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calls.c (expand_call): Use bitfield instructions to extract/deposit word sized hunks when... 

* calls.c (expand_call): Use bitfield instructions to extract/deposit
        word sized hunks when loading unaligned args into registers.

From-SVN: r22008
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Jeffrey A Law 1998-08-26 17:06:03 +00:00 committed by Jeff Law
parent cc1f775259
commit 425c08a151
2 changed files with 17 additions and 20 deletions
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3
gcc/ChangeLog
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@ -14,6 +14,9 @@ Wed Aug 26 09:30:59 1998 Nick Clifton <nickc@cygnus.com>
Wed Aug 26 12:57:09 1998 Jeffrey A Law (law@cygnus.com)
* calls.c (expand_call): Use bitfield instructions to extract/deposit
word sized hunks when loading unaligned args into registers.
* haifa-sched.c (sched_analyze_insn): Only create scheduling
barriers for LOOP, EH and SETJMP notes on the loop_notes list.

34
gcc/calls.c
View File

@ -1800,16 +1800,16 @@ expand_call (exp, target, ignore)
{
rtx reg = gen_reg_rtx (word_mode);
rtx word = operand_subword_force (args[i].value, j, BLKmode);
int bitsize = TYPE_ALIGN (TREE_TYPE (args[i].tree_value));
int bitpos;
int bitsize = MIN (bytes * BITS_PER_UNIT, BITS_PER_WORD);
int bitalign = TYPE_ALIGN (TREE_TYPE (args[i].tree_value));
args[i].aligned_regs[j] = reg;
/* Clobber REG and move each partword into it. Ensure we don't
go past the end of the structure. Note that the loop below
works because we've already verified that padding
and endianness are compatible.
/* There is no need to restrict this code to loading items
in TYPE_ALIGN sized hunks. The bitfield instructions can
load up entire word sized registers efficiently.
??? This may not be needed anymore.
We use to emit a clobber here but that doesn't let later
passes optimize the instructions we emit. By storing 0 into
the register later passes know the first AND to zero out the
@ -1818,20 +1818,14 @@ expand_call (exp, target, ignore)
emit_move_insn (reg, const0_rtx);
for (bitpos = 0;
bitpos < BITS_PER_WORD && bytes > 0;
bitpos += bitsize, bytes -= bitsize / BITS_PER_UNIT)
{
int xbitpos = bitpos + big_endian_correction;
store_bit_field (reg, bitsize, xbitpos, word_mode,
extract_bit_field (word, bitsize, bitpos, 1,
NULL_RTX, word_mode,
word_mode,
bitsize / BITS_PER_UNIT,
BITS_PER_WORD),
bitsize / BITS_PER_UNIT, BITS_PER_WORD);
}
bytes -= bitsize / BITS_PER_UNIT;
store_bit_field (reg, bitsize, big_endian_correction, word_mode,
extract_bit_field (word, bitsize, 0, 1,
NULL_RTX, word_mode,
word_mode,
bitalign / BITS_PER_UNIT,
BITS_PER_WORD),
bitalign / BITS_PER_UNIT, BITS_PER_WORD);
}
}