen_rtx_SUBREG (mode1, op0, byte_offset);
else
op0 = adjust_address (op0, mode1, offset);
}