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Make more use of subreg_offset_from_lsb

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This patch makes use of the subreg_offset_from_lsb function
added by an earlier patch in the SVE series.

2017-08-24  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* combine.c (make_extraction): Use subreg_offset_from_lsb.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>

From-SVN: r251326
This commit is contained in:
Richard Sandiford 2017-08-24 07:47:13 +00:00 committed by Richard Sandiford
parent 973c787584
commit dc0c1e4476
2 changed files with 10 additions and 15 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-08-24 Richard Sandiford <richard.sandiford@linaro.org>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>
* combine.c (make_extraction): Use subreg_offset_from_lsb.
2017-08-23 Daniel Santos <daniel.santos@pobox.com>
* config/i386/i386.h (ix86_frame::stack_realign_allocate_offset):

19
gcc/combine.c
View File

@ -7488,26 +7488,15 @@ make_extraction (machine_mode mode, rtx inner, HOST_WIDE_INT pos,
return a new hard register. */
if (pos || in_dest)
{
HOST_WIDE_INT final_word = pos / BITS_PER_WORD;
if (WORDS_BIG_ENDIAN
&& GET_MODE_SIZE (inner_mode) > UNITS_PER_WORD)
final_word = ((GET_MODE_SIZE (inner_mode)
- GET_MODE_SIZE (tmode))
/ UNITS_PER_WORD) - final_word;
final_word *= UNITS_PER_WORD;
if (BYTES_BIG_ENDIAN &&
GET_MODE_SIZE (inner_mode) > GET_MODE_SIZE (tmode))
final_word += (GET_MODE_SIZE (inner_mode)
- GET_MODE_SIZE (tmode)) % UNITS_PER_WORD;
unsigned int offset
= subreg_offset_from_lsb (tmode, inner_mode, pos);
/* Avoid creating invalid subregs, for example when
simplifying (x>>32)&255. */
if (!validate_subreg (tmode, inner_mode, inner, final_word))
if (!validate_subreg (tmode, inner_mode, inner, offset))
return NULL_RTX;
new_rtx = gen_rtx_SUBREG (tmode, inner, final_word);
new_rtx = gen_rtx_SUBREG (tmode, inner, offset);
}
else
new_rtx = gen_lowpart (tmode, inner);